Date   

Re: VCO TP Frequency

Stefan
 

Hi Zack

I while ago I bought a pickit 3 but installed the wrong software. Can you hint me on what i need to install?

Stefan


----- Original Message -----
From:
The122GProject@groups.io

To:
<The122GProject@groups.io>
Cc:

Sent:
Wed, 1 Sep 2021 17:05:03 -0500
Subject:
Re: [The122GProject] VCO TP Frequency


Hi Don,

It appears this is the one I have. It was a lot less than a PICKIT3 made by Microchip. But it performs just fine. I think it is an identical clone.


Yes, I ran some leads from the J1 ICSP connector. to a 5-pin connector that can be connected to the PICKIT3 through a jumper cable (supplied with the PICKIT3). It connects to a USB port. It even detects what the PIC is that is connected to it. I think I found software on line for it - it uses the software supplied by Microchip.

I've used it for a lot of other things, too. I wrote a program for a PIC 16F688 that detects the digital band encoding for the FT897D and switches antennas between 144 and 432 MHz.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 4:46 PM Don Woodward <dbwoodw@...> wrote:
Zack

I do not currently have access to do that, but I can order a programmer and check that out.  Would that be done through the J1 ICSP connector?

I see Tim has suggested a reload so your suggestion is a great one.

Do you have any recommendations on a PICKET3?  I see an original one on Amazon for $110 and clones for less like this one for $23.


73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 2:40 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Don, do you have a way to download the PIC programming with a PICKIT3 and compare it to what the programming is supposed to be? I have checked, found errors in, and reprogrammed a couple others' units because the EEPROM data got corrupted somehow.

Note, if you do this, do it with the unit powered up first! This puts 3.3 volts on the PIC and RF chips and the PICKIT3 senses the voltage and uses the 3.3 volts. If you do it with the unit unpowered, the PICKIT3 will put 5 volts on the line. This is what happened when I burned out my original unit.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 12:59 PM Don Woodward <dbwoodw@...> wrote:
Same here.

Don W
KD4APP 


From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 12:27:58 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Mine does. It starts out red and changes to green. It changes to red on CW transmit. It flashes red with the CW in the beacon mode.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 11:20 AM Jim Moss <n9jim@...> wrote:
Don
Does the LED light up and Change color between rx/tx. ?
Jim



On Sep 1, 2021, at 8:12 AM, Zack Widup <w9sz.zack@...> wrote:


Sort of a combination. I removed R200 and L4. I put a jumper across the pads that are for R47 and C47 instead of the blue wire VA3TO showed. I also put a 68 ohm resistor across the OCXO input connector.

72, Zack W9SZ

On Wed, Sep 1, 2021 at 9:40 AM Don Woodward <dbwoodw@...> wrote:
Zack

Did you do the VA3TO 10MHz mod or the mod in the operation and construction document?

73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 9:44 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:

<image.png>


<image.png>


but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Email sent using Optus Webmail


Re: VCO TP Frequency

 

Hi Don,

It appears this is the one I have. It was a lot less than a PICKIT3 made by Microchip. But it performs just fine. I think it is an identical clone.


Yes, I ran some leads from the J1 ICSP connector. to a 5-pin connector that can be connected to the PICKIT3 through a jumper cable (supplied with the PICKIT3). It connects to a USB port. It even detects what the PIC is that is connected to it. I think I found software on line for it - it uses the software supplied by Microchip.

I've used it for a lot of other things, too. I wrote a program for a PIC 16F688 that detects the digital band encoding for the FT897D and switches antennas between 144 and 432 MHz.

73, Zack W9SZ


On Wed, Sep 1, 2021 at 4:46 PM Don Woodward <dbwoodw@...> wrote:
Zack

I do not currently have access to do that, but I can order a programmer and check that out.  Would that be done through the J1 ICSP connector?

I see Tim has suggested a reload so your suggestion is a great one.

Do you have any recommendations on a PICKET3?  I see an original one on Amazon for $110 and clones for less like this one for $23.


73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 2:40 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Don, do you have a way to download the PIC programming with a PICKIT3 and compare it to what the programming is supposed to be? I have checked, found errors in, and reprogrammed a couple others' units because the EEPROM data got corrupted somehow.

