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Re: FT-847 use with transverter for 144 MHz from 28MHz

 

Was the plan to use 0db as the drive level, if so the lpf issue won't be a problem because your bypassing the PA


On Mon, Apr 15, 2024, 1:20?PM Cam - W4XXV via <cam=[email protected]> wrote:

I should have added? "and other transverters".

I also want to make use of 222 MHz as well, requiring the use of 28-31 MHz transmit.

So, the question still stands.
--
Cam, W4XXV
Re: FT-847 use with transverter for 144 MHz from 28MHz

 

I should have added? "and other transverters".

I also want to make use of 222 MHz as well, requiring the use of 28-31 MHz transmit.

So, the question still stands.
--
Cam, W4XXV
Re: FT-847 use with transverter for 144 MHz from 28MHz

 

Cam, why do you want to use a transverter with the FT-847?? ?Is there something deficient?with the 2M mode of the Ft-847?? If so, seems like it would be far easier to address the problem than to go the transverter route.

73,

Tom K6EU



On Mon, Apr 15, 2024 at 10:57?AM Andrew Lenton via <a=[email protected]> wrote:

You can easily change the FT847 to TX from 144 to 174 MHz,

?

Also the use version goes from 144 to 148,

?

?

?

?

73

?

Andrew

?

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Cam - W4XXV
Sent: 15 April 2024 18:05
To: [email protected]
Subject: [YaesuFT847] FT-847 use with transverter for 144 MHz from 28MHz

?

Hello all,
I'm trying to research the capabilities of the use of the FT-847 with a transverter, requiring the use of 10 meters. The issue may be the requirement for opening transmit to 32 MHz to get to the top of the 2 meter band.

For this transverter, 28 MHz = 144 MHz, and 32 MHz = 148 MHz.

I know that it's possible to modify the FT-847 to transmit above 30 MHz, but I've seen reference to the low pass filter being a possible issue.
Does anyone have experience with this, and are there any gotyas?

Thanks,
--
Cam, W4XXV
Re: FT-847 use with transverter for 144 MHz from 28MHz

 

¿ªÔÆÌåÓý

You can easily change the FT847 to TX from 144 to 174 MHz,

?

Also the use version goes from 144 to 148,

?

?

?

?

73

?

Andrew

?

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Cam - W4XXV
Sent: 15 April 2024 18:05
To: [email protected]
Subject: [YaesuFT847] FT-847 use with transverter for 144 MHz from 28MHz

?

Hello all,
I'm trying to research the capabilities of the use of the FT-847 with a transverter, requiring the use of 10 meters. The issue may be the requirement for opening transmit to 32 MHz to get to the top of the 2 meter band.

For this transverter, 28 MHz = 144 MHz, and 32 MHz = 148 MHz.

I know that it's possible to modify the FT-847 to transmit above 30 MHz, but I've seen reference to the low pass filter being a possible issue.
Does anyone have experience with this, and are there any gotyas?

Thanks,
--
Cam, W4XXV
FT-847 use with transverter for 144 MHz from 28MHz

 

Hello all,
I'm trying to research the capabilities of the use of the FT-847 with a transverter, requiring the use of 10 meters. The issue may be the requirement for opening transmit to 32 MHz to get to the top of the 2 meter band.

For this transverter, 28 MHz = 144 MHz, and 32 MHz = 148 MHz.

I know that it's possible to modify the FT-847 to transmit above 30 MHz, but I've seen reference to the low pass filter being a possible issue.
Does anyone have experience with this, and are there any gotyas?

Thanks,
--
Cam, W4XXV
Re: FT-847 Digital Modes

 

Well the SignaLink USB working great on the 847. 30w out got Japan on my G5RV.

215222 -4 0.1 1104 + CQ JG3LGD PM74

?

