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LPF-Control PCB TX Logic at U3 & U7

 

I am not getting RF out to the 20Wt PA.? The RF comes in to J3 on the LPF-Cntl PCB, but the logic is such that RFC is connected to RF1.? The RF never gets to J7 (TO 20W PA).? The logic of TX_BPF_SEL is putting a high on pin 6 of U3 and U7 and low on pin 4.? According to the truth table this connects RFC (P5) to RF1 (P1).? Am I missing something?? Could I use the RX_BPF_SEL instead of TX_BPF_SEL to control U3 and U7?
?
The amp works fine if I connect J15 (TO BPF) to the amp input.
?
dave, n3ds
Re: CAT

 

Whose code is this?

Jack, W8TEE

On Thursday, March 6, 2025 at 10:32:43 AM EST, Roger E Critchlow Jr <rec@...> wrote:


Well, it was worse than I remembered, and worse than when keithsdr?was worked out.

Here's a snippet for Teensyduino-1.59 usb_desc.h hosted insice?arduino-ide-2.3.4.? It replaces the body of the clause guarded by #elif defined(USB_MIDI_AUDIO_SERIAL) so that it grows an additional USB_SERIAL #if defined(HIJACK_USB_MIDI_AUDIO_SERIAL).? I included the bracketing #elif's for orientation.? I compiled an empty sketch with this installed and enabled and the Teensy enumerated two usb serial ports, a usb audio device, and a usb MIDI device.

I couldn't get the menues?to update to add a new device, so I simply hijacked an existing device and installed a new personality.? Select the Serial+MIDI+Audio? device from the arduino-ide Tools > USB type > menu, and on linux I get:

ls -l /dev/{snd,serial}/by-id/*
lrwxrwxrwx 1 root root 13 Feb 21 22:06 /dev/serial/by-id/usb-Teensyduino_MIDI_Audio_Dual_Serial_6213530-if00 -> ../../ttyACM0
lrwxrwxrwx 1 root root 13 Feb 21 22:06 /dev/serial/by-id/usb-Teensyduino_MIDI_Audio_Dual_Serial_6213530-if02 -> ../../ttyACM1
lrwxrwxrwx 1 root root 12 Feb 21 22:06 /dev/snd/by-id/usb-Teensyduino_MIDI_Audio_Dual_Serial_6213530-04 -> ../controlC1

-- 73 -- rec -- ad5dz --

-------------------------------------------------------------------------
#elif defined(USB_MIDI_AUDIO_SERIAL)
#define HIJACK_USB_MIDI_AUDIO_SERIAL
#if defined(HIJACK_USB_MIDI_AUDIO_SERIAL)
? #define VENDOR_ID 0x16C0
? #define PRODUCT_ID 0x048A
? #define MANUFACTURER_NAME {'T','e','e','n','s','y','d','u','i','n','o'}
? #define MANUFACTURER_NAME_LEN 11
? #define PRODUCT_NAME {'M','I','D','I','/','A','u','d','i','o','/','D','u','a','l',' ','S','e','r','i','a','l'}
? #define PRODUCT_NAME_LEN 22
? #define EP0_SIZE 64becomes
? #define NUM_ENDPOINTS ? ? ? ? 8 // 6 -> 8
? #define NUM_INTERFACE 8 // 6 -> 8
? #define CDC_IAD_DESCRIPTOR 1
// Serial
? #define CDC_STATUS_INTERFACE 0
? #define CDC_DATA_INTERFACE 1
? #define CDC_ACM_ENDPOINT 2
? #define CDC_RX_ENDPOINT ? ? ? 3
? #define CDC_TX_ENDPOINT ? ? ? 3
? #define CDC_ACM_SIZE ? ? ? ? ?16
? #define CDC_RX_SIZE_480 ? ? ? 512
? #define CDC_TX_SIZE_480 ? ? ? 512
? #define CDC_RX_SIZE_12 ? ? ? ?64
? #define CDC_TX_SIZE_12 ? ? ? ?64
? ? ? ?// SerialUSB1
? #define CDC2_STATUS_INTERFACE 2 // inserts 2 interface and 2 endpoints
? #define CDC2_DATA_INTERFACE ? 3
? #define CDC2_ACM_ENDPOINT ? ? 4
? #define CDC2_RX_ENDPOINT ? ? ?5
? #define CDC2_TX_ENDPOINT ? ? ?5
// MIDI - interface moves to 4 from 2
? #define MIDI_INTERFACE ? ? ? ?4 // 2 -> 4
? #define MIDI_NUM_CABLES ? ? ? 1
? #define MIDI_TX_ENDPOINT ? ? ?6 // 4 -> 6
? #define MIDI_TX_SIZE_12 ? ? ? 64
? #define MIDI_TX_SIZE_480 ? ? ?512
? #define MIDI_RX_ENDPOINT ? ? ?6 // 4 -> 6
? #define MIDI_RX_SIZE_12 ? ? ? 64
? #define MIDI_RX_SIZE_480 ? ? ?512
// Audio (uses 3 consecutive interfaces)
? #define AUDIO_INTERFACE 5 // 3 -> 5
? #define AUDIO_TX_ENDPOINT ? ? 7 // 5 -> 7
? #define AUDIO_TX_SIZE ? ? ? ? 180
? #define AUDIO_RX_ENDPOINT ? ? 7 // 5 -> 7
? #define AUDIO_RX_SIZE ? ? ? ? 180
? #define AUDIO_SYNC_ENDPOINT 8 // 6 -> 8

