[R-390] R-390 digital readout

[Larry H]

Jose,  The R390A uses a 17 mh 1st oscillator for below 8 mh.  The 2nd
crystal oscillator is always used and generates 24 different frequencies
for each of the 32 bands.  The VFO (3rd osc) generates a frequency between
2.455 and 3.455 mh, depending where the rx is tuned at in each 1 mh band.
Have fun.

Regards, Larry

On Sat, Apr 13, 2019 at 2:04 AM jm <josemic at gmail.com> wrote:

> Many thanks Larry.
>
> I have two frequency meters in my hd180a. The first one for the double
> conversion offsets 455 kc. The second one, for the triple conversion
> offsets 3035 khz. I switch from one to the other depending on the band.
>
> But I realise that in the case of the 390 is particularly complicated.
>
> Regards
>
>
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> El sáb., 13 abr. 2019 a las 9:58, Larry H (<larry41gm at gmail.com>)
> escribió:
>
>> Jose, the R390's are dual or triple conversion depending on the received
>> frequency and therefore are a big challenge for a designer of a digital
>> readout system.  There is no one point where one composite oscillator
>> signal could be obtained for what you want.  Someone made one a few years
>> ago, but have not seen it lately.  You might search the R390 archives for
>> info.
>>
>> Regards, Larry
>>
>> PS:  The subject line of your original post is meaningless - please fix.
>>
>> On Sat, Apr 13, 2019 at 1:01 AM jm <josemic at gmail.com> wrote:
>>
>>> Hi fellows
>>>
>>> I use a frequency meter with my tube receivers. Every set has its
>>> peculiarity but until now I have managed with the HQ-180, Transoceanic
>>> (transistors) and Hallicrafters sx99.
>>> The trick is to locate the oscillator signal,  offset the IF and the
>>> thing
>>> works.
>>> But... what about the 390? variable IF, lots of crystals. I have to
>>> confess
>>> that I'm lost.
>>>
>>> Is there an easy way to connect the frequency meter in a point in which
>>> the
>>> oscillator signal could be found for all mhz positions?. What  would be
>>> the
>>> IF value  to offset ?
>>> I know that the challenge in this receiver is to obtain the maximun
>>> sensitivity and precision via calibration but that's not my league yet
>>> and
>>> meanwhile I think that a good solution is the frequency meter.
>>>
>>> Regards and sorry for a beginner's question.
>>>
>>> Jose
>>> EA8DCP
>>>
>>>
>>>