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Mike Black W9MDB SK

 

Even if you don't know who Mike is, you know his work.? Mike was a key developer of hamlib in addition to many, many other contributions to our hobby.? I only had the privilege of a few email exchanges with him but you would be hard pressed to find a kinder, more helpful ham anywhere.
?
https://dukerandhaugh.com/obituaries/michael-d-black/
Re: More testing on PA

 

Tim,
You plot shows some overdriving at low frequencies of either the Pa or the SA. So either increease the reference level to +20 dBm, or use a 10 dB attenautor at the SA?s input or lower the output of the TG by at least 10 dB.

Henning Weddig DK5LV

Am 31.03.2025 um 21:06 schrieb Tim via groups.io:

I have Dr. Bills PA and a similar (same finals) from 60dbm shop. Both on 13V same 0dB sweep from SA. I attached the 60dBm Schematic for reference.
Here is Dr. Bills with 0dB in
His with -10dB in,
60dbm shop amp 0dBin
Re: Need HELP!!!!

 

to be honest, I would have expected to know which mistake was the cause. It might be helpful for others. mistakes are meant to be learned. If no mistakes are?
made, there is nothing to learn. Again, please share your experience. Mistakes are not shameful.
History teaches us that mistakes have always led to progress. Scientists who didn?t share their ideas and mistakes have been forgotten.
From a distance it is always difficult to find mistakes, which makes honest feedback all the more important.
I hope I?m not offensive
best regards
Ralph
?
?
?
Re: boards and kits and stuff

 

¿ªÔÆÌåÓý

Thanks Oliver for the link


glenn

vk3pe
Re: Need HELP!!!!

 

The scans checks for the presence of an I2C device at all valid addresses -- if it finds a device at a particular address, it prints a notification to tell you so and continues searching. As you connect more boards to the bus you'll see the scanner find more devices.
Re: Need HELP!!!!

 

I belive it is working. When the I2C Scan starts it finds the audio? hat and then scans a few seconds later and come back on devices found.? Is this correct on how the I2C Scan works, finds one address and looks for another??
?
?
Tom
Re: 4SQRP T41 Assembled/Tested Radio for sale

 

I have received an offer to buy the T41 from K0ESE. I'll mark this as "Funds Pending".
Thanks and 73,
Frank K1FFJ
More testing on PA

 

I have Dr. Bills PA and a similar (same finals) from 60dbm shop. Both on 13V same 0dB sweep from SA. I attached the 60dBm Schematic for reference.
Here is Dr. Bills with 0dB in
His with -10dB in,
60dbm shop amp 0dBin
?
?

Amplifier_3_sch _1_.pdf
Amplifier_3_sch _1_.pdf

Re: QRP-Labs

 

On 2025-03-31 06:30, jjpurdum via groups.io wrote:
That's one thing Hans does right: He doesn't release stuff until he's
convinced it's bullet-proof.
*** Yup. That being said, the QMX+ is back on the shelf, and I'm back
to playing with the T41. Despite being a kit, the QMX is essentially an
appliance - from my point of view. Because it's closed source. For me,
its entertainment value is limited.

Hans has promised some sort of built-in language interpreter, and I
might go back to it when that's a reality.

- Jerry, KF6VB


Jack, W8TEE
On Sunday, March 30, 2025 at 09:30:34 PM EDT, jerry-KF6VB
<jerry@...> wrote:
On 2025-03-30 15:50, Greg KF5N via groups.io wrote:
Did you get a chance to look at the spectrum?
That seems like a lot of power for BS170s!
*** It's a digital PA. In the schematic, the BS170's are fed
RF by LOGIC gates. I think it's what's called a "class E".
They don't even have heat sinks. They output 5W without
breaking a sweat.
The spectrum looks good on my FTDX10. I haven't hooked it up to
a spectrum analyzer yet.
- Jerry, KF6VB

--
73 Greg KF5N
Links:
------
[1] /g/SoftwareControlledHamRadio/message/33305
[2] /mt/111990371/243852
[3] /g/SoftwareControlledHamRadio/post
[4] /g/SoftwareControlledHamRadio/editsub/243852
[5]
/g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy
--
Jack, W8TEE
Links:
------
[1] /g/SoftwareControlledHamRadio/message/33311
[2] /mt/111990371/243852
[3] /g/SoftwareControlledHamRadio/post
[4] /g/SoftwareControlledHamRadio/editsub/243852
[5]
/g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy
Re: 4SQRP T41 Assembled/Tested Radio for sale

 

Sorry forgot the photo:
?

