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Re: RA8875 display problems with T4.x - a visual study
¿ªÔÆÌåÓýWell there is no real absolute way its done as you probably know, you first need to determine the noise floor (for the mode) and that is usually the point at which the (S+N)/N = 3db (and of course, its bandwidth sensitive and frequency dependent).? If all you are interested in is the absolute noise floor at a frequency you can do this with a dummy load. ??Then the radio sensitivity is the point 10 db = (S+N)/N.? This is the point at which the signal is 10 db stronger than the receiver noise (Definition for voice comms and there are a couple of ways to do this¡ but most commonly with a signal generator, a good adjustable attenuator).? If you do this in CW with a narrow filter it¡¯s taken to be 3 db.? [I could write a book here but wont] ? For the two V11 and V12 radio display impact, the difference between the display handling stuff is to determine the noise floors for each¡ difference them. ?Its not completely fair but it is representative. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Greg KF5N via groups.io
Sent: Saturday, April 5, 2025 4:25 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] RA8875 display problems with T4.x - a visual study ? Hi Bill, 100 dB relative to what?? How did you measure that? ? -- 73 Greg KF5N |
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Re: Update now available
That was changed...don't know why it wasn't updated. Jack, W8TEE
On Saturday, April 5, 2025 at 03:42:45 PM EDT, K9HZ <bill@...> wrote:
?¡°The latest (V12) PCBs are available for less than $5 each on the web site (/g/SoftwareControlledHamRadio). If you wish, pre-fabricated PCBs with all SMD devices already on the board are available as a semi-kit from 4SQRP (see http://www.4sqrp.com/index.php for details).¡± ? Yikes this is outdated¡ ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Oliver KI3P via groups.io
Sent: Saturday, April 5, 2025 2:31 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Update now available ? I think this is the correct link:
-- Jack, W8TEE |
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Re: Update now available
¿ªÔÆÌåÓý?¡°The latest (V12) PCBs are available for less than $5 each on the web site (/g/SoftwareControlledHamRadio). If you wish, pre-fabricated PCBs with all SMD devices already on the board are available as a semi-kit from 4SQRP (see http://www.4sqrp.com/index.php for details).¡± ? Yikes this is outdated¡ ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Oliver KI3P via groups.io
Sent: Saturday, April 5, 2025 2:31 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Update now available ? I think this is the correct link:
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Re: Update now available
I think this is the correct link: -------- Original Message -------- On 4/5/25 1:04 PM, jjpurdum via groups.io wrote:
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Re: T41 T41EEE.9 Firmware Release
¿ªÔÆÌåÓýAh¡ old fashion Automatic Volume Control (AVC) dated from the old tube radios¡to control the volume of the radio as to not blow out your ear drums¡ ?as opposed to RF Gain (or Automatic Gain Control) that prevents over-driving the snot out of the radio RF circuits (like the front end!) causing flat-topping, distortion, etc.? Someone was using that audio library to do that too (can¡¯t remember who¡ slept since)¡ but it works extremely well as the video shows. ? The uBITx people are using term AGC for AVC. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Greg KF5N via groups.io
Sent: Wednesday, April 2, 2025 7:32 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] T41 T41EEE.9 Firmware Release ? Demo of the new AGC in T41EEE.9: ? ? Compressor2 is part of the Open Audio Library.? Bob's Tiny Ten Transceiver uses it in the audio data path. I tried it, and WOW it works great! ? The Open Audio Library: ? Compressor2 is also used in the transmitter path along with the CESSB module.? Good stuff! ? -- 73 Greg KF5N |
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Re: More testing on PA
¿ªÔÆÌåÓýYeah another mistake is pulling the wire so tight that is scrapes the enamel off the wire between turns and shorts them together.? I am guilty of doing that¡ ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Tim via groups.io
Sent: Saturday, April 5, 2025 12:53 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] More testing on PA ? I can see me messing up those? I will rewind for grins. Tim? |
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Re: [AmateurRadioBuilders] Back in the Saddle
Yeah it does...
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Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. email: bill@... -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of jerry-KF6VB Sent: Saturday, April 5, 2025 12:38 PM To: [email protected] Cc: [email protected] Subject: Re: [SoftwareControlledHamRadio] [AmateurRadioBuilders] Back in the Saddle Doesn't the newer RF board have the solder holes in the middle of the attenuator pads? - Jerry, KF6VB On 2025-04-05 07:13, K9HZ wrote: The only think that has changed on this list is the RF board¡ and that |
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Re: Transmitting noise
¿ªÔÆÌåÓýThat¡¯s not bad¡ there is some low-level noise on the signal at about 400 hz and I wonder what that is? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Oliver KI3P via groups.io
Sent: Saturday, April 5, 2025 9:44 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Transmitting noise ? ? The frequency calibration of my HackRF One is a little bit off, but here's what the audio sounds like from my radio (see attached WAV file). I haven't done anything to try to improve the mic. On Saturday, April 5th, 2025 at 10:32 AM, Oliver KI3P via groups.io <oliver@...> wrote:
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FW: [SoftwareControlledHamRadio] boards and kits and stuff
¿ªÔÆÌåÓýJohn¡ This is good work.? ? I just ordered the parts for the Display Driver kits after I got good reports from 4 of the 5 kits I sent out for people to try.? The parts for the remainder of the Drivers should be here by Tuesday.? I¡¯ll send you one when the parts get here. ? My goal is to generate a PCB type box to put over the display to keep the RFI down to a minimum.? If you can help me design those boxes for the % and 7 inch displays, I¡¯ll have some made and send you a couple to try out.? As you know, his makes a HUGE difference in the usable floor and weak signal reception/ sensitivity of the receiver. ? Also interested in any help from the readers of this to get this right the first time. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of John V Lundberg via groups.io
Sent: Wednesday, March 19, 2025 1:52 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff ? I am interested in getting a 3.3 V board to see if it will further improve the receive noise on 6M by reducing radiation from the cable between the Main and Display boards. I have an AI6YM chassis with V12 Main, RF, and Front Panel boards. I use a 5" display in a shielded enclosure which greatly improved the RX noise floor on 80M through 10M (see the attachment). John W2TX |
K9HZ
jjpurdum