[ARC5] Amazon Sig Gen as Crystal Subber

[Ian Wilson]

Hi Tim,
The Koolertron unit sounds very useful. Are there any reviews (or tech
specs) online?
I'm interested in a couple of things:
  - what's the frequency generation technology (DDS or synthesis / if DDS,
how many bits and what spurious levels)
  - can the device be remotely programmed (e.g. think of using it as a VFO,
controlled from a separate processor)

73, ian K3IMW

On Sun, Apr 12, 2020 at 2:17 PM Tim <timsamm at gmail.com> wrote:

> So, David, which one of those available on Amazon are you using? The
>> Koolertron 60 MHz
>> job, or another one? It is kinda hard to tell from your photo.
>>
>> Ken W7EKB
>>
> ----------------------------
>
>> Hi Guys - I have the Koolertron DDS, the 60 MHz option.
>>
> I'm not familiar with the VHF ARC-5 radio design offhand but I assume Dave
> is using the DDS in lieu of a crystal to drive the R/T oscillator
> circuits.  I would guess those utilize multiplier chains.  So I guess
> driving a multiplier chain would best function with an input already rich
> in harmonics, unlike a pure sine.  So in that application square waves rich
> in 3rd harmonics, or pulses in general makes good sense.  As a drive source
> for an HF MOPA transmitter (or receiver LO) a sine works well. Thanks Dave
> - you should be getting a commission!  A pretty handy piece of test gear...
> (my LM-14 is giving me the Stink Eye !)
> 73, Tim
> N6CC
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