? #define ENDPOINT2_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_INTERRUPT // Serial
? #define ENDPOINT3_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK

? #define ENDPOINT4_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_INTERRUPT // SerialUSB1
? #define ENDPOINT5_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK

? #define ENDPOINT6_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK // MIDI
? #define ENDPOINT7_CONFIG ENDPOINT_RECEIVE_ISOCHRONOUS + ENDPOINT_TRANSMIT_ISOCHRONOUS // Audio
? #define ENDPOINT8_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_ISOCHRONOUS
#else
? #define VENDOR_ID 0x16C0
? #define PRODUCT_ID 0x048A
? #define MANUFACTURER_NAME {'T','e','e','n','s','y','d','u','i','n','o'}
? #define MANUFACTURER_NAME_LEN 11
? #define PRODUCT_NAME {'T','e','e','n','s','y',' ','M','I','D','I','/','A','u','d','i','o'}
? #define PRODUCT_NAME_LEN 17
? #define EP0_SIZE 64
? #define NUM_ENDPOINTS ? ? ? ? 6
? #define NUM_INTERFACE 6
? #define CDC_IAD_DESCRIPTOR 1
? #define CDC_STATUS_INTERFACE 0
? #define CDC_DATA_INTERFACE 1 // Serial
? #define CDC_ACM_ENDPOINT 2
? #define CDC_RX_ENDPOINT ? ? ? 3
? #define CDC_TX_ENDPOINT ? ? ? 3
? #define CDC_ACM_SIZE ? ? ? ? ?16
? #define CDC_RX_SIZE_480 ? ? ? 512
? #define CDC_TX_SIZE_480 ? ? ? 512
? #define CDC_RX_SIZE_12 ? ? ? ?64
? #define CDC_TX_SIZE_12 ? ? ? ?64
? #define MIDI_INTERFACE ? ? ? ?2 // MIDI
? #define MIDI_NUM_CABLES ? ? ? 1
? #define MIDI_TX_ENDPOINT ? ? ?4
? #define MIDI_TX_SIZE_12 ? ? ? 64
? #define MIDI_TX_SIZE_480 ? ? ?512
? #define MIDI_RX_ENDPOINT ? ? ?4
? #define MIDI_RX_SIZE_12 ? ? ? 64
? #define MIDI_RX_SIZE_480 ? ? ?512
? #define AUDIO_INTERFACE 3 // Audio (uses 3 consecutive interfaces)
? #define AUDIO_TX_ENDPOINT ? ? 5
? #define AUDIO_TX_SIZE ? ? ? ? 180
? #define AUDIO_RX_ENDPOINT ? ? 5
? #define AUDIO_RX_SIZE ? ? ? ? 180
? #define AUDIO_SYNC_ENDPOINT 6
? #define ENDPOINT2_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_INTERRUPT
? #define ENDPOINT3_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK
? #define ENDPOINT4_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK
? #define ENDPOINT5_CONFIG ENDPOINT_RECEIVE_ISOCHRONOUS + ENDPOINT_TRANSMIT_ISOCHRONOUS
? #define ENDPOINT6_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_ISOCHRONOUS
#endif
?
#elif defined(USB_MIDI16_AUDIO_SERIAL)
-----------------------------------------------------------------------------


--
Jack, W8TEE
Re: CAT

 

Well, it was worse than I remembered, and worse than when keithsdr?was worked out.

