[Milsurplus] BC-221 types

[C.Whitaker]

de WB2CPN
Way back I built a couple of AC power supplies
for that "Freq Meter".  We stole parts from  "Tone
Keyers" made by Wilcox for the CS-390 Rec Racks.
When the real AC power supplies became available
the operators often left the back door open so's the
whole thing would run cooler.
Trivia, but for calibrating the crystal,l the upper part
(the oscillator), was wrapped in a heavy bath towel, and
a long handle screwdriver was included in the wrap.
Warm up took a while.
Clete
++++++++++++++++++++++++++++++++++

On 7/26/2013 7:36 PM, Bill Cromwell wrote:
> On 07/26/2013 06:02 PM, Bob Camp wrote:
>> Hi
>>
>> I haven't seen a lot of difference between the models. It seems to 
>> work out as:
>>
>> 1) Nice to have a calibration book that goes with the serial number 
>> you have.
>> 2) AC power versions seem to be more desirable than the "not AC" 
>> versions.
>>
>> That said, it's not real clear just how accurate a > 50 year old 
>> calibration book really is. It's still a nice thing to have. I've 
>> always liked the versions with the corrector in the coil (thermal 
>> spring and rotating loop). I'm not at all sure they work any better. 
>> They are a cool piece of technology.
>>
>> Bob
>>
>
> Hi Bob,
>
> I only have LMs - the same thing only different. I have the original 
> books for all three of them. All three of the books agree with WWV. 
> After all these years ain't that sumthin! They're still more than good 
> enough for amateur radio use. I suppose that even the BC-221s are good 
> enough, too.
>
> As for undesirable - maybe if it's been run over by a big truck....
>
> 73,
>
> Bill  KU8H
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