[DSP-10] DSP-10 Power-to-Tone recording

[Courtney Duncan]

Hi Bob,  Good to hear from you and to see that things are still happening
in DSP-10 world.

I just used mine this week to peak up my recently upgraded EME system (from
3.0 meters to 3.8 meters on 1296) with respect to focus and choke
placement.  Using the noise measuring capability in FM mode and long-enough
integrations I'm able to have 0.1 dB visibility into changes.  In the end I
was able to measure 10.3 dB sun noise (up from 7.1 dB on the old system).
Most of the difference comes on the quiet measurement with the choke in
place.  > 3 dB worth in fact.

I had a couple of additional DSP-10 kits from the days when I was planning
a more comprehensive station based on several DSP-10s.  I don't plan that
anymore but did recently sell my last kit (aside from the built one that I
still use) just last month.  So there is still interest out there.

On other fronts, I have a friend here locally who is finishing up a novel
about high tech issues in society.  He placed his Google-like corporation
out in the "hills west of Corvallis".  I perked up:  I've been there!  (It
was 2006!)

Hope you and yours are doing well.  We're breathing a lot of smoke down
here.

73 Courtney N5BF

On Wed, Sep 9, 2020 at 3:27 PM Bob Larkin <bob at janbob.com> wrote:

> Here is a note about added capability!
>
> The Power-to-Tone (P2T) function has been around for a long while and
> has proven useful for peaking things on both noise and signals.  Info on
> this is at
> http://www.janbob.com/kd7ts/v396/7P2T.HTM
> I added the capability to record the output level to a file when using
> P2T.  This is a lot easier than trying to remember numbers and jotting
> notes, etc.
>
> This appends to the same UHFA_1.DAT file and when P2T is running,
> CTRL-F toggles record on and off:
> http://www.janbob.com/kd7ts/v396/fileform1.htm#FULL_SPECTRUM
> There is a different format that is appropriate for P2T.  Data lines are
> entered to the file about every 0.6 sec and look like
> "HPT 2020 8 29 1642 2 16.7005556 -0.076"
> where the HPT field means it is for the P2T function, and the fields
> that follow are year, month, day, hhmm, second, decimal hour of day (as
> 0.0 to 23.99999) and power in relative dB.
>
> The last two items can be easily used in a spread sheet to plot the dB
> level vs time.  It is helpful to make notes of the approximate DSP-10
> time for various measurements, such as Sun, Quiet Sky and Earth.
>
> It is best to enable the ALT-F file record after enabling ALT-V P2T.
> This prevents adding bunch of long HA and HB records from the normal
> ALT-F saves. Likewise, toggle ALT-F turn-off before ALT-F.  If you
> forget, the HPT records will all be on the UHFA_1.DAT file, but with the
> other records before or after.
>
> P2T operation is not affected by the ALT-F file save.
>
> To add this capability, switch out your current DOS program uhfa.exe for
> uhfa397.exe:
> http://www.janbob.com/electron/dsp10/UHFA397.zip
>
> Bug reports are welcome.
>
> 73, Bob  W7PUA
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-- 
“If you think procrastination is the thief of time, you should try
moonbouncing!”  Ray Naughton VK3ATN, November 1966 QST
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