[Johnson] Ranger/Valiant with Xtals

[Ray, W2EC]

FYI,

The crystals I use in my Valiant II (same crystals I've owned since the 
late 50's early 60's) are standard FT-243's from the old Texas Crystal 
as well as other companies (P&R etc) of that era. They have always 
worked for me. To name a few of the transmitters I've used the same 
crystals interchangably in: Heath AT-1, DX-40, DX-60, Ranger and Valiant 
II. Nothing special about them.

73, Ray W2EC

Sherrill Watkins wrote:

> Dear Fabio: After reading the excellent comments of Mr. Ed Worst, I looked at
> the schematic of my Valiant. It has a 25 pf and a 200 pf capacitor and a
> 0.005 capacitor all connected in series. One end is connected across the
> crystal and the other end is connected to ground. The crystal and these
> series capacitors are also shunted by a 33K ohm resistor to ground across the
> control grid of the 6CL6 crystal oscillator, V3, tube. I do not know what the
> series capacitance of this is but I suspect it is very close to that of the
> Ranger? I also suspect that the E.F.Johnson Company would have designed the
> Ranger and Valiant to both transmit on the same frequency using the same
> crystal. - 73- Sherrill W. k4own.   
> 
> -----Original Message-----
> From: Ed Worst [mailto:edworst at att.net] 
> Sent: Monday, December 06, 2004 3:18 PM
> To: Fabio Liberatori; Johnson List
> Subject: Re: [Johnson] Ranger/Valiant with Xtals
> 
> 
> Hello Fabio,
> 
> When you ordered the crystals, did you specifically state that they were for
> the Ranger (or Valiant)?  Most crystals from that era were made to work on
> the frequency specified with a "correlation capacitance" of - in the case of
> the Ranger - 23pf.  This is the total capacitance that appears in parallel
> with the crystal to form a high  Q resonant circuit.  I picked the values of
> the capacitors (24pf and 200pf) off my schematic for the Ranger.  I no longer
> have a Valiant, so I can't tell if it's the same or not.  If the crystal
> wasn't fabricated with that correlation capacity, it could be off frequency,
> or not even oscillate at all in that circuit.  You might be able to return
> the crystals since everything (housing, blank, cover, springs) is re-usable.
> 
> Does everything work OK on 20m when you're in the VFO position?
> 
> Will the crystals oscillate in the 40m position?
> 
> Hope this is of some help.
> 
> 73,
> ed - k9ew
> 
> ----- Original Message -----
> From: "Fabio Liberatori" <liber.fab at iol.it>
> To: <johnson at mailman.qth.net>
> Sent: Friday, December 03, 2004 14:23 PM
> Subject: [Johnson] Ranger/Valiant with Xtals
> 
> 
> 
>>     Hello,
>>              I recently bought two 7.143 MHz xtals for 14.286 MHz use 
>>in my Johnson transmitters, but no luck... Both do not oscillate, even 
>>if they are of new production (fitted into the old FT-243 case).
>>I checked the correct position on the xtal socket, of course...
>>I did any other attempt I was able to imagine...  Cleaning contacts,
>>changing position, and so on...).
>>
>>Is my 7.143 xtal frequency choice  wrong for 20 meters use ? Do I need 
>>actually 14.286 MHz xtals ?
>>
>>Does anybody use Rangers and Valiants with xtals here on this 
>>reflector ?
>>
>>     Any suggestion will be very appreciated,
>>
>>                Fabio, I0LBE
>>Johnson mailing list
>>Home: http://mailman.qth.net/mailman/listinfo/johnson
>>Help: http://mailman.qth.net/mmfaq.html
>>Post: mailto:Johnson at mailman.qth.net
>>
> 
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>