IMG_0327.jpg

4SQRP T41 Assembled/Tested Radio for sale

 

Hello everyone,
I have an assembled, tested and calibrated a T41 from 4SQRP that I built as a comparison to my T41EP that I built from scratch (no kit). I wanted to see if my no kit T41 performed as well as the kit from 4SQRP (which it did!). My T41 for sale has the "built like a tank" 20 watt amplifier from K9HZ. The last firmware that I installed is T41EEE by KF6VB. Of course newer versions of firmware/software have been released which you could upgrade the T41 to. The T41 is excess to my needs and I am hoping that someone who wanted this design but missed the one-time production run from 4SQRP may be interested in buying this completed radio. Please contact me directly if interested via PM or email me to the email listed on QRZ.com.
?
Thanks and 73,
Frank K1FFJ
Re: QRP-Labs

 

That's one thing Hans does right: He doesn't release stuff until he's convinced it's bullet-proof. He had an SSB rig at the 2018 (?) YOTA conference in Africa, so it's not like he hasn't been fooling around with it for a while. He does use Class E in the QCX family, so that wouldn't surprise me. I'm not at all surprised that his update works.

Jack, W8TEE

On Sunday, March 30, 2025 at 09:30:34 PM EDT, jerry-KF6VB <jerry@...> wrote:


On 2025-03-30 15:50, Greg KF5N via groups.io wrote:
> Did you get a chance to look at the spectrum?
> That seems like a lot of power for BS170s!

*** It's a digital PA.? In the schematic, the BS170's are fed
RF by LOGIC gates.? I think it's what's called a "class E".

? They don't even have heat sinks.? They output 5W without
breaking a sweat.

? The spectrum looks good on my FTDX10.? I haven't hooked it up to
a spectrum analyzer yet.

? ? ? ? ? ? ? ? - Jerry, KF6VB






>
> --
> 73 Greg KF5N
>
>
> Links:
> ------
> [1] /g/SoftwareControlledHamRadio/message/33305
> [2] /mt/111990371/243852
> [3] /g/SoftwareControlledHamRadio/post
> [4] /g/SoftwareControlledHamRadio/editsub/243852
> [5]
> /g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy






--
Jack, W8TEE
Re: boards and kits and stuff

 

The schematic is attached to this comment:
?
Re: QRP-Labs

 

On 2025-03-30 18:17, Dave Mueller AA3EE via groups.io wrote:
It is. They become extremely sensitive to load mismatches. The group
is full of reports of them failing, especially when an external tuner
is looking for a match.
*** I guess that's why the radio has a built-in SWR bridge, and fairly
fussy protection software.

Since I'm operating it into my Tiny Linear, the radio is isolated from antenna
SWR. Nobody hears me at 5W, anyway :).

- Jerry, KF6VB
Re: QRP-Labs

 

On 2025-03-30 15:50, Greg KF5N via groups.io wrote:
Did you get a chance to look at the spectrum?
That seems like a lot of power for BS170s!
*** It's a digital PA. In the schematic, the BS170's are fed
RF by LOGIC gates. I think it's what's called a "class E".

They don't even have heat sinks. They output 5W without
breaking a sweat.

The spectrum looks good on my FTDX10. I haven't hooked it up to
a spectrum analyzer yet.

- Jerry, KF6VB






--
73 Greg KF5N
Links:
------
[1] /g/SoftwareControlledHamRadio/message/33305
[2] /mt/111990371/243852
[3] /g/SoftwareControlledHamRadio/post
[4] /g/SoftwareControlledHamRadio/editsub/243852
[5]
/g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy
Re: QRP-Labs

 

It is. They become extremely sensitive to load mismatches. The group is full of reports of them failing, especially when an external tuner is looking for a match.
Dave
Re: boards and kits and stuff

 

¿ªÔÆÌåÓý

Bill
Is there a. Link to sch etc for this little board.?
I don't have any issues with my build and a 6inch cable but then again, not checked the? higher bands.
Glenn?

'72 ISUZU BELLETT SPORT
Sent from my Samsung Galaxy S21 FE Smartphone.
Re: QRP-Labs

 

Did you get a chance to look at the spectrum?
That seems like a lot of power for BS170s!
?
--
73 Greg KF5N
Re: Oscillations on high bands

 

Testing my 20W PA with -10dB in verses? 0dB in I see very little change in gain on lower bands 160-7, some gain on 10-17 and significant (3dB) gain on 28-50 Mhz.?
Max 0dB in is 160-80m is 12W,? 30-20M 9W,? and 10-6M 5W.?
?
Tim?
W4YN
Re: Need HELP!!!!

 

to avoid misunderstandings: 3.3V are only on pin46 with teensy in! Teensy produce this 3.3V by himself! we have ?different rails with 3.3V!
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