Here's a snippet for Teensyduino-1.59 usb_desc.h hosted insice?arduino-ide-2.3.4.? It replaces the body of the clause guarded by #elif defined(USB_MIDI_AUDIO_SERIAL) so that it grows an additional USB_SERIAL #if defined(HIJACK_USB_MIDI_AUDIO_SERIAL).? I included the bracketing #elif's for orientation.? I compiled an empty sketch with this installed and enabled and the Teensy enumerated two usb serial ports, a usb audio device, and a usb MIDI device.

I couldn't get the menues?to update to add a new device, so I simply hijacked an existing device and installed a new personality.? Select the Serial+MIDI+Audio? device from the arduino-ide Tools > USB type > menu, and on linux I get:

ls -l /dev/{snd,serial}/by-id/*
lrwxrwxrwx 1 root root 13 Feb 21 22:06 /dev/serial/by-id/usb-Teensyduino_MIDI_Audio_Dual_Serial_6213530-if00 -> ../../ttyACM0
lrwxrwxrwx 1 root root 13 Feb 21 22:06 /dev/serial/by-id/usb-Teensyduino_MIDI_Audio_Dual_Serial_6213530-if02 -> ../../ttyACM1
lrwxrwxrwx 1 root root 12 Feb 21 22:06 /dev/snd/by-id/usb-Teensyduino_MIDI_Audio_Dual_Serial_6213530-04 -> ../controlC1

-- 73 -- rec -- ad5dz --

-------------------------------------------------------------------------
#elif defined(USB_MIDI_AUDIO_SERIAL)
#define HIJACK_USB_MIDI_AUDIO_SERIAL
#if defined(HIJACK_USB_MIDI_AUDIO_SERIAL)
? #define VENDOR_ID 0x16C0
? #define PRODUCT_ID 0x048A
? #define MANUFACTURER_NAME {'T','e','e','n','s','y','d','u','i','n','o'}
? #define MANUFACTURER_NAME_LEN 11
? #define PRODUCT_NAME {'M','I','D','I','/','A','u','d','i','o','/','D','u','a','l',' ','S','e','r','i','a','l'}
? #define PRODUCT_NAME_LEN 22
? #define EP0_SIZE 64becomes
? #define NUM_ENDPOINTS ? ? ? ? 8 // 6 -> 8
? #define NUM_INTERFACE 8 // 6 -> 8
? #define CDC_IAD_DESCRIPTOR 1
// Serial
? #define CDC_STATUS_INTERFACE 0
? #define CDC_DATA_INTERFACE 1
? #define CDC_ACM_ENDPOINT 2
? #define CDC_RX_ENDPOINT ? ? ? 3
? #define CDC_TX_ENDPOINT ? ? ? 3
? #define CDC_ACM_SIZE ? ? ? ? ?16
? #define CDC_RX_SIZE_480 ? ? ? 512
? #define CDC_TX_SIZE_480 ? ? ? 512
? #define CDC_RX_SIZE_12 ? ? ? ?64
? #define CDC_TX_SIZE_12 ? ? ? ?64
? ? ? ?// SerialUSB1
? #define CDC2_STATUS_INTERFACE 2 // inserts 2 interface and 2 endpoints
? #define CDC2_DATA_INTERFACE ? 3
? #define CDC2_ACM_ENDPOINT ? ? 4
? #define CDC2_RX_ENDPOINT ? ? ?5
? #define CDC2_TX_ENDPOINT ? ? ?5
// MIDI - interface moves to 4 from 2
? #define MIDI_INTERFACE ? ? ? ?4 // 2 -> 4
? #define MIDI_NUM_CABLES ? ? ? 1
? #define MIDI_TX_ENDPOINT ? ? ?6 // 4 -> 6
? #define MIDI_TX_SIZE_12 ? ? ? 64
? #define MIDI_TX_SIZE_480 ? ? ?512
? #define MIDI_RX_ENDPOINT ? ? ?6 // 4 -> 6
? #define MIDI_RX_SIZE_12 ? ? ? 64
? #define MIDI_RX_SIZE_480 ? ? ?512
// Audio (uses 3 consecutive interfaces)
? #define AUDIO_INTERFACE 5 // 3 -> 5
? #define AUDIO_TX_ENDPOINT ? ? 7 // 5 -> 7
? #define AUDIO_TX_SIZE ? ? ? ? 180
? #define AUDIO_RX_ENDPOINT ? ? 7 // 5 -> 7
? #define AUDIO_RX_SIZE ? ? ? ? 180
? #define AUDIO_SYNC_ENDPOINT 8 // 6 -> 8

