[Hammarlund] HQ-129x - Xtal Calibrator Puzzlement

[Barry H]

Hi Ken, John, & gang:

I pulled the chassis and there's good news, bad news and more puzzlement news.

The good news is that the xtal calibrator is definitely ID'ed as an 
FC-135-C -- has the orange Hammarlund label.

The bad news -- the KV-3 rattles when shook -- so I join Ken in having a broken glass xtal in there.  I haven't opened up the can -- that will take some surgery.

The puzzlement news -- still no switch and the wiring doesn't make much sense to me.

There are four leads -- all the same orangy-red color.  Maybe they were precut to different lengths and identified by length for installation purposes.  Here are the hookups as I can fathom them.

1.  Ground
2.  6SS7 in front of can -- looks like pin 7 -- nearest filament voltage pickup source - confirmed with meter.
3.  Inboard pin on relay socket -- the unswitched side -- not the send/rec. switched. side.  I can't fully compare with the schematics, but there is a long run going to the power supply.
4.  10-16 mHz band antenna coil

No way to switch it -- it was hooked up to B+ full time.  I thought maybe the whole send/receive/relay situation was rewired, so checked with a DVM -- That lead is hot with B+ regardless of the position of the send/rx switch.

What kind of sense does that make?  Why would anyone want a full time 100 kHz calibrator?

Barry 


W4AWM at aol.com wrote:

>Hi Barry,
>
>I have just been through my extensive collection of Hammarlund literature and 
>the only thing I can find is reference to any calibrator accessory is the 
>HC-100 calibrator which is recommended for installation in HQ and SP-600 
>receivers. There was a particular model, number 38657-G2 for the HQ-129X and HQ-140X. 
>It sold for $17.95. Apparent date of manufacture was 1956.
>
><snip>
>
>73,
>
>John,  W4AWM
>  
>
John, the FC-135C is quite a bit older than the HC-100.  I found one in 
an old SX-28 that I picked up in a junk shop.  The owner had installed 
it...partially....with some of the leads wrapped around pins of various 
tubes to pick up voltage and also to output the signal. 

Barry, he had attached an old telephone switchboard switch as an on/off 
switch.  The switch was in the darkest colored lead (green?) coming out 
of the FC-135C.  The switch appeared to ground the green lead. 

Unfortunately, my FC-135C had the glass tube crystal and the glass was 
broken and one of the leads to the crystal wafer had been broken off.  
If anyone has for sale one of the glass or metal tube 100kc crystals 
that fit the ft-243 size socket (such as the Bliley KV3 100kc rock), I 
would appreciate hearing from you. 

I can't find any literature on the FC-135C either.  If someone comes up 
with anything at all...even a hand drawn schematic, please send it along 
and I'll put it on BAMA.

Does anyone know who owns the web pages at 
http://eshop1.chem.buffalo.edu/hammarlund.htm ?  It looks as though he 
plans to post some information on the FC-135C.  If we knew who he is, 
perhaps we could get him to post the info that he has.

73,
-- 

Ken K4XL
k4xl at arrl.net

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