[R-390] VFO end point off 17 KHz

[David Olean]

I also just found that Surplus in Nebraska has them also and thanks for 
your efforts too. I asked my brother if he has a 15 MHz crystal. He 
might, so he will look tonight and let me know.  He is K0ZK and is a 
QRPer with a huge junque box. I showed the R-390A to him today and he 
was impressed with the looks. I painted the white lines on the knobs 
while he was here. That came out great, so this evening is set for 
either re aligning the thing or finding out why the carrier meter is NG 
and the RF gain control seems slightly messed up. I might have broken 
something when I had the front panel off.

Thanks again for everybody's help.

Dave

On 11/2/2019 9:19 PM, comcast wrote:
> dave
> try surplus sales of nebraska.   i see in their online caralog they have a 15 mhz hc6u for $20.
> jeff kg2bz
>
> Sent from my iPhone
>
>> On Nov 2, 2019, at 2:12 PM, Perry Sandeen via R-390 <r-390 at mailman.qth.net> wrote:
>>
>> Mouser sells a variety of crystal configurations and some are the HC-6U(?) physical package.  15 MHz will (likely) be a 3rd overtone.  They are cheap enough if the one you'd buy won't work on all the overtones needed another one might.
>> Regards,
>> Perrier
>>
>>     On Saturday, November 2, 2019, 6:48:25 AM PDT, David Olean <k1whs at metrocast.net> wrote:
>>
>> Hello Mr. Bottled Water, (Perrier)
>>
>> OK on all the advice. It sure does sound like there is something wrong,
>> but with ferrites that are 50+ years old, you can get some significant
>> drift too. I have an old 144 MHz Tecraft xmtr from my boyhood that had
>> all the slugs drift so far down that it stopped working. I had to modify
>> all of the multiplier coils to get it back on 24 and 72 MHz.  That is a
>> pretty drastic change.  That is what prompted me to diddle with the end
>> point coil. So now it is working great with nice linearity across 950
>> kHz and only 500 Hz off at one end.  I'll come back to this problem
>> soon.  Getting the PTO out is sorta simple, so I will order some new
>> capacitor parts and come back to it on some cold winter night. In the
>> mean time, I am re aligning the entire set and fixing a few problems.
>> The carrier meter has stopped working and the RF gain control is acting
>> funny. This R-390A had the antenna relay removed and an (ugh) SO-239
>> connector installed in its' place. I just bought a relay and am looking
>> for the wires to re install it, but can't find them ?  I am not sure,
>> but think they must have been clipped and removed. I'll run new wires to
>> the rectifier and get it all working.
>>
>> I also found that the 15.000 MHz crystal has died.  This only affects
>> the 27 MHz band.  It will not oscillate, or if it does, it is very weak.
>> I need a replacement crystal. I found a 7.500 MHz one in my junque box
>> and it actually works, but output is a bit low and injection is not
>> enough.  Fair Radio does not list any. I am looking for a replacement.
>>
>> If anyone has a Cosmos PTO I would be interested in getting another one
>> to work with as well.  They do get addicting.
>>
>> 73 Dave K1WHS
>>
>>
>>> On 11/2/2019 5:42 AM, Perry Sandeen via R-390 wrote:
>>> Yo Bubba Dudes!,
>>> I agree about returning the end point coil to its original 3 turns.  I disagree with fixing the drift with adding caps.
>>> W
>