215230 Tx 829 + JG3LGD KJ4DHF FM17

215237 -5 0.2 1104 + KJ4DHF JG3LGD -06

215245 Tx 829 + JG3LGD KJ4DHF R-05

215252 -4 0.2 1104 + KJ4DHF JG3LGD RR73

215300 Tx 829 + JG3LGD KJ4DHF 73
Re: FT-847 Digital Modes

 

John,

There some magic inside that SL to close the circuit to allow the audio to pass to Tx on the rig. I just cannot figure out what is happening to make it work with the Easy Digi board and the pg 16 drawing from the 847 manual.
Re: FT-847 Digital Modes

 

¿ªÔÆÌåÓý

Correct; the 847 doesn't do VOX, but I believe the SignaLink does.? That was the only way it made sense to me that things were working.? The SignaLink was keying the rig via its own internal VOX, and the CAT, while also keying the rig, was overruled by the rig seeing PTT on the Data port so getting the audio signal from there.?

If setting WSJT-x to VOX still has the 847 going into transmit, it must be due to the SignaLink providing that function.? From what you write, making only the change to the WSJT-x software for VOX did nothing?? THAT I can't explain.? If the only PTT being recognized by the 847 was coming from CAT, and the audio only coming in from the Data port, that shouldn't have worked unless the signal was really really loud.? What was it set to?

Greg? KO6TH


John P. wrote:

Tim,

I took up your request to test the keying my radio using a SignaLink and VOX.? My Audio is fed from the SignaLink to the radio using the SLCAB847 cable, plugged into the Data In/Out jack located under the HF SO239 connector.

I wasn't able to complete the test VOX keying with SignaLink audio because the FT-847 does it does not support VOX.? I searched the manual and the internet before coming to that conclusion.? Using WSJT-X I tested the remaining two PTT options, DTR & RTS, and my radio would not transmit with either of those selected.? The only way that I can make my radio transmit is by using CAT PTT.

I also tested a couple of older AFSK programs with my SignaLink and CAT control.? Testing with FLDigi, my radio would transmit as long as I select FLRig as the rig control option, and FLRig is configured for the FT-847 with the COM port & baud rate set.? I also tested DigiPan and the radio will transmit if I select the COM port that is connected to the radio.? It's interesting to note that DigiPan does not have a setting for the baud rate, but it is set in my computer to match the rate that my FT-847 is configured for.

73,

John
AB0VX
Re: FT-847 Digital Modes

 

Tim,

I took up your request to test the keying my radio using a SignaLink and VOX.? My Audio is fed from the SignaLink to the radio using the SLCAB847 cable, plugged into the Data In/Out jack located under the HF SO239 connector.

I wasn't able to complete the test VOX keying with SignaLink audio because the FT-847 does it does not support VOX.? I searched the manual and the internet before coming to that conclusion.? Using WSJT-X I tested the remaining two PTT options, DTR & RTS, and my radio would not transmit with either of those selected.? The only way that I can make my radio transmit is by using CAT PTT.

I also tested a couple of older AFSK programs with my SignaLink and CAT control.? Testing with FLDigi, my radio would transmit as long as I select FLRig as the rig control option, and FLRig is configured for the FT-847 with the COM port & baud rate set.? I also tested DigiPan and the radio will transmit if I select the COM port that is connected to the radio.? It's interesting to note that DigiPan does not have a setting for the baud rate, but it is set in my computer to match the rate that my FT-847 is configured for.

73,

John
AB0VX
Re: FT-847 Digital Modes

 

No worries Spence. Maybe this will help the next new owner of 847.
Re: FT-847 Digital Modes

 

¿ªÔÆÌåÓý

Sorry about that as I totally got confused. I think the link was generally for anyone? Just provides a simple switching solution.

? I think I need to go back and re¡¯read this thread from the beginning and see what the original issue was. I apologise for any confusion caused.

De Spence G5STO



Sent while portable! please excuse typos.

On 25 Mar 2024, at 20:51, Tim Davis KJ4DHF via groups.io <kj4dhf@...> wrote:

?Spence,

Not sure if your last post was for me or Greg.

?I can get it to work no problems using the DB9 pins for PTT. I was hoping not to have to build a serial cable for rig and splice into the cable. I was hoping I could get it to work just using the audio line to activate PTT on the Easy Digi board to pass the audio back into radio.
?I just bought me a 15ft DB9 serial cable cut in the middle made the connection for PTT and spliced the 3 wires for CAT back together inside the project box for Null modem pinout to the radio.

Re: FT-847 Digital Modes

 

Spence,

Not sure if your last post was for me or Greg.