Note, if you do this, do it with the unit powered up first! This puts 3.3 volts on the PIC and RF chips and the PICKIT3 senses the voltage and uses the 3.3 volts. If you do it with the unit unpowered, the PICKIT3 will put 5 volts on the line. This is what happened when I burned out my original unit.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 12:59 PM Don Woodward <dbwoodw@...> wrote:
Same here.

Don W
KD4APP 


From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 12:27:58 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Mine does. It starts out red and changes to green. It changes to red on CW transmit. It flashes red with the CW in the beacon mode.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 11:20 AM Jim Moss <n9jim@...> wrote:
Don
Does the LED light up and Change color between rx/tx. ?
Jim



On Sep 1, 2021, at 8:12 AM, Zack Widup <w9sz.zack@...> wrote:


Sort of a combination. I removed R200 and L4. I put a jumper across the pads that are for R47 and C47 instead of the blue wire VA3TO showed. I also put a 68 ohm resistor across the OCXO input connector.

72, Zack W9SZ

On Wed, Sep 1, 2021 at 9:40 AM Don Woodward <dbwoodw@...> wrote:
Zack

Did you do the VA3TO 10MHz mod or the mod in the operation and construction document?

73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 9:44 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:

<image.png>


<image.png>


but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

Don Woodward
 

Zack

I do not currently have access to do that, but I can order a programmer and check that out.  Would that be done through the J1 ICSP connector?

I see Tim has suggested a reload so your suggestion is a great one.

Do you have any recommendations on a PICKET3?  I see an original one on Amazon for $110 and clones for less like this one for $23.


73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack@...>
Sent: Wednesday, September 1, 2021 2:40 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Don, do you have a way to download the PIC programming with a PICKIT3 and compare it to what the programming is supposed to be? I have checked, found errors in, and reprogrammed a couple others' units because the EEPROM data got corrupted somehow.

Note, if you do this, do it with the unit powered up first! This puts 3.3 volts on the PIC and RF chips and the PICKIT3 senses the voltage and uses the 3.3 volts. If you do it with the unit unpowered, the PICKIT3 will put 5 volts on the line. This is what happened when I burned out my original unit.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 12:59 PM Don Woodward <dbwoodw@...> wrote:
Same here.

Don W
KD4APP 


From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 12:27:58 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Mine does. It starts out red and changes to green. It changes to red on CW transmit. It flashes red with the CW in the beacon mode.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 11:20 AM Jim Moss <n9jim@...> wrote:
Don
Does the LED light up and Change color between rx/tx. ?
Jim



On Sep 1, 2021, at 8:12 AM, Zack Widup <w9sz.zack@...> wrote:


Sort of a combination. I removed R200 and L4. I put a jumper across the pads that are for R47 and C47 instead of the blue wire VA3TO showed. I also put a 68 ohm resistor across the OCXO input connector.

72, Zack W9SZ

On Wed, Sep 1, 2021 at 9:40 AM Don Woodward <dbwoodw@...> wrote:
Zack

Did you do the VA3TO 10MHz mod or the mod in the operation and construction document?

73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 9:44 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:

<image.png>


<image.png>


but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

Tim - VK2XAX
 

Hi Don,

As others have suggested you might like to re-flash the PIC with the code.

I tested every board for frequency, RX & TX output before I shipped them, so I know they all worked before leaving here :)

I did find 2 ( which I still have ) that had a similar problem to yours.

reloading the code to the pic fixed the issue.

Maybe some of the PICs in this batch are a bit "soft"

regards

Tim

--
VK2XAX : QF56if : ITU59 : CQ30 : BMARC : WIA


Re: VCO TP Frequency

Mike Lavelle K6ML
 


On 09/01/2021 5:54 AM Don Woodward <dbwoodw@...> wrote:


In the operation & construction notes it says to expect the frequencies below:





but I am seeing 

1.914GHz on RX
1.916GHz on TX
Are you sure that you can measure frequency that accurately?   I suspect they are correct.  
I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.
You need to listen for the first radio (in Tx mode, key down) with a second radio in rx mode.   

