[R-1051] Megacycle synthesizer

[David Wise]

Plain and later six-packs are incompatible with later and plain mainframes,
respectively, due to the 500cps vs 100cps modules, but the MC module had
no significant changes over its product life.  Any MC will work in any six-pack.
It's pretty easy to troubleshoot, since it's independent of the rest of the
six-pack.  All it needs is power, and 500kHz, which you can supply with a
signal generator.

You don't need exactly 23.498120; the MC synth is a PLL, which uses
a varactor diode to "bend" the crystal to 23.5MHz .  Any crystal
that locks is acceptable.  Don't give up on it until you've tried.

Dave Wise

>-----Original Message-----
>From: r-1051-bounces at mailman.qth.net 
>[mailto:r-1051-bounces at mailman.qth.net] On Behalf Of Al Parker
>Sent: Sunday, September 30, 2012 1:17 PM
>To: R-1051 Discussion Group
>Subject: Re: [R-1051] Megacycle synthesizer
>
>I don't think it was from a C, but an earlier model.  IIRC 
>there wasn't 
>much dif. later, but early wouldn't plug and play in a later rcvr.
>
>Al, W8UT
>www.boatanchors.org
>www.hammarlund.info
>
>"There is nothing -- absolutely nothing -- half so much
>worth doing as simply messing about in boats"
>Ratty, to Mole
>
>On 9/30/2012 3:43 PM, John Gibson wrote:
>>    I have a problem with my R1051/C. I bought it some 10 
>years ago for $140
>> and it has worked fine until now.
>>   The problem is that it will not receive any 6mcs 
>frequencies. I traced the
>> fault to the megacycle synthesizer module, where the 
>23.498120 mcs crystal
>> has become duff. A new crystal will cost $35 but I do not know how to
>> specify its properties so that the crystal company can make a correct
>> replacement. Does anyone have the specs? Thanks.
>>   Alternatively and hopefully, someone has a parts set and 
>would sell me
>> this synthesizer. Thanks again.
>>    John Gibson