?I can get it to work no problems using the DB9 pins for PTT. I was hoping not to have to build a serial cable for rig and splice into the cable. I was hoping I could get it to work just using the audio line to activate PTT on the Easy Digi board to pass the audio back into radio.
?I just bought me a 15ft DB9 serial cable cut in the middle made the connection for PTT and spliced the 3 wires for CAT back together inside the project box for Null modem pinout to the radio.
Re: FT-847 Digital Modes

 

¿ªÔÆÌåÓý

Hi Greg, check out John M0UKD¡¯s website. At the bottom of this page just above the comments section is a design that should help.



De Spence G5STO

Sent while portable! please excuse typos.

On 25 Mar 2024, at 20:16, Tim Davis KJ4DHF via groups.io <kj4dhf@...> wrote:

?Greg,

Thanks for your input. Yes that is the challenge for me. Being able to use the PTT function on the Data IN/OUT jack at the rig to pass the audio from pc to rig without damaging the radio circuitry. I am not sure of how to wire the transistor into the tip audio line and where to tie it to the board an work properly and not damage the radio. The cost of the Digi Easy is dirt cheap 847 $$$.

Re: FT-847 Digital Modes

 

Greg,

Thanks for your input. Yes that is the challenge for me. Being able to use the PTT function on the Data IN/OUT jack at the rig to pass the audio from pc to rig without damaging the radio circuitry. I am not sure of how to wire the transistor into the tip audio line and where to tie it to the board an work properly and not damage the radio. The cost of the Digi Easy is dirt cheap 847 $$$.

Re: FT-847 Digital Modes

 

Using one of the modem lines (RTS or DTR) is likely the "universal" control point for PTT, with a single transistor acting open-collector for pulling the PTT line low.? I would add a series resistor (a few k-ohms) to the base as a current limit.? I believe Craig KM6LYW's DigiPi uses a FET instead of a bipolar transistor, with the same effect.

That said, the challenge for the 847 isn't so much the source of the PTT signal, it's the adapting of that one source of PTT and audio to the two "data" ports (one for HF SSB, one for VHF/UHF FM), and not using the broken CAT interface for anything other than setting the operating frequency.

Greg KO6TH


Spence G5STO via groups.io wrote:

Is there no way to take the RTS pin on the 9 pin connector and run it into a transistor at the base and use it to switch the PTT line at 0vdc.

This way you can still use the RX, TX and gnd pins for CAT control and use RTS high (12v I believe) as breakout. You don¡¯t need any voltage on the collector and the emitter to a common ground with the base and appropriate resistor to the RTS. The PTT can sit in collector and be grounded via the resistor. Most software should allow the RTS keying but I will be honest I¡¯ve not been following this thread that closely.

Please correct me if this won¡¯t work for you?

De Spence G5STO

Ps: I use this method to ground my relays via 0vdc line into an optoisolator. The optoisolator is powered and the transistor brings the internal IR led to ground to switch on.


Sent while portable! please excuse typos.

On 24 Mar 2024, at 23:00, Greg D <ko6th.greg@...> wrote:

?Windows-only application, so not something I can use. Perhaps others...

Greg KO6TH


Spence G5STO via groups.io wrote:
Try a program called VSPE or Virtual Serial Port Emulator and choose splitter. Then select COM20 as your virtual port and make sure you set a common baud rate. Then set the same baud rate for CAT and control in the other 2 options whilst ensuring the baud rate is correct.

De Spence G5STO

VSPE is free and give prompts after 30 days to register but it doesn¡¯t stop functioning just doesn¡¯t allow you to save the settings until you register.




Re: FT-847 Digital Modes

 

Spence,

Right now I am on Windows as have not found a logbook rig interface program I like using yet on Linux. Tried a couple but cannot get use to the layouts. I been using HRD 20+ years and real use to it and it's layout.

?I am not sure on the transformers specs except that they are 600:600. I found these interfaces online about 15 years ago and grabbed some up for my FT100,FT990,FT1000D. They work great on them radio's. I had a couple in spare parts box and when I acquired the 847 I said what the heck let me see if I can get it to work on the 847.

Re: FT-847 Digital Modes

 

¿ªÔÆÌåÓý

Ooohhh I like that a lot. It¡¯s similar to my first data interface except I used a USB sound card too and patched the transformed into it direct.

I take it you are using a 600:600 transformer and 1k:8ohm?

