No one has made a stencil that I know of.
-------- Original Message -------- On 4/3/25 8:43 PM, John Owens K1JO via groups.io wrote: Thanks Oliver and Bill. I'll have a look at the updated manuals. Is the change on the RF board described, meaning which components not to install for the clock divider circuit.
One other question: I hope to build a reflow oven soon, has anyone produced the solder masks?
Best regards,
John Owens K1JO
|
Thanks Oliver and Bill. I'll have a look at the updated manuals. Is the change on the RF board described, meaning which components not to install for the clock divider circuit.
One other question: I hope to build a reflow oven soon, has anyone produced the solder masks?
Best regards,
John Owens K1JO
|
Hi John, Like Oliver said, not much from a hardware standpoint has changed. ?Mostly software and the assembly manuals that are updated when tweaks make the radio perform better. ?
There are a few new boards and kits to make things easier¡ like an attenuator kit. ?Shortly ill have a display driver hot that makes the display more robust. ? More to come!
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@... ?
toggle quoted message
Show quoted text
On Apr 3, 2025, at 5:55?PM, John Owens K1JO via groups.io <johnowenschina@...> wrote:
? Hi All. I'm trying to get back in gear with the T-41 build. I purchased? 4 full sets of V12.6 boards with dual RF and dual BPF, Tiny 85V, PE4302 chip, and K9HZ 20W 160-6M PA. I got these from Bill K9HZ almost a year ago.? Sadly, I couldn't work on these until now. So, my question is: Have there been any updates to these boards that I need to get and are there updated plans for building them.
Best regards and thanks in advance, John Owens K1JO
|
Hi John,
The assembly manuals are on GitHub here:
There have been updates to the RF board, but you can still use the year-old version -- just don't populate the clock divider circuit as it is no longer necessary.
Cheers, Oliver KI3P
On Thursday, April 3rd, 2025 at 5:55 PM, John Owens K1JO via groups.io <johnowenschina@...> wrote:
Hi All. I'm trying to get back in gear with the T-41 build. I purchased? 4 full sets of V12.6 boards with dual RF and dual BPF, Tiny 85V, PE4302 chip, and K9HZ 20W 160-6M PA. I got these from Bill K9HZ almost a year ago.? Sadly, I couldn't work on these until now. So, my question is: Have there been any updates to these boards that I need to get and are there updated plans for building them.
Best regards and thanks in advance, John Owens K1JO
|
Hi All. I'm trying to get back in gear with the T-41 build. I purchased? 4 full sets of V12.6 boards with dual RF and dual BPF, Tiny 85V, PE4302 chip, and K9HZ 20W 160-6M PA. I got these from Bill K9HZ almost a year ago.? Sadly, I couldn't work on these until now. So, my question is: Have there been any updates to these boards that I need to get and are there updated plans for building them.
Best regards and thanks in advance, John Owens K1JO
|
One thing. ? With the driver board in place, you should be able to jump R4 and R5¡ the buffer resistors on the Main board in the SPI lines. ? Not needed. ?
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@... ?
toggle quoted message
Show quoted text
On Apr 2, 2025, at 10:46?AM, K9HZ <bill@...> wrote:
? Take a picture of the driver board in place on the MAIN board please¡ ? One thing I did that I regret is placing the ¡°U1¡± symbol at the bottom of the IC.? The little white registration dot for PIN 1 is at the bottom right. ? ? 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@... ? ? ? Completed the build for 5V. No shorts, no opens, and all connections traced and ok. However, with the Board in place, no Display. Checked it twice and made sure that both connectors were fully seated. The system still works without it, so no harm. I'll try again later and check some voltages. On 3/31/2025 6:36 AM, Oliver KI3P via groups.io wrote: On Sunday, March 30th, 2025 at 2:47 PM, Robert Luken W3RDL via groups.io <now.w3rdl@...> wrote:
Got it yesterday, heading out to the workshop to build it. May have missed your note on 5v/3.3v. On 3/30/2025 1:55 PM, K9HZ via groups.io wrote: I sent out five of those new display driver boards about a week ago and only saw posted that Terrance got his working as was able to use a 3-foot long display cable without display-T41 errors/lockups. Anyone else built it yet? I know i didnt publish an assembly manual before i headed out of the country but the thing is pretty simple and i did send out a note re how to make it work on 5v or 3.3v. Anyone else? I think its a winner but would like to know so i can get parts and boards ordered to send these out before Hamvention ? 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: ? email: bill@...