? #define ENDPOINT2_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_INTERRUPT // Serial
? #define ENDPOINT3_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK

? #define ENDPOINT4_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_INTERRUPT // SerialUSB1
? #define ENDPOINT5_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK

? #define ENDPOINT6_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK // MIDI
? #define ENDPOINT7_CONFIG ENDPOINT_RECEIVE_ISOCHRONOUS + ENDPOINT_TRANSMIT_ISOCHRONOUS // Audio
? #define ENDPOINT8_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_ISOCHRONOUS
#else
? #define VENDOR_ID 0x16C0
? #define PRODUCT_ID 0x048A
? #define MANUFACTURER_NAME {'T','e','e','n','s','y','d','u','i','n','o'}
? #define MANUFACTURER_NAME_LEN 11
? #define PRODUCT_NAME {'T','e','e','n','s','y',' ','M','I','D','I','/','A','u','d','i','o'}
? #define PRODUCT_NAME_LEN 17
? #define EP0_SIZE 64
? #define NUM_ENDPOINTS ? ? ? ? 6
? #define NUM_INTERFACE 6
? #define CDC_IAD_DESCRIPTOR 1
? #define CDC_STATUS_INTERFACE 0
? #define CDC_DATA_INTERFACE 1 // Serial
? #define CDC_ACM_ENDPOINT 2
? #define CDC_RX_ENDPOINT ? ? ? 3
? #define CDC_TX_ENDPOINT ? ? ? 3
? #define CDC_ACM_SIZE ? ? ? ? ?16
? #define CDC_RX_SIZE_480 ? ? ? 512
? #define CDC_TX_SIZE_480 ? ? ? 512
? #define CDC_RX_SIZE_12 ? ? ? ?64
? #define CDC_TX_SIZE_12 ? ? ? ?64
? #define MIDI_INTERFACE ? ? ? ?2 // MIDI
? #define MIDI_NUM_CABLES ? ? ? 1
? #define MIDI_TX_ENDPOINT ? ? ?4
? #define MIDI_TX_SIZE_12 ? ? ? 64
? #define MIDI_TX_SIZE_480 ? ? ?512
? #define MIDI_RX_ENDPOINT ? ? ?4
? #define MIDI_RX_SIZE_12 ? ? ? 64
? #define MIDI_RX_SIZE_480 ? ? ?512
? #define AUDIO_INTERFACE 3 // Audio (uses 3 consecutive interfaces)
? #define AUDIO_TX_ENDPOINT ? ? 5
? #define AUDIO_TX_SIZE ? ? ? ? 180
? #define AUDIO_RX_ENDPOINT ? ? 5
? #define AUDIO_RX_SIZE ? ? ? ? 180
? #define AUDIO_SYNC_ENDPOINT 6
? #define ENDPOINT2_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_INTERRUPT
? #define ENDPOINT3_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK
? #define ENDPOINT4_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK
? #define ENDPOINT5_CONFIG ENDPOINT_RECEIVE_ISOCHRONOUS + ENDPOINT_TRANSMIT_ISOCHRONOUS
? #define ENDPOINT6_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_ISOCHRONOUS
#endif
?
#elif defined(USB_MIDI16_AUDIO_SERIAL)
-----------------------------------------------------------------------------
Re: Excessive Noise

 

I was dealing with the same problem. With only the Main board installed I was getting a lot of noise out of the speaker and on the spectrum display. Re-seating the PCM1808 and the PCM5102 didn't help so yesterday I changed them both ... total silence.
Re: T41 Spreading the word

 

Thanks, Rocco...nice writeup om the T41!