Also it looks like a 4N25 for the PTT line. If you look inside most sound card interfaces there is a similar design and $10 worth of parts but after a few LED¡¯s it¡¯s marketed for $100 which annoys me somewhat.?

? I¡¯m not sure if your using a MAC or Linux but there is still the possibility of using Wine for VSPE but I¡¯m really not a MAC man just Linux and Windows. I work a lot of satellite and trying to get the various programs tied into KISS 8100 port and Doppler shift and PTT together can only be achieved with VSPE. GreenCube springs to mind.

? I think I posted an image of my breakout board for just this reason but I will post it again. I needed 9600baud from the SCU17 but the SCU17 was never designed for the FT847 so had to design a breakout board to tap into the 9600baud data.

? Using two of these little boards I designed means I can simply move the 9600baud data to the 1200baud input to the sound card where before it wasn¡¯t possible.

? I would suggest you could make a 9 pin version of this on vero or breadboard just for testing.


? Great thread this and it¡¯s exploring the same issues I had many moons ago.?

I do have an original SignaLink SL1 without sound card and it does use either VOX or PTT depending on how you configure it. That¡¯s where the extra $90 goes when you buy a commercial item as I¡¯ve experimented with VOX and it¡¯s fraught with small issues, especially with RF getting into the works.

De Spence G5STO

image0.jpeg


Sent while portable! please excuse typos.

On 25 Mar 2024, at 11:49, Tim Davis KJ4DHF via groups.io <kj4dhf@...> wrote:

?Hello Spence,

That is basically what I had to do to use this interface. I had to have access to to the RYS pin on the pc side of the CAT cable.
So I just I need to splice into the serial cable and tap the RTS pin from the PC to the opticoupler and ground. Then I made the cross over ( null modem) to the radio inside the project box going to the serial port on radio. Then just added the audio lines to the pc and radio.

Re: FT-847 Digital Modes

 

Hello Spence,

That is basically what I had to do to use this interface. I had to have access to to the RYS pin on the pc side of the CAT cable.
So I just I need to splice into the serial cable and tap the RTS pin from the PC to the opticoupler and ground. Then I made the cross over ( null modem) to the radio inside the project box going to the serial port on radio. Then just added the audio lines to the pc and radio.

Re: FT-847 Digital Modes

 

Is there no way to take the RTS pin on the 9 pin connector and run it into a transistor at the base and use it to switch the PTT line at 0vdc.

This way you can still use the RX, TX and gnd pins for CAT control and use RTS high (12v I believe) as breakout. You don¡¯t need any voltage on the collector and the emitter to a common ground with the base and appropriate resistor to the RTS. The PTT can sit in collector and be grounded via the resistor. Most software should allow the RTS keying but I will be honest I¡¯ve not been following this thread that closely.

Please correct me if this won¡¯t work for you?

De Spence G5STO

Ps: I use this method to ground my relays via 0vdc line into an optoisolator. The optoisolator is powered and the transistor brings the internal IR led to ground to switch on.


Sent while portable! please excuse typos.

On 24 Mar 2024, at 23:00, Greg D <ko6th.greg@...> wrote:

?Windows-only application, so not something I can use. Perhaps others...

Greg KO6TH


Spence G5STO via groups.io wrote:
Try a program called VSPE or Virtual Serial Port Emulator and choose splitter. Then select COM20 as your virtual port and make sure you set a common baud rate. Then set the same baud rate for CAT and control in the other 2 options whilst ensuring the baud rate is correct.

De Spence G5STO

VSPE is free and give prompts after 30 days to register but it doesn¡¯t stop functioning just doesn¡¯t allow you to save the settings until you register.




Re: FT-847 Digital Modes

 

Windows-only application, so not something I can use.? Perhaps others...

Greg? KO6TH


Spence G5STO via groups.io wrote:

Try a program called VSPE or Virtual Serial Port Emulator and choose splitter. Then select COM20 as your virtual port and make sure you set a common baud rate. Then set the same baud rate for CAT and control in the other 2 options whilst ensuring the baud rate is correct.

De Spence G5STO

VSPE is free and give prompts after 30 days to register but it doesn¡¯t stop functioning just doesn¡¯t allow you to save the settings until you register.

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