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Re: FT-8900 / CTCSS Setup / Dinah-C


 

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Someone correct if I'm wrong, but I don't think the FT-8900 has a way to adjust the logic for that behavior. I have the same problem with a Kenwood TM-D700A. However, I know that some other Yaesu radios, like the FT-M100, has an option to only send COS when the squelch is open, not just on carrier, as does the TM-V71A and TM -G710.


One possible solution may be to not use the radio's CTCSS decode, and use usbradio instead of simpleusb, using it's DSP to detect CTCSS. This will only work, however, if you use a 9600 output (discriminator, not AF-stage) from the radio with the squelch open, and this will most likely work much better on ASL3 than HamVoIP.

By default, the? DINAH looks for input on pin 4, which is 1200. This won't provide baseband audio, which you need for the DSP-based CTCSS decode of usbradio to work.


When I am next at that location, I plan to convert my Kenwood TM-D700A remote base node to ASL3 on a thin client, away from HamVoIP on a rPi3 model B, so I can do exactly that.

73
N2DYI

On 7/11/2024 11:49 AM, Victor, KB5AKO via groups.io wrote:

I can¡¯t get my node to accept only ctcss traffic. It works fine, but it will pass traffic even without a ctcss tone.

The FT-8900 is set with ctcss enabled with ENC/DEC.
I am using the main band.
The packet speed is set to 1200.
The packet band is set to main.
I have trimmed the data connector to ensure that it is seated correctly in the port.

The simpleusb-tune settings are:
(H) plfilter= enabled
(J) cos from= usb
(L) ctcssfrom= usb

I have tried to change these parameters with many variations with no success.

These settings work fine on my other node that is using an FT-100. The node with the FT-100 will only accept traffic with ctcss tone as desired.

Any help would certainly be appreciated.

Victor, KB5AKO

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