[R-390] R390A SSB Reception

[John Vendely]

If you're building your own product detector and crystal-controlled BFO, 
a simple and easy expedient to avoid expensive low-frequency crystals 
would be to order relatively inexpensive crystals at around 4.55 Mc and 
divide by 10 to 455 kc.  A common bi-quinary decade counter such as the 
7490 or 74HC390 would suffice.

73,

John K9WT

On 8/10/2019 9:51 PM, Stan Gammons wrote:
> Hi Perry,
>
> Long time no type.
>
> Yes, low frequency crystals are expensive. QuartSLab wants 100 to 200 
> pounds each to make them. Forget that. The BFO and varactor diode 
> ideas are good options. It would be way overkill, but I also thought 
> about a DDS BFO built using an Arduino. I have all the parts to make 
> one. The Treetop adapter is also an option.
>
> Thanks again for all the suggestions.
>
>
> 73
>
> Stan
> KM4HQE
>
>
> On 8/10/19 5:01 PM, Perry Sandeen via R-390 wrote:
>> Yo Bubba Dudes,
>> Wrote: Where can I get low frequency crystals.
>> With the near impossibility of getting reasonable priced low 
>> frequency crystals you might want to consider the SSB adapter from 
>> Treetop circuits.  It uses the A's BFO but has all the modern 
>> circuity for fast attack AGC and such.
>> He is a Canadian ham that sells or ebay.  Besides the A, he has ones 
>> for the R390/URR, R392 and R388 models.
>> He has also developed one specifically for the SP 600.
>> Prices are a little over $100.
>> Regards,
>> Perrier
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