Jack, W8TEE

On Monday, March 3, 2025 at 08:50:39 PM EST, Rocco F. Barbaro <rbarbarocpa@...> wrote:


Here is the attachment
?
Jack,
?
I recently introduced my cousin, NJ9S, to the T41 project.
He's a member of the INDIANA CW SECTION NET and today
I received the attached net's monthly bulletin.
I thought you'd like it.
?
?
73 Rocco, WJ6U

--
Jack, W8TEE
Re: T41 Spreading the word

 

¿ªÔÆÌåÓý

Here is the attachment
?
Jack,
?
I recently introduced my cousin, NJ9S, to the T41 project.
He's a member of the INDIANA CW SECTION NET and today
I received the attached net's monthly bulletin.
I thought you'd like it.
?
?
73 Rocco, WJ6U

MARCH 2025 QIN Bulletin for the INDIANA CW SECTION NET of the ARRL National Traffic System.pdf
MARCH 2025 QIN Bulletin for the INDIANA CW SECTION NET of the ARRL National Traffic System.pdf

Re: T41 Spreading the Word

 

No attachment?

Jack, W8TEE

On Monday, March 3, 2025 at 08:46:38 PM EST, Rocco F. Barbaro <rbarbarocpa@...> wrote:


Jack,
?
I recently introduced my cousin, NJ9S, to the T41 project.
He's a member of the INDIANA CW SECTION NET and today
I received the attached net's monthly bulletin.
I thought you'd like it.
?
?
73 Rocco, WJ6U

--
Jack, W8TEE
Re: T41 Spreading the Word

 

¿ªÔÆÌåÓý

Jack,
?
I recently introduced my cousin, NJ9S, to the T41 project.
He's a member of the INDIANA CW SECTION NET and today
I received the attached net's monthly bulletin.
I thought you'd like it.
?
?
73 Rocco, WJ6U
Re: Flex 6400 for sale

 

Never used to be that way. I got taken twice at Dayton once a guy bought a nice Mobile Rig that was pristine came back an hour later said it was DOA.
When I took it home he had hooked it up backwards.
Another time I sold a nice fully loaded HF rig, guy came back said he had an emergency and needed money back.?
When I got home the rig had been gutted!?
Very sad you can't trust anyone these days.
Tim W4YN
Re: Flex 6400 for sale

 

On 2025-03-02 13:41, jjpurdum via groups.io wrote:
All:
Unfortunately, there are people out there
who take delivery of equipment, strip out key parts, and then try to
return it.
*** And THAT's why I'm not selling any of my equipment on Ebay- even though
one gets the best prices there. I have a shed with rigs & test
equipment that I don't use, and a closet with more. And even more in the
garage.

Well, it's also a lot of work to sell stuff. Put up the ad, talk to people
about it, get offers, agree on something - figure out how to pack it and ship it...

I might sell at one of the local ham swaps. Not the same pricing power as Ebay, but
so much simpler. Show up, somebody hands you the cash, you hand him the rig.

There used to be a local store where you could put stuff on consignment. It was
called "HRO". Sadly, they have abandoned us. They closed both of their SF Bay Area
stores. They still have a store in Sacramento, but that's too far to drive.

- Jerry, KF6VB
Re: Bill's SSB Contest Station 28.452

 

That would or could have been Dr. Bill's contest station.
Tim W4YN
Flex 6400 for sale

 

All:

I'm selling my one-owner (me), smokeless environment, Flex 6400, mainly because I rarely use it. All my activity lately is QRP, even though I still have an old FT891 if I need more power than 20 or less watts. It's three years old, but probably has less than 20 hours on it. It's in mint shape with no scratches or dents. I include the Flex 6400, the mic, an Anderson Power Pole cable, and I'll put the software on a flash drive. I never saw the need to update the software, so that's all original, too.

I prefer a pick-up deal and am willing to drive up to 100 miles from Cincinnati to deliver it. Unfortunately, there are people out there who take delivery of equipment, strip out key parts, and then try to return it. As a result, this a cash-only deal with no returns. I realize that sounds harsh, but I got burned a few years back. As for me, I'm too easy to find to try and screw anyone over. The price is $1750, delivered. If someone wants to buy outside that radius, the buyer pays shipping and insurance charges.

Interested parties should contact me at jjpurdum at yahoo dot com.

Jack, W8TEE

--
Jack, W8TEE
Re: Bill's SSB Contest Station 28.452

 

The op said they are also on 21.446.
?
--
73 Greg KF5N
Bill's SSB Contest Station 28.452

 
Edited

Just worked St Lucia on 10M with my T41, the signal is hammering in to south Florida. I used an MFJ loop antenna, so my radiated power was probably on the order of 1 watt.
The contest station call is J62K.
?
--
73 Greg KF5N
T41 transmit died

 

So - I was trying to break in to one of those endless 40M roundtables. They weren't hearing me.
Even with the amp. Looked over at the power meter - zero output! Huh?