-- 73 <image001.gif> Bob W3RDL
?
--
73 <image001.gif> Bob W3RDL
|
Saw that. ?Ots a win!
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@... ?
toggle quoted message
Show quoted text
On Apr 2, 2025, at 6:36?PM, Robert Luken W3RDL via groups.io <now.w3rdl@...> wrote:
?
Did you miss my post that I got it working after reheating the
connector pins. I can also run Ver66.9 at both 600MHz and 528MHz
with TCXO defined.
On 4/2/2025 3:19 PM, K9HZ via groups.io
wrote:
Yep
that¡¯s it and its in the right orientation.? The U1 part
should be on the board 180 degrees from straight up and I
think you have that right too¡.. with pin 1 at the white dot
in the lower right corner¡
?
?
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@...
?
?
?
Bill, is this what you want?
On 4/2/2025 10:46 AM, K9HZ via groups.io
wrote:
Take a
picture of the driver board in place on the MAIN board
please¡
?
One
thing I did that I regret is placing the ¡°U1¡± symbol at
the bottom of the IC.? The little white registration dot
for PIN 1 is at the bottom right.
?
?
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@...
?
?
?
Completed the build for 5V. No shorts, no opens, and all
connections traced and ok. However, with the Board in place,
no Display. Checked it twice and made sure that both
connectors were fully seated. The system still works without
it, so no harm. I'll try again later and check some
voltages.
On 3/31/2025 6:36 AM, Oliver KI3P via
groups.io wrote:
On Sunday, March 30th, 2025 at 2:47
PM, Robert Luken W3RDL via groups.io <now.w3rdl@...>
wrote:
Got it yesterday, heading out to the workshop to
build it. May have missed your note on 5v/3.3v.
On 3/30/2025 1:55 PM, K9HZ via
groups.io wrote:
I sent out five of those new
display driver boards about a week ago and only saw
posted that Terrance got his working as was able to
use a 3-foot long display cable without display-T41
errors/lockups. Anyone else built it yet? I know i
didnt publish an assembly manual before i headed out
of the country but the thing is pretty simple and i
did send out a note re how to make it work on 5v or
3.3v.
Anyone else? I think its a
winner but would like to know so i can get parts
and boards ordered to send these out before
Hamvention
?
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:
?
email: bill@...
--
73 <image001.gif>
Bob W3RDL
?
--
73 <image001.gif>
Bob W3RDL
--
73 <image001.gif>
Bob W3RDL
--
73
<73cw.gif>
Bob W3RDL
|
Did you miss my post that I got it working after reheating the
connector pins. I can also run Ver66.9 at both 600MHz and 528MHz
with TCXO defined.
On 4/2/2025 3:19 PM, K9HZ via groups.io
wrote:
Yep
that¡¯s it and its in the right orientation.? The U1 part
should be on the board 180 degrees from straight up and I
think you have that right too¡.. with pin 1 at the white dot
in the lower right corner¡
?
?
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@...
?
?
?
Bill, is this what you want?
On 4/2/2025 10:46 AM, K9HZ via groups.io
wrote:
Take a
picture of the driver board in place on the MAIN board
please¡
?
One
thing I did that I regret is placing the ¡°U1¡± symbol at
the bottom of the IC.? The little white registration dot
for PIN 1 is at the bottom right.
?
?
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@...
?
?
?
Completed the build for 5V. No shorts, no opens, and all
connections traced and ok. However, with the Board in place,
no Display. Checked it twice and made sure that both
connectors were fully seated. The system still works without
it, so no harm. I'll try again later and check some
voltages.
On 3/31/2025 6:36 AM, Oliver KI3P via
groups.io wrote:
On Sunday, March 30th, 2025 at 2:47
PM, Robert Luken W3RDL via groups.io <now.w3rdl@...>
wrote:
Got it yesterday, heading out to the workshop to
build it. May have missed your note on 5v/3.3v.
On 3/30/2025 1:55 PM, K9HZ via
groups.io wrote:
I sent out five of those new
display driver boards about a week ago and only saw
posted that Terrance got his working as was able to
use a 3-foot long display cable without display-T41
errors/lockups. Anyone else built it yet? I know i
didnt publish an assembly manual before i headed out
of the country but the thing is pretty simple and i
did send out a note re how to make it work on 5v or
3.3v.
