[Test-Equipment] Mesurements Corp Model 111-B question

[Richard Knoppow]

----- Original Message ----- 
From: "Glenn Little WB4UIV" <glennmaillist at bellsouth.net>
To: "Richard Knoppow" <1oldlens1 at ix.netcom.com>; "Discussion 
of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Saturday, July 16, 2011 1:38 PM
Subject: Re: [Test-Equipment] Mesurements Corp Model 111-B 
question


> Send a copy of the schematic to International Crystal.
> They can determine the proper crystal from the circuitry.
> If you determine the capacitance and get it wrong, it is 
> your problem.
> They can eliminate the guess work.
>
>
>
> 73
> Glenn
> WB4UIV

      I have a handbook for it, if I can find it, and could 
send the schematic. No handbooks exist at BAMA or other free 
sources.
      I think the postage for a round trip for the whole box 
is more than the thing is worth.
      I tried measuring the capacitance at the crystal 
terminals with a Boonton Q meter and with a Boonton RX 
meter. Neither gave me a meaningful reading. A replacement 
crystal I got from someone else is off frequency. It 
measures the same on the calibrator, a counter with a 
crystal tester, and on a Millen Grid Dip Meter, all the 
same. I also get on-frequency readings from the crystal 
tester on miscellaneous crystals including crystals for both 
a Collins R-388 and Drake R4xB which makes me think the 10 
mhz standard crystal is probably a 35pf (or is it 32pf) 
crystal.
     This was a useful box when it worked. The trouble is 
definitely the crystal, it oscillates with other crystals.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com