Switched to CW, hit the key - normal output.

Stuck my oscilloscope on the IQ inputs to the RF card - no talky-waveform. OH, no! Did something break?
Do I have to do hardware troubleshooting? Waah!

Nope, I don't. The problem is the transmit equalizer. For some reason, if you turn it on, it sets all the bands to zero. Set them up properly, go back to transmit...and they're zero again.

Guess I'll upload Al's latest and see how that does.

WRT equalization: I'd like to have a couple quick-modes for that: "Ragchew mode" - nice flat response,
mellow lows - and DX/Contest mode - lows suppressed, mid-highs accentuated for punch. Maybe I'll code
something.

- Jerry, KF6VB
Re: Feedback into T41

 

It seems that for local 40M daytime chatter, the EFHW kicks the vertical's butt.
To the tune of 3 or 4 S units reported.

- Jerry, KF6VB

On 2025-03-01 15:49, jerry-KF6VB wrote:
OK, it's fixed.
I had a gigantic 31-mix core that I'd been saving for a rainy day. FT400-31.
Ordered some RG400 to make a choke, but looking at that core - I figured I
could do it with RG-8. And so I did. 12 turns. Took some real pulling and
grabbing.
No more feedback.
- Jerry, KF6VB
On 2025-02-28 16:56, K9HZ wrote:
Thats what line feed chokes are specifically made for. One on each
end of the feedline.
DR. WILLIAM J. SCHMIDT - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ
Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
Owner ¨C Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
email: bill@...

On Feb 28, 2025, at 5:59?PM, Larry Acklin via groups.io
<acklin@...> wrote:
?
I used to have issues with my FT901 like that, CW would stick in
transmit- RF in the shack. A ferrite slug with 6 wraps of the
shielded CW key lead after it left the external keyer fixed it.
My EFHW starts at 30 ft and slopes to 10, counterpoise drops to 6 ft
and runs along roughly the same route. 40, 20, 15, 10 all acceptable
SWR. 49:1 balun feeds coax to the radio.
Larry
KB3CUF
On Fri, Feb 28, 2025 at 2:57?PM jerry-KF6VB via groups.io [1]
<jerry@...> wrote:

Hello all,
I was trying out my station with a second antenna - an 65-foot
End
Fed Half Wave. I had built it to the kilowatt level, with a big
toroid
core on the matching transformer. Instead of a counterpoise, I
used an
8-foot ground rod - the kind they sell to ground your house.
Probably needs a counterpoise also...
The far end of the antenna is supported by a monster oak tree
on my
property. Got it up there with a slingshot.
I hooked up a spare MFJ998RT autotuner to the EFHW and thence
to my
station through
a 40-foot length of Davis Buryflex RG/8.
It worked fine on the base T41 - decent SWR on 40, 20 & 15M.
And it
actually worked
on 80 - although the autotuner was clearly struggling.
HOWEVER, when I turned on my KW amp, I pushed the PTT, and the
power
immediately rose to 950W or so out...without me talking. And
somebody
on the frequency said "what's that noise?".
I figure that RF is getting back into the T41.
Probably need to stick a counterpoise on the EFHW, and maybe a
common
mode choke.
My main antenna does not give me any such problems; it's a
trap
vertical up the hill,
and it has an excellent ground - an Ufer ground, consisting of 80
feet
of thick copper wire embedded in a 10 by 70' concrete slab.
I'm trying the EFHW to see if it's any quieter than my
vertical. So
far, it's about the same.
- Jerry, KF6VB
Links:
------
[1]
[2] /g/SoftwareControlledHamRadio/message/33004
[3] /mt/111440976/243852
[4] /g/SoftwareControlledHamRadio/post
[5] /g/SoftwareControlledHamRadio/editsub/243852
[6]
/g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy
Re: Feedback into T41

 

OK, it's fixed.

I had a gigantic 31-mix core that I'd been saving for a rainy day. FT400-31.

Ordered some RG400 to make a choke, but looking at that core - I figured I
could do it with RG-8. And so I did. 12 turns. Took some real pulling and
grabbing.

No more feedback.