Anyone else? I think its a
winner but would like to know so i can get parts
and boards ordered to send these out before
Hamvention
?
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:
?
email: bill@...
--
73 
Bob W3RDL
?
--
73
Bob W3RDL
--
73
Bob W3RDL
--
73
Bob W3RDL
|
Re: [SoftwareControlledHamRadio] Ver066_9_3_22_25
Yeah exactly right¡ everyone is use to having a BPF in transmit to clean up the signal before transmitting¡. ? But what many SDRs are missing is a preselector¡ a band filter mechanism in receive that only allows the band you are listening through (Hence two BPFs for dual receive¡ because you could be on different bands).? And because SDRs (and particularly this SRD that can operate from about 400kc up to almost 150 mhz), receiving a very loud signal pretty much anywhere in its receive range can desensitize the front end/ mixer to the point that you hear nothing!? We fixed that with the BPF in the T41 operating in Receive too¡. ? So when at Field Day operating with friends on different bands¡ you won¡¯t see any interference in the receiver from them. ? That¡¯s the reason we used a 5 pole filter¡the skirts are very sharp so all the trash outside of the TX and RX frequency is greatly attenuated. ? ? 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@... ? ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Oliver KI3P via groups.io
Sent: Wednesday, April 2, 2025 4:09 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] Ver066_9_3_22_25? Bill can comment further, but the BPF should be in the signal path in both RX and TX mode.? In TX mode it cleans up the signal before it goes to the PA. This means that higher-order harmonics of the signal produced by the exciter -- copies of the signal at multiples of the transmit signal -- are filtered out and not amplified by the PA. These would be removed by the LPF anyway before they could hit the antenna, but removing them before the PA helps with signal quality because the PA isn't having to amplify signals at multiple bands simultaneously. In RX mode the BPF keeps the other bands away from the input to the mixer. If you didn't have the BPF in place you would expect to get a higher noise level in the audio at best, and distortion from strong signals in other bands at worst. On Wednesday, April 2nd, 2025 at 3:54 PM, epif18 via groups.io <epif18@...> wrote:
Well, I did some more troubleshooting and this is what I found: I stuck some troubleshooting code at the beginning (first line) of loop().? Draw a line on the display.? Well, looked like setup never exited.? Stuck that code in various places in .ino and eventually found that swrSetup() was hanging up.? I have the SWR_AD7991 installed but not the transformer (shorted RF In to RFOut). I commented #define V12_LPF_SWR_AD7991 out.? Then I commented out swrSetup() and 66.9 ran! Looks like it's not in the latest code on github (KI3P/SDTVer066-9) that was updated 2 weeks ago. I've shut down my radio and brought it back up and all is good. Still a little noisy on 40M but 20M seems to be working great. While I'm at it, when should the BPF_TX and _RX be in or out?? I attached a test cable to the LPF ACC Control connector and those signals are different moving from 66.4 to 66.9.? In 66.4, BPF_RX was out in SSB mode and in when in CW mode.? In 66.9, it appears that BPF_RX is "in" in both modes.?
?
|
Yep that¡¯s it and its in the right orientation.? The U1 part should be on the board 180 degrees from straight up and I think you have that right too¡.. with pin 1 at the white dot in the lower right corner¡ ? ? 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@... ? ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Robert Luken W3RDL via groups.io
Sent: Wednesday, April 2, 2025 2:07 PM
To: [email protected]
Subject: Re: [AmateurRadioBuilders] Display driver board? Bill, is this what you want? On 4/2/2025 10:46 AM, K9HZ via groups.io wrote: Take a picture of the driver board in place on the MAIN board please¡ ? One thing I did that I regret is placing the ¡°U1¡± symbol at the bottom of the IC.? The little white registration dot for PIN 1 is at the bottom right. ? ? 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@... ? ? ? Completed the build for 5V. No shorts, no opens, and all connections traced and ok. However, with the Board in place, no Display. Checked it twice and made sure that both connectors were fully seated. The system still works without it, so no harm. I'll try again later and check some voltages. On 3/31/2025 6:36 AM, Oliver KI3P via groups.io wrote: On Sunday, March 30th, 2025 at 2:47 PM, Robert Luken W3RDL via groups.io <now.w3rdl@...> wrote:
Got it yesterday, heading out to the workshop to build it. May have missed your note on 5v/3.3v. On 3/30/2025 1:55 PM, K9HZ via groups.io wrote: I sent out five of those new display driver boards about a week ago and only saw posted that Terrance got his working as was able to use a 3-foot long display cable without display-T41 errors/lockups. Anyone else built it yet? I know i didnt publish an assembly manual before i headed out of the country but the thing is pretty simple and i did send out a note re how to make it work on 5v or 3.3v. Anyone else? I think its a winner but would like to know so i can get parts and boards ordered to send these out before Hamvention ? 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: ? email: bill@...