When the first radio is in Tx mode on chan 0, its LO is at 122500.4, it is Txing at 122500.4 and if IF=144.4, the Rx is listening to 122356.0 (LO-144.4) and 122644.8 (LO+IF).   The way for the first radio to hear itself would be to use a DC coupled IF (122500.4 - 0), which is how it works as a radar, picking up IF Doppler shifts of 10s to 100s of kHz.   The first radio may hear itself at other IFs as well, thanks to spurs and overload.

The second radio will hear the first radio properly at 122500.4 because when it is set to Rx mode and ch0, its LO is at 122356.0 and its listening to 122500.4 (LO+144.4) and 122211.6 (LO-144.4).
Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

militaryoperator <Military1944@...>
 

Is the 122G control Schema 1.05 still valid for the 2nd run boards as a basic setup?

Ben


Re: VCO TP Frequency

 

Don, do you have a way to download the PIC programming with a PICKIT3 and compare it to what the programming is supposed to be? I have checked, found errors in, and reprogrammed a couple others' units because the EEPROM data got corrupted somehow.

Note, if you do this, do it with the unit powered up first! This puts 3.3 volts on the PIC and RF chips and the PICKIT3 senses the voltage and uses the 3.3 volts. If you do it with the unit unpowered, the PICKIT3 will put 5 volts on the line. This is what happened when I burned out my original unit.

73, Zack W9SZ


On Wed, Sep 1, 2021 at 12:59 PM Don Woodward <dbwoodw@...> wrote:
Same here.

Don W
KD4APP 


From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 12:27:58 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Mine does. It starts out red and changes to green. It changes to red on CW transmit. It flashes red with the CW in the beacon mode.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 11:20 AM Jim Moss <n9jim@...> wrote:
Don
Does the LED light up and Change color between rx/tx. ?
Jim



On Sep 1, 2021, at 8:12 AM, Zack Widup <w9sz.zack@...> wrote:


Sort of a combination. I removed R200 and L4. I put a jumper across the pads that are for R47 and C47 instead of the blue wire VA3TO showed. I also put a 68 ohm resistor across the OCXO input connector.

72, Zack W9SZ

On Wed, Sep 1, 2021 at 9:40 AM Don Woodward <dbwoodw@...> wrote:
Zack

Did you do the VA3TO 10MHz mod or the mod in the operation and construction document?

73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 9:44 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:

<image.png>


<image.png>


but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

Don Woodward
 

Same here.

Don W
KD4APP 


From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack@...>
Sent: Wednesday, September 1, 2021 12:27:58 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Mine does. It starts out red and changes to green. It changes to red on CW transmit. It flashes red with the CW in the beacon mode.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 11:20 AM Jim Moss <n9jim@...> wrote:
Don
Does the LED light up and Change color between rx/tx. ?
Jim



On Sep 1, 2021, at 8:12 AM, Zack Widup <w9sz.zack@...> wrote:


Sort of a combination. I removed R200 and L4. I put a jumper across the pads that are for R47 and C47 instead of the blue wire VA3TO showed. I also put a 68 ohm resistor across the OCXO input connector.

72, Zack W9SZ

On Wed, Sep 1, 2021 at 9:40 AM Don Woodward <dbwoodw@...> wrote:
Zack

Did you do the VA3TO 10MHz mod or the mod in the operation and construction document?

73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 9:44 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:

<image.png>


<image.png>


but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

Don Woodward
 

yes sir

73

Don W
KD4APP 


From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Jim Moss via groups.io <n9jim@...>
Sent: Wednesday, September 1, 2021 12:20:47 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Don
Does the LED light up and Change color between rx/tx. ?
Jim



On Sep 1, 2021, at 8:12 AM, Zack Widup <w9sz.zack@...> wrote:


Sort of a combination. I removed R200 and L4. I put a jumper across the pads that are for R47 and C47 instead of the blue wire VA3TO showed. I also put a 68 ohm resistor across the OCXO input connector.

