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PTT RTS not working (Windows 10 64 bit, Direwolf 1.7), Digirig Mobile

 
Edited

Hello,
I have trouble with PTT, it does not switch to TX, everything else seems to be working fine. Using Digirig Mobile, interfacing IC-207 via digital audio connector, pins used: GND, Audio IN, 9600 bps out, PTT.
When I transmit a packet, it appears in the output by Direwolf but PTT is actually not activated.
Setting in direwolf.conf: PTT COM5 RTS
?
I tested this:
1. shorting GND and PTT contacts on the Digirig cable (shorting shield and the nearest ring): WORKS
2. controlling PTT by FLRig (just the serial port) with serial port RTS configured as PTT: WORKS
3. using VARA FM, configuring RTS of the serial port as PTT: WORKS
4. setting direwolf.conf PTT COM5 -RTS: immediately after launching direwolf.exe the IC-207 switched to TX and remained so until I quit Direwolf => direwolf.exe does control RTS of the COM port.
?
The same Digirig Mobile physical interface works fine with any other software (except UZ7HO soundmodem, see below) in any other O/S (Windows, Linux x64, Raspberry Pi). Audio reception in Direwolf is flawless.
?
Question: what can I do to fix this? At the moment? I am not ready yet to switch packet to a Linux machine.
?
If it helps, I have exactly the same problem with UZ7HO soundmodem, except that Soundmodem does not bother mentioning in documentation or configuration dialog whether RTS or DTR are used specifically to control PTT, but I suppose it does exactly the same thing as Direwolf.?
?
Thank you,?
Jindra OK4RM
 

If the rig is in TX when starting Direwolf, then the PTT polarity is probably reversed.
?
Many of the new interfaces don't directly ground the pin, but drive a optoisolator, transistor, or FET to ground the PTT pin.??
This is very much preferred by the radio manufacturer as well.
I can't speak to the Digirig, but I suggest trying PTT COM5 +RTS in the configuration file.
-------
Robert Giuliano
KB8RCO
 

Jindra,?
?
Have you reduced the level in the Sound Card playback settings? If I set mine (Windows) over 45 the radio will not transmit.?
?
-Randy
 

Randy,
that sounds puzzling to me :)
Would this be caused by the radio or by Digirig?
--
Jindra OK4RM
--
 

Hi, Robert, according to docs it could be only RTS or -RTS. When I tried "+PTT" direwolf reported "PTT for channel? 0 not configured". Jindra
?
On Mon, Feb 24, 2025 at 03:03 PM, Rob Giuliano wrote:
If the rig is in TX when starting Direwolf, then the PTT polarity is probably reversed.
?
Many of the new interfaces don't directly ground the pin, but drive a optoisolator, transistor, or FET to ground the PTT pin.??
This is very much preferred by the radio manufacturer as well.
I can't speak to the Digirig, but I suggest trying PTT COM5 +RTS in the configuration file.
-------
Robert Giuliano
KB8RCO
?
--
Jindra OK4RM
--
 

Right spot on! It was approximately at 40%. I chose randomly a lower value, 14%, and now it started transmitting. Many, many thanks! Jindra
?
On Mon, Feb 24, 2025 at 03:44 PM, Randy Buxton, W4IFI wrote:
Jindra,?
?
Have you reduced the level in the Sound Card playback settings? If I set mine (Windows) over 45 the radio will not transmit.?
?
-Randy
?
--
Jindra OK4RM
--
 

I beg to differ, the soundmodem doc clearly states which lines are used:
If using serial ports, RTS is used for Channel 1, DTR is used for Channel 2
?
And you have the option to swap them:
Swap COM Pins for PTT – this option swaps the PTT lines between channels
?
-Scott, NS7C
 

On Mon, Feb 24, 2025 at 08:45 AM, ok4rm wrote:
[Windows playback level] was approximately at 40%. I chose randomly a lower value, 14%, and now it started transmitting.
By the way, I recommend .
 

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This is baffling to me for a digirig device.? Why would the audio level have anything to with asserting PTT or not? Is this behavior documented somewhere?