-- 73  Bob W3RDL
?
--
73 Bob W3RDL
--
73 Bob W3RDL
|
Bill, is this what you want?
On 4/2/2025 10:46 AM, K9HZ via
groups.io wrote:
Take a
picture of the driver board in place on the MAIN board
please¡
?
One thing
I did that I regret is placing the ¡°U1¡± symbol at the bottom
of the IC.? The little white registration dot for PIN 1 is
at the bottom right.
?
?
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@...
?
?
?
Completed the build for 5V. No shorts, no opens, and all
connections traced and ok. However, with the Board in place,
no Display. Checked it twice and made sure that both
connectors were fully seated. The system still works without
it, so no harm. I'll try again later and check some voltages.
On 3/31/2025 6:36 AM, Oliver KI3P via
groups.io wrote:
On Sunday, March 30th, 2025 at 2:47 PM,
Robert Luken W3RDL via groups.io <now.w3rdl@...>
wrote:
Got it yesterday, heading out to the workshop to build
it. May have missed your note on 5v/3.3v.
On 3/30/2025 1:55 PM, K9HZ via
groups.io wrote:
I sent out five of those new
display driver boards about a week ago and only saw
posted that Terrance got his working as was able to
use a 3-foot long display cable without display-T41
errors/lockups. Anyone else built it yet? I know i
didnt publish an assembly manual before i headed out
of the country but the thing is pretty simple and i
did send out a note re how to make it work on 5v or
3.3v.
Anyone else? I think its a winner
but would like to know so i can get parts and boards
ordered to send these out before Hamvention
?
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:
?
email: bill@...
--
73 
Bob W3RDL
?
--
73
Bob W3RDL
--
73
Bob W3RDL
|
My 4 poles mesh filters results :
|
? This one too¡ ? ? 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@... ? ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of K9HZ
Sent: Wednesday, April 2, 2025 10:38 AM
To: [email protected]
Subject: Re: [AmateurRadioBuilders] More BPF Results? This company carries them in the USA: ?
? ? 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@... ? ? ? I got the T37-7s from Power Magnetics in the UK: They offer fast and reliable shipping to the States.
|
This company carries them in the USA: ?
? ? 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@... ? ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of John Bennett via groups.io
Sent: Wednesday, April 2, 2025 10:09 AM
To: [email protected]
Subject: Re: [AmateurRadioBuilders] More BPF Results? I got the T37-7s from Power Magnetics in the UK: They offer fast and reliable shipping to the States.
|
I got the T37-7s from Power Magnetics in the UK:
They offer fast and reliable shipping to the States.
73,
john
|
Nice work John
?
Where did you find t37-7 cores seem to be very scarce.
Tim W4YN
|
Take a picture of the driver board in place on the MAIN board please¡ ? One thing I did that I regret is placing the ¡°U1¡± symbol at the bottom of the IC.? The little white registration dot for PIN 1 is at the bottom right. ? ? 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@... ? ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Robert Luken W3RDL via groups.io
Sent: Monday, March 31, 2025 1:59 PM
To: [email protected]
Subject: Re: [AmateurRadioBuilders] Display driver board? Completed the build for 5V. No shorts, no opens, and all connections traced and ok. However, with the Board in place, no Display. Checked it twice and made sure that both connectors were fully seated. The system still works without it, so no harm. I'll try again later and check some voltages. On 3/31/2025 6:36 AM, Oliver KI3P via groups.io wrote: On Sunday, March 30th, 2025 at 2:47 PM, Robert Luken W3RDL via groups.io <now.w3rdl@...> wrote:
Got it yesterday, heading out to the workshop to build it. May have missed your note on 5v/3.3v. On 3/30/2025 1:55 PM, K9HZ via groups.io wrote: I sent out five of those new display driver boards about a week ago and only saw posted that Terrance got his working as was able to use a 3-foot long display cable without display-T41 errors/lockups. Anyone else built it yet? I know i didnt publish an assembly manual before i headed out of the country but the thing is pretty simple and i did send out a note re how to make it work on 5v or 3.3v. Anyone else? I think its a winner but would like to know so i can get parts and boards ordered to send these out before Hamvention ? 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: ? email: bill@...
