[Milsurplus] Canadian Marconi CH-25 Parts Dealer

[David Stinson]

Good Morning, Mike.
I bought this one.
https://www.amazon.com/dp/B0759GKKBJ

So far, a very useful item that does what it says it will.
The only problem was an intermittent in one of the two signal output cables,
which was easily fixed by pulling the center pin of the BNC connector 
out a little
to seat it properly.  The various waveform choices confirmed that a 4 or 
5 Volt square wave,
with either 0-to-rail excursions or +/- PTP would drive the crystal 
oscillator stage fully.
You'd expect to need a pulse or square-wave for a crystal oscillator, 
and that was
confirmed in that a Sine Wave of 10-12V PTP to do the job, so Prog 
Oscillators will
work nicely.  There's a 9.2 VDC power buss available that will zener down
for the supply, so it's just a matter of deciding on settling for the 
six available
channels or building an external switch box.
GL OM DE Dave AB5S

p.s I also got one of those little NanoVNA analyser for my 630 Meter work.
Figuring that thing out is a head scratcher, and the nanovna.io group 
doesn't
seem to "cotton" to newbies, at least so far.

On 12/30/2019 7:28 AM, Mike Feher wrote:
>
> Hi Dave –
>
> Which two-channel DDS did you get? Thanks & have a Blessed and Healthy 
> 2020 – 73 – Mike
>
> Mike B. Feher, N4FS
>
>
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