[Boatanchors] FMing Prog. Oscillators (was GE Portamobil)

[Bill Cromwell]

Hi Dave,

I lost interest in V/UHF FM (and repeaters) years ago. I have thought 
about FMing the programmable modules. The programmable frequency 
circuits in V/UHF FM radios are directly FMed. And phase modulation by 
the mic audio can also be applied after the oscillator. Have you 
actually tried to FM the programmable modules? How do people apply the 
GPS spanking to those modules. The spanking could as easily FM the unit 
as stabilize it.

Even though I do not have use for it, now I will have to try it! I am 
ordering some from QRPLabs anyway. Before I install one of them in my 
gear I will play with FMing it.

73,

Bill  KU8H

On 2/26/19 9:14 AM, David Stinson wrote:
> (Copied to other lists for general interest:)
> 
> I've been working on a concept.
> 
> Can't FM a programmable oscillator, but:
> Say you have a rig that requires Fo/18 crystal.
> So 146.52 would be 8140 KC.
> And you have another crystal laying around, doesn't
> matter the freq since we can order any freq prog. osc,
> as long as the crystal's a fundamental.
> Assume a common Color Burst crystal of 3.5795 Mc.
> 
> We order a 4560.5 KC oscillator.
> With two transistors and a couple of diodes,
> we can sample mic audio through an adjustable
> audio amplifier, then apply it to an oscillator
> with the 3579.5 crystal, say in the Emitter lead.
> This crystal oscillator WILL FM at the audio rate.
> Output this and the prog. oscillator to a couple
> of diodes as a non-linear mixer.
> One of the products will
> be 8140 KC, FMing at the audio rate.
> Don't need much of the mic audio since we'd
> only need to swing the Color crystal about 300
> cycles, since it will be multiplied by 18.
> 
> GL OM ES 73 DE Dave AB5S
> 
> 
> 
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bark less - wag more