[DSP-10] Particular tricky problem.

[Courtney Duncan]

dufour wrote:
> Several friends and me have some troubles with posting to this list.
> Of course once i used my second email address (f6bed at free.fr)but how 
> many times
> all things was right and the post rejected.Below is my registration to 
> the list. It's also my last trial.
> 

This posting made it to the list.  I think a posting has to come from a 
registered e-mail address.  I'm not sure how it tells, whether by 
looking at the "From:" field or something else in the header.

> Anyway starting my DSP10 assembly (TAPR)i read that in FM the frequency 
> step
> can not go down 5 khz, it's a actual drawback while the european repeaters
> are working on these frequencies  *****0, ****12.5, ****25, ****37.5, 
> ****50,
> ****62.5, ****75, ****87.5, say with a 12.5 khz steping.
> Does this problem be only software problem or some hardware should be 
> changed ?
> 
> 73's de Robert f6bed.
> 

This is purely a software issue.  Nothing needs to be changed in hardware.

I'm running the latest uhfa.exe, version 3.17.  In FM mode, <Alt> F9 and 
F10 step 5 KHz down and up.  <Ctrl> F9 and F10 step 10 KHz down and up. 
  If you set the frequency in another mode (where you can step at nearly 
any size from 1 Hz to 1 MHz by some combination of control keys with F9 
and F10) and then switch to FM mode, it rounds whatever's on the display 
to the nearest 5 KHz.

What you appear to want, however, is a 500 Hz step (0.5 KHz) so you can 
get to 12.5 KHz, etc.  In FM mode, I tried direct frequency entry, <Alt> 
9, and found that whatever frequency I enter, it rounds to the next 1 
KHz down then steps 5 KHz or 10 KHz from there with the above commands.

So, for FM operation, you should be able to get within 500 Hz of any 
frequency, which is generally good enough, though you might have to use 
direct frequency entry rather than stepping easily among channels.  (On 
NBFM you can be 1-2 KHz off or more and still be workable; 500 Hz is 
better than a lot of radios do anyway.)

In principle the software could be configured to do any kind of 
channelization but I doubt that such a thing is very high on anybody's 
official "to do" list.

Courtney

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