[Milsurplus] CRC-7

[Bruce Gentry]

Bruce Gentry wrote:
> John J Mccarty wrote:
>> Hello Ben, George and All;
>>
>>
>>   I found the "orignal" conversion article in April 1958 CQ. It was 
>> done up in
>> the Surplus column by Ken Grayson, W2HDM.
>>
>>  Good news: It does not call for a sharp hacksaw.
>>
>>  Bad news: It does suggest use of a blow tourch or big soldering iron 
>> to get
>> into the sealed case. Then it suggests drilling holes in the case to 
>> allow for
>> adjustments.
>>
>>
>> 73
>>
>>
>>
>> John n9hrt
>>
>> On 1/7/2011 10:51 AM, Military1944 at aol.com wrote:
>>  
>>>  
>>> Ben:
>>> The CRC-7 was indeed Korean war vintage.  And, I recall  seeing a 
>>> ham conversion article back in those days, but I have no idea in 
>>> which  publication it appeared.  Actually I found it in Vol. III of 
>>> the Surplus  Conversion Manual series.  Warning: The article starts 
>>> with: "First, you  need a sharp hacksaw...." But it does include a 
>>> clear schematic.
>>> Good  luck!
>>> 73,
>>> George W5VPQ
>>>
>>>
>>>
>>> ------------------------------------------
>>>  
>>> Thanks George. I have the surplus conversion manual as you  say.  
>>> I dont' know how they joined to top part of the tube to the  middle, 
>>> can't think it was welded, maybe soldered with a special tool.  
>>> Anyway, after cleaning I applied power to mine and amazingly  it 
>>> still works on rx and tx. Not bad after 60 year say.  
>>> I don't think I'll try a 2Mtr mod, getting at the xtal looks  just 
>>> too difficult. I'll keep it as a working example, hi.  
>>> cheers, Ben G4BXD.
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>>
>>
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>>   
> I had one years ago that had been opened carefully with a hacksaw. The 
> screw lugs had been relocated so longer screws held it together 
> nicely. There were many aircraft instruments and gyros in those days 
> that were sealed by soldering. The repair stations used either shaped 
> calrod heaters or custom designed and shaped gas burners to open them, 
> and  a lower temperature solder may have been used.  I recrystalled 
> and tuned mine for 122.8 MC to take along in a friend's Taylorcraft 
> BC-12.   It was  more convenient  than a URC-4 in  side-by side 
> seating   because of the whip antenna.  The URC-4 worked better and 
> was fine in the tandem seated Piper Cub or Aeronca Champion. I was 
> able to stuff enough batteries into the bottom of the CRC-7 to operate 
> it continuously for about an hour, much longer if used only in the 
> traffic pattern.  Bruce Gentry
>