-- 73  Bob W3RDL
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73 Bob W3RDL
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Excellent report John.? One question; does your measured response include the RF Switches?? Attached are my notes on the BPF. dave, n3ds
I just uploaded the results of a T41 BPF redesign, the salient features of which are as follows:
1) All filters were re-simulated in ELSIE using AI6YM kit capacitor values (which differ slightly from K9HZ values as shown in the attached file).
2) ARRL and Toroid.Info toroid material recommended frequency ranges and tolerances were taken into consideration.
3) No Type 0 (phenolic) material toroids were used. At least for me, these produce inductance values all over the place.
4) Air coils were used for all very small values of inductance.
5) All toroids were wound with 28 gauge wire. Heavier gauge (22 or 24) was used for air core inductors.
6) Inductor values were checked with LCR meter and ¡°pre-tuned¡± prior to insertion. In some cases a turn had to be added or removed from the calculated number in order to obtain a better value.
7) The filter as a whole was then tuned until loss was less than at least 3 dBm for entire range.
8) Filter performance was measured with calibrated and normalized DSA832-TG spectrum analyzer, then saved.
9) Filter ELSIE simulated vs. measured performance was displayed using custom Python program.
10) Design details and resulting performance are in the posted file. I expect that even better performance is possible with more fussing.
Design files available upon request.
?
73,
John Bennett
AE0AM
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That is very nice filter performance, and even better documentation! Thank you for sharing it.
On Tuesday, April 1st, 2025 at 1:15 PM, John Bennett via groups.io <jkb@...> wrote:
I just uploaded the results of a T41 BPF redesign, the salient features of which are as follows:
1) All filters were re-simulated in ELSIE using AI6YM kit capacitor values (which differ slightly from K9HZ values as shown in the attached file).
2) ARRL and Toroid.Info toroid material recommended frequency ranges and tolerances were taken into consideration.
3) No Type 0 (phenolic) material toroids were used. At least for me, these produce inductance values all over the place.
4) Air coils were used for all very small values of inductance.
5) All toroids were wound with 28 gauge wire. Heavier gauge (22 or 24) was used for air core inductors.
6) Inductor values were checked with LCR meter and ¡°pre-tuned¡± prior to insertion. In some cases a turn had to be added or removed from the calculated number in order to obtain a better value.
7) The filter as a whole was then tuned until loss was less than at least 3 dBm for entire range.
8) Filter performance was measured with calibrated and normalized DSA832-TG spectrum analyzer, then saved.
9) Filter ELSIE simulated vs. measured performance was displayed using custom Python program.
10) Design details and resulting performance are in the posted file. I expect that even better performance is possible with more fussing.
Design files available upon request.
?
73,
John Bennett
AE0AM
?
?
|
I just uploaded the results of a T41 BPF redesign, the salient features of which are as follows:
1) All filters were re-simulated in ELSIE using AI6YM kit capacitor values (which differ slightly from K9HZ values as shown in the attached file).
2) ARRL and Toroid.Info toroid material recommended frequency ranges and tolerances were taken into consideration.
3) No Type 0 (phenolic) material toroids were used. At least for me, these produce inductance values all over the place.
4) Air coils were used for all very small values of inductance.
5) All toroids were wound with 28 gauge wire. Heavier gauge (22 or 24) was used for air core inductors.
6) Inductor values were checked with LCR meter and ¡°pre-tuned¡± prior to insertion. In some cases a turn had to be added or removed from the calculated number in order to obtain a better value.
7) The filter as a whole was then tuned until loss was less than at least 3 dBm for entire range.
8) Filter performance was measured with calibrated and normalized DSA832-TG spectrum analyzer, then saved.
9) Filter ELSIE simulated vs. measured performance was displayed using custom Python program.
10) Design details and resulting performance are in the posted file. I expect that even better performance is possible with more fussing.
Design files available upon request.
?
73,
John Bennett
AE0AM
?
?
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John Owens K1JO
K9HZ