72, Zack W9SZ

On Wed, Sep 1, 2021 at 9:40 AM Don Woodward <dbwoodw@...> wrote:
Zack

Did you do the VA3TO 10MHz mod or the mod in the operation and construction document?

73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 9:44 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:

<image.png>


<image.png>


but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

 

Mine does. It starts out red and changes to green. It changes to red on CW transmit. It flashes red with the CW in the beacon mode.

73, Zack W9SZ


On Wed, Sep 1, 2021 at 11:20 AM Jim Moss <n9jim@...> wrote:
Don
Does the LED light up and Change color between rx/tx. ?
Jim



On Sep 1, 2021, at 8:12 AM, Zack Widup <w9sz.zack@...> wrote:


Sort of a combination. I removed R200 and L4. I put a jumper across the pads that are for R47 and C47 instead of the blue wire VA3TO showed. I also put a 68 ohm resistor across the OCXO input connector.

72, Zack W9SZ

On Wed, Sep 1, 2021 at 9:40 AM Don Woodward <dbwoodw@...> wrote:
Zack

Did you do the VA3TO 10MHz mod or the mod in the operation and construction document?

73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 9:44 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:

<image.png>


<image.png>


but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

Jim Moss
 

Don
Does the LED light up and Change color between rx/tx. ?
Jim



On Sep 1, 2021, at 8:12 AM, Zack Widup <w9sz.zack@...> wrote:


Sort of a combination. I removed R200 and L4. I put a jumper across the pads that are for R47 and C47 instead of the blue wire VA3TO showed. I also put a 68 ohm resistor across the OCXO input connector.

72, Zack W9SZ

On Wed, Sep 1, 2021 at 9:40 AM Don Woodward <dbwoodw@...> wrote:
Zack

Did you do the VA3TO 10MHz mod or the mod in the operation and construction document?

73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 9:44 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:

<image.png>


<image.png>


but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

 

Sort of a combination. I removed R200 and L4. I put a jumper across the pads that are for R47 and C47 instead of the blue wire VA3TO showed. I also put a 68 ohm resistor across the OCXO input connector.

72, Zack W9SZ


On Wed, Sep 1, 2021 at 9:40 AM Don Woodward <dbwoodw@...> wrote:
Zack

Did you do the VA3TO 10MHz mod or the mod in the operation and construction document?

73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack=gmail.com@groups.io>
Sent: Wednesday, September 1, 2021 9:44 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:





but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

Don Woodward
 

Zack

Did you do the VA3TO 10MHz mod or the mod in the operation and construction document?

73's

Don W.
KD4APP



From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Zack Widup via groups.io <w9sz.zack@...>
Sent: Wednesday, September 1, 2021 9:44 AM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] VCO TP Frequency
 
Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ

On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:





but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

 

Hmm ... that's interesting.

I ordered two boards, which I received last week. I did the OCXO mod on one board and swapped the bad one in my box for the new one with the OCXO mod. I put the 20 dB horn on it.  I use an Isotemp 10 MHz OCXO.

I set the other one up as a signal source - I did not do any mods on it and I set it up in beacon mode without an antenna. I pointed it in the direction of the other unit  about 3 feet away. I had the digital encoder on both units set to 0, mode A. I found the signal from the transmitter drifting between 144.397 and 144.404. It was pinning the s-meter of my receiver.

73, Zack W9SZ


On Wed, Sep 1, 2021 at 7:54 AM Don Woodward <dbwoodw@...> wrote:
In the operation & construction notes it says to expect the frequencies below:





but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: VCO TP Frequency

Iain Crawford
 

I can confirm that all frequencies in the 2nd batch board I've just received are all as specified in "122G_Operation_Construction_notes_1.07.pdf".


Re: Update #18 - Packaging complete

militaryoperator <Military1944@...>
 


Boards and horns received. 

Many many thanks. 

Ben G4BXD


VCO TP Frequency

Don Woodward
 

In the operation & construction notes it says to expect the frequencies below:





but I am seeing 

1.914GHz on RX
1.916GHz on TX

I can't seem to find the TX signal for either unit on my IF receiver anywhere in the 144.xxx range.

Were there changes in the frequencies made in this second batch?