- Jerry, KF6VB

On 2025-02-28 16:56, K9HZ wrote:
Thats what line feed chokes are specifically made for. One on each
end of the feedline.
DR. WILLIAM J. SCHMIDT - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ
Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
Owner ¨C Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
email: bill@...

On Feb 28, 2025, at 5:59?PM, Larry Acklin via groups.io
<acklin@...> wrote:
?
I used to have issues with my FT901 like that, CW would stick in
transmit- RF in the shack. A ferrite slug with 6 wraps of the
shielded CW key lead after it left the external keyer fixed it.
My EFHW starts at 30 ft and slopes to 10, counterpoise drops to 6 ft
and runs along roughly the same route. 40, 20, 15, 10 all acceptable
SWR. 49:1 balun feeds coax to the radio.
Larry
KB3CUF
On Fri, Feb 28, 2025 at 2:57?PM jerry-KF6VB via groups.io [1]
<jerry@...> wrote:

Hello all,
I was trying out my station with a second antenna - an 65-foot
End
Fed Half Wave. I had built it to the kilowatt level, with a big
toroid
core on the matching transformer. Instead of a counterpoise, I
used an
8-foot ground rod - the kind they sell to ground your house.
Probably needs a counterpoise also...
The far end of the antenna is supported by a monster oak tree
on my
property. Got it up there with a slingshot.
I hooked up a spare MFJ998RT autotuner to the EFHW and thence
to my
station through
a 40-foot length of Davis Buryflex RG/8.
It worked fine on the base T41 - decent SWR on 40, 20 & 15M.
And it
actually worked
on 80 - although the autotuner was clearly struggling.
HOWEVER, when I turned on my KW amp, I pushed the PTT, and the
power
immediately rose to 950W or so out...without me talking. And
somebody
on the frequency said "what's that noise?".
I figure that RF is getting back into the T41.
Probably need to stick a counterpoise on the EFHW, and maybe a
common
mode choke.
My main antenna does not give me any such problems; it's a
trap
vertical up the hill,
and it has an excellent ground - an Ufer ground, consisting of 80
feet
of thick copper wire embedded in a 10 by 70' concrete slab.
I'm trying the EFHW to see if it's any quieter than my
vertical. So
far, it's about the same.
- Jerry, KF6VB
Links:
------
[1]
[2] /g/SoftwareControlledHamRadio/message/33004
[3] /mt/111440976/243852
[4] /g/SoftwareControlledHamRadio/post
[5] /g/SoftwareControlledHamRadio/editsub/243852
[6]
/g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy
Re: [AmateurRadioBuilders] RP Pico 2

 

There is now a 8/16bit parallel?library available for the RA8876 displays and accompanying lib for the capacitive touchscreen controller. Was toying with the idea of a twin teensy setup, one dedicated to the display and one for the DSP work, data xfer between the?two would be over ethernet as it offers high speed and the 16bit connection consumes a lot of the pins on the teensy connected to the display.

Might be a good way to get around memory limitations and you could still use a pico pi connected to the DSP teensy to handle the I/O stuff and provide WiFi connectivity which in turn opens up all sorts of possibilities for integration with online API's.Now that we have decent code build to work with I might try to do some testing over the next while to see if I can get this setup to work. Already have the display working with a parallel?connection just need to determine how well firing the waterfall array data across the ethernet works and it doesn't mess up the audio on the DSP teensy. It will be an interesting experiment!


On Fri, 28 Feb 2025 at 17:16, jjpurdum via <jjpurdum=[email protected]> wrote:
You didn't read what I said. Each "page" (your term, not mine) is a segment of the display and only that gets updated.

Jack, W8TEE

On Friday, February 28, 2025 at 12:13:08 PM EST, jerry-KF6VB <jerry@...> wrote:


On 2025-02-28 08:46, jjpurdum via wrote:
> I think the Teensy could work with only 3 function calls to the Pico
> (or whatever??) processor for each page:

*** It should be more granular than that.? If a new S-meter reading
comes in,
the Pico shouldn't have to update the entire display.

? ? ? ? ? ? ? - Jerry,KF6VB






--
Jack, W8TEE

Re: Feedback into T41

 

¿ªÔÆÌåÓý

Thats what line feed chokes are specifically made for. ?One on each end of the feedline. ?


Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

?

Owner - Operator

Big Signal Ranch ¨C K9ZC

Staunton, Illinois

?

Owner ¨C Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:??bill@...

?


