[ARC5] Amazon Sig Gen as Crystal Subber

[Mike Feher]

I did buy one based on Dave’s recommendation months ago. The only thing I do not like about it is that it does not use batteries. It has to be plugged in. I have been thinking of adding a battery pack to the bottom of mine just to make it more mobile. 73 – Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of Ian Wilson
Sent: Monday, April 13, 2020 11:12 AM
To: ARC-5 List <ARC5 at mailman.qth.net>
Subject: Re: [ARC5] Amazon Sig Gen as Crystal Subber

 

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 <mailto: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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