Author Topic: Power drop in FT8 Hound mode  (Read 243 times)

4Z4OQ

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Power drop in FT8 Hound mode
« on: 2020-02-05, 16:28:58 »
Hi

After some tweaks I am working standard FT8 with my TS480 w/o any issues. However, orking in F/H mode as Hound when the fax stations are RX on low audio freq, an my TX jumping to the low audio freq (~270hz) my output is attenuate (power signal drops ).

I made a test with another ham located 1 mile from my remote TX and my signal is +7DB (1200HZ audio) and drops down to -12 in 300HZ audion.

Is the RRC got a audio bandwidth limitation/filter in low audio freq?

thanks
Ziv

NA6O

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Re: Power drop in FT8 Hound mode
« Reply #1 on: 2020-02-06, 00:29:56 »
In the Radio settings tab, there is a highpass filter setting (Codec inp HPF Hz).  You should set that to its lowest value, 82 Hz, and do this on both the Radio and Control end so that you can send and receive at the lowest possible frequencies.  Beyond that, I don't know what else may limit low frequency response.

Also, you should be using one of the Linear audio CODECs (set in the Audio Quality item). Linear 16 bits 8 Khz or 16 kHz are best. The ones with compression will add distortion that WSJT does not like.

73,
Gary NA6O