On Feb 28, 2025, at 5:59?PM, Larry Acklin via groups.io <acklin@...> wrote:

?
I used to have issues with my FT901 like that, CW would stick in transmit- RF in the shack. A ferrite slug with 6 wraps of the shielded?CW key lead after it left the external keyer fixed it.?

My EFHW starts at 30 ft and slopes to 10, counterpoise drops to 6 ft and runs along roughly the same route. 40, 20, 15, 10 all acceptable SWR. 49:1 balun feeds coax to the radio.?

Larry
KB3CUF?

On Fri, Feb 28, 2025 at 2:57?PM jerry-KF6VB via <jerry=[email protected]> wrote:
Hello all,

? ? I was trying out my station with a second antenna - an 65-foot End
Fed Half Wave.? I had built it to the kilowatt level, with a big toroid
core on the matching transformer.? Instead of a counterpoise, I used an
8-foot ground rod - the kind they sell to ground your house.
Probably needs a counterpoise also...

? ?The far end of the antenna is supported by a monster oak tree on my
property.? Got it up there with a slingshot.

? ? I hooked up a spare MFJ998RT autotuner to the EFHW and thence to my
station through
a 40-foot length of Davis Buryflex RG/8.

? ? It worked fine on the base T41 - decent SWR on 40, 20 & 15M.? And it
actually worked
on 80 - although the autotuner was clearly struggling.

? ?HOWEVER, when I turned on my KW amp, I pushed the PTT, and the power
immediately rose to 950W or so out...without me talking.? And somebody
on the frequency said "what's that noise?".

? ?I figure that RF is getting back into the T41.

? ?Probably need to stick a counterpoise on the EFHW, and maybe a common
mode choke.

? ?My main antenna does not give me any such problems;? it's a trap
vertical up the hill,
and it has an excellent ground - an Ufer ground, consisting of 80 feet
of thick copper wire embedded in a 10 by 70' concrete slab.

? ?I'm trying the EFHW to see if it's any quieter than my vertical.? So
far, it's about the same.

? ? ? ? ? ? ? ? ? ? ? ? - Jerry, KF6VB
Re: Feedback into T41

 

try 1:1 between your tuner and the T41.

Best regards,

Jack Mann
W1QZ


On Fri, Feb 28, 2025 at 4:59?PM Larry Acklin via <acklin=[email protected]> wrote:
I used to have issues with my FT901 like that, CW would stick in transmit- RF in the shack. A ferrite slug with 6 wraps of the shielded?CW key lead after it left the external keyer fixed it.?

My EFHW starts at 30 ft and slopes to 10, counterpoise drops to 6 ft and runs along roughly the same route. 40, 20, 15, 10 all acceptable SWR. 49:1 balun feeds coax to the radio.?

Larry
KB3CUF?

On Fri, Feb 28, 2025 at 2:57?PM jerry-KF6VB via <jerry=[email protected]> wrote:
Hello all,

? ? I was trying out my station with a second antenna - an 65-foot End
Fed Half Wave.? I had built it to the kilowatt level, with a big toroid
core on the matching transformer.? Instead of a counterpoise, I used an
8-foot ground rod - the kind they sell to ground your house.
Probably needs a counterpoise also...

? ?The far end of the antenna is supported by a monster oak tree on my
property.? Got it up there with a slingshot.

? ? I hooked up a spare MFJ998RT autotuner to the EFHW and thence to my
station through
a 40-foot length of Davis Buryflex RG/8.

? ? It worked fine on the base T41 - decent SWR on 40, 20 & 15M.? And it
actually worked
on 80 - although the autotuner was clearly struggling.

? ?HOWEVER, when I turned on my KW amp, I pushed the PTT, and the power
immediately rose to 950W or so out...without me talking.? And somebody
on the frequency said "what's that noise?".

? ?I figure that RF is getting back into the T41.

? ?Probably need to stick a counterpoise on the EFHW, and maybe a common
mode choke.

? ?My main antenna does not give me any such problems;? it's a trap
vertical up the hill,
and it has an excellent ground - an Ufer ground, consisting of 80 feet
of thick copper wire embedded in a 10 by 70' concrete slab.

? ?I'm trying the EFHW to see if it's any quieter than my vertical.? So
far, it's about the same.

? ? ? ? ? ? ? ? ? ? ? ? - Jerry, KF6VB
941 - 960 of 33812