[FoxHunt] Re:HF SSB ADF question

[John Munsey, KB3GK]

If I understand the problem correctly...

The SSB carrier is not there when there is no modulation and then it varies 
with the modulation level. Since this system looks for signal level it 
can't read "nothing" zero signal level and varies with the signal level 
when it is modulated.

I suspect this is the cause of your problem.  I don't know of any "fix" if 
that is indeed the problem.

I have used the Doppler with reasonable success on SSB signals but even 
there they can come and go with modulation.

It will be interesting to hear from others on this.


At 12:29 PM 11/22/2004 -0500, you wrote:
>In using a Taiyo CH 338 HF ADF (crossed loop goniometer type with polar CRT
>readout) I have noticed the following: SSB sigs give no clear "propellor"
>pattern on the CRT, the sig strength varies with voice and no clear 
>azimuth null or
>peak can be seen. The exception is when there is a constant audio, like
>engine acoustic noise on a boat, then it gives the signal a constant strength
>background level (analogous to an AM carrier when no speech is present) which
>allows a good CRT bearing in between spoken syllables. What is the basic 
>problem?
>Is the goniometer effective rotational speed too slow for SSB? Has anyone 
>else
>used these Taiyo ADFs for HF SSB?
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Sincerely,

John Munsey, KB3GK