73's

Don W.
KD4APP
EM84au



Re: L2 Replacement - RESOLVED

Don Woodward
 

I must have had a cold solder joint on the new L2 - I removed the first replacement, cleaned the pads and soldered on another new L2.  I also did the 10MHz mod while I was working on it, and everything is working now.

Thanks for the quick response, Mike - it got me thinking.

73's

Don W.
KD4APP
EM84au


From: The122GProject@groups.io <The122GProject@groups.io> on behalf of Mike Lavelle K6ML via groups.io <miclevel@...>
Sent: Tuesday, August 31, 2021 6:17 PM
To: The122GProject@groups.io <The122GProject@groups.io>
Subject: Re: [The122GProject] L2 Replacement
 
Hi, Don ...

I would not worry about 300nH vs 330nH for L2; it's not critical, just a power supply noise filter.   The low voltage sensing input is the junction of R3, R4 and pin 19 of the PIC (IC1),  which is just a voltage divider from the junction of L2, C12 and pin 1 of IC10 (the power supply input to the IC10 voltage converter/regulator).   

Double check that your power supply is putting out at least 11V. 

If so, compare the voltage at the junction of L2, C12 and pin 1 of IC10 on your two boards, should also be the power supply voltage, minus a diode drop.   If your L2 substitute has an unusually low current rating/unusually high resistance, there might be enough extra drop on the extra board for a low voltage (unlikely, but easy to check).

Next compare the voltage at the junction of R3, R4 and pin 19 of the PIC (IC1) on the two boards, should also be the same, but if lower on the second board, that's the reason for the low voltage report.  If radically low, perhaps R3 also fell off your
second board?

Anyway, as long as the IC10 output is +5V, everything should work fine, despite any 'low voltage' reports   (BTW, the LED will alternate flashing red/green on a low voltage report, no need to look at RS232).

Have fun,

Mike K6ML
On 08/31/2021 2:48 PM Don Woodward <dbwoodw@...> wrote:


On my second unit, L2 came off and was lost as I started working on setting it up.  I ordered a replacement (1-week later) and I thought I ordered a 330nH but turns out I wrongly ordered a 300nH and did not realize it until I installed it and started testing the board.  I am getting low voltage alerts on the serial output - using same power supply as used on the first board which had no issues.

Is the wrong value causing this or should I look elsewhere?

I can order a 330nH 0805, but it will be a week before it will arrive if I order from Newark where I got the other one.

I found a 330nH at Newark - do these specs look OK for the 330nH L2 replacement?


36502AR33JTDG - Surface Mount High Frequency Inductor, 3640 Series, 330 nH, 5%, 0805 [2012 Metric], 600 MHz RoHS Compliant: Yes
www.newark.com
TIA & 73's

Don W.
KD4APP
EM84au



Re: Output Spurs

Mike Lavelle K6ML
 

One more note... I did program a new pair (Tx/Rx on 122950.000, IF of 144.400, use Andrew's program) to work nearer to the (lower atmospheric loss) high end of the band.
Can't say that I did a thorough bench test of the spectrum, but N9JIM tried it in his VK3CV radio on a couple of occasions, and it seemed to work well.    So, some PLL Tx/Rx-IF pairs will work better than others, as expected for a 'frac-N' PLL spur issue.


Re: Output Spurs

Mike Lavelle K6ML
 

The PLL spurs do seem somewhat sensitive to the reference drive level (when you replace the onboard VCXO with an external OCXO, it's worth checking/adjusting drive level) and reference quality.   No surprise.    

Just to clarify my comments:
- the DC-DC converter spur is very weak and appears at the converter freq, about +/- 480 kHz from the carrier.
- the Rx LO spurs can cause reciprocal mixing of off channel noise (increased noise figure) or a possible (but unlikely) interferer at the spur offsets.
- the locals listening to my beacon were hearing reciprocal mixing at the Rx LO spur offsets (+/- 250 kHz)
- my spectrum measurements (on first run VK3CV boards with/without DC-DC converter and with/without external ref) for the 122500.4 Rx and Tx and 122400 Tx  match Iain's fairly well.

361 - 380 of 2815