--David
KI6HZD


On 02/24/2025 06:44 AM, Randy Buxton, W4IFI via groups.io wrote:

Jindra,?
?
Have you reduced the level in the Sound Card playback settings? If I set mine (Windows) over 45 the radio will not transmit.?
?
-Randy
 

Hi, David,
?
this is not related to Digirig at all. It must be some safety design inside IC-207. What I still don't know is how exactly to determine the correct drive level. I would be grateful if there was some kind of digipeater nearby that would report what is my actual modulation deviation :)
However, I think there is a method to calculate deviation by modulating a single tone and finding nulls, either at carrier frequency or some significant sideband frequency. The nulls in FM spectrum move depending on both the modulation frequency and deviation.
But I have to search, I read the article long time ago...
73 Jindra?
?
On Tue, Feb 25, 2025 at 11:22 PM, David Ranch wrote:

This is baffling to me for a digirig device.? Why would the audio level have anything to with asserting PTT or not? Is this behavior documented somewhere?

--David
KI6HZD


On 02/24/2025 06:44 AM, Randy Buxton, W4IFI via groups.io wrote:
Jindra,?
?
Have you reduced the level in the Sound Card playback settings? If I set mine (Windows) over 45 the radio will not transmit.?
?
-Randy
?
--
Jindra OK4RM
--
 

开云体育

Hi Jindra

I believe the technique is called Bessel null. I found an article "BESSEL NULL FM DEVIATION MEASUREMENT"?


as well as a nice groups.io post with specan images;

/g/tinysa/topic/measuring_fm_deviation_2/97851892

Cheers Bob VK2YQA

On 26/2/25 23:01, ok4rm via groups.io wrote:

Hi, David,
?
this is not related to Digirig at all. It must be some safety design inside IC-207. What I still don't know is how exactly to determine the correct drive level. I would be grateful if there was some kind of digipeater nearby that would report what is my actual modulation deviation :)
However, I think there is a method to calculate deviation by modulating a single tone and finding nulls, either at carrier frequency or some significant sideband frequency. The nulls in FM spectrum move depending on both the modulation frequency and deviation.
But I have to search, I read the article long time ago...
73 Jindra?
?
On Tue, Feb 25, 2025 at 11:22 PM, David Ranch wrote:

This is baffling to me for a digirig device.? Why would the audio level have anything to with asserting PTT or not? Is this behavior documented somewhere?

--David
KI6HZD


On 02/24/2025 06:44 AM, Randy Buxton, W4IFI via groups.io wrote:
Jindra,?
?
Have you reduced the level in the Sound Card playback settings? If I set mine (Windows) over 45 the radio will not transmit.?
?
-Randy
?
--
Jindra OK4RM
--
 

I also have an IC-207 that simply refuses to transmit. I'm almost to the point where I'm going to take the radio apart and see if I can find a problem inside but my gut tells me I won't find anything. I've tried various audio levels, no PTT no matter what I do. I have PTT set to -RTS.?


On Wed, 2025-02-26 at 04:01 -0800, ok4rm via groups.io wrote:
Hi, David,
?
this is not related to Digirig at all. It must be some safety design inside IC-207. What I still don't know is how exactly to determine the correct drive level. I would be grateful if there was some kind of digipeater nearby that would report what is my actual modulation deviation :)
However, I think there is a method to calculate deviation by modulating a single tone and finding nulls, either at carrier frequency or some significant sideband frequency. The nulls in FM spectrum move depending on both the modulation frequency and deviation.
But I have to search, I read the article long time ago...
73 Jindra?
?
On Tue, Feb 25, 2025 at 11:22 PM, David Ranch wrote:


This is baffling to me for a digirig device.? Why would the audio level have anything to with asserting PTT or not? Is this behavior documented somewhere?

--David
KI6HZD


On 02/24/2025 06:44 AM, Randy Buxton, W4IFI via groups.io wrote:
Jindra,?
?
Have you reduced the level in the Sound Card playback settings? If I set mine (Windows) over 45 the radio will not transmit.?
?
-Randy
?
--
Jindra OK4RM
--

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