|
Re: More testing on PA
¿ªÔÆÌåÓýYeah, that¡¯s what mine looks like too. ??Glad you found the issue.? ?I¡¯ve sold over 1,000 of those PA semi-kits now and I¡¯ve only had three people have issues since I started selling them.? One was a power lead reversal (YIKES)¡ Its pretty simple¡ not much to go wrong. ? One thing on my to-do list is to put together a list of test points with voltages and wave forms for all of the T41 boards¡ and my/ mine and Olivers boards and kits.? So many things to do and never enough 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 Tim via groups.io
Sent: Sunday, April 6, 2025 3:14 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] More testing on PA ? I rewound t1,2 and 3. Tested between each rewind, tuned out T3 was culprit, easiest to wind! Not sure what it was ,I may have had a solder bridge across C25 which on revised board is right next to center tap pad. I would suggest moving that if you revise board. Seems very easy to bridge when soldering center tap windings. 100pF across primary, 7 turns on L2 (enamel wire). I may play a bit with cap across primary but it looks so much nicer now I may just leave it alone! Tim? |
|
Re: More testing on PA
I rewound t1,2 and 3. Tested between each rewind, tuned out T3 was culprit, easiest to wind! Not sure what it was ,I may have had a solder bridge across C25 which on revised board is right next to center tap pad. I would suggest moving that if you revise board. Seems very easy to bridge when soldering center tap windings.
100pF across primary, 7 turns on L2 (enamel wire).
I may play a bit with cap across primary but it looks so much nicer now I may just leave it alone!
Tim?
|
|
Boards and Kits
¿ªÔÆÌåÓýI¡¯m back for a while and working on kits again.? I put a very high priority on the new Display Driver board that fixes the T41 display freeze issue and allows a nice long cable to the display.? I offer a 3.3V ONLY kit and a 3.3V and 5V kit (until I run out of 3.3V kits¡ then I will only stock the combo 3.3V and 5V kit).? ??I¡¯m still writing the assembly manual for the display kits but it should be done by this afternoon.? I will order the last few parts for them today¡ I should have them by Tuesday and will begin shipping them then.? Also new to the list is the 20W Dummy Load/ 40 db attenuator tap for the calibration steps.? I¡¯ve attached the full list so you can look it over if you need something.?? Those boards and Kits with $0.00 are not in stock.? Remember, don¡¯t send me money, I¡¯ll invoice you¡ and make SURE you include your address.? All prices below are without shipping, taxes, and Paypal fee.? ? I will be at FDIM Thursday night¡ and have a booth at Hamvention (Booth 4111 in Building 4) where we will have a special guest¡ Al Peter to show off the T41 and answer any questions.? I will be selling boards and kits both places and you won¡¯t have to pay shipping on them if you carry them away. ? Respond via my private email bill@... as to not clog the space here with our transactions. ? ? ? ? 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@... ? ? |
|
Re: Updated book; not available on amazon uk
I don't know how long it takes for US changes to ripple through the system. I would write Amazon.UK and try to get an answer. Jack, W8TEE
On Sunday, April 6, 2025 at 12:24:14 PM EDT, Gareth Evans via groups.io <headstone255@...> wrote:
As per title -- Jack, W8TEE |
|
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 |
|
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 |
|
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:
|
|
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:
|
|
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 |
|
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? |
|
Re: [AmateurRadioBuilders] Back in the Saddle
Yeah it does...
toggle quoted message
Show quoted text
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 |
K9HZ
jjpurdum