[Milsurplus] BC-221 types

[J. Forster]

Actually, I have an AK. The cals are spot on on one band, but there is
insufficient range in the 'Compensator' to hit the marks on the other ban.
Yes, I do have the original cal book.

The only thing I can figure is the inductor has decreased in value. No, I
have no idea why.

-John

=================



> Hi
>
> Ultimately the whole device depends on a couple of things:
>
> 1) The zero of the master crystal (adjustable so not an issue if you have
> calibrated it).
> 2) The repeatability of the tuning capacitor (I doubt it will change, but
> gears / bearings might wear).
> 3) The value of the inductor (ceramic / copper so probably pretty stable)
>
> So, yes, they should stay pretty good for quite a while if properly cared
> for. The issue is weather the second and third (and fourth) order effects
> pile up or not

>
> Bob
>
> On Jul 26, 2013, at 7:36 PM, Bill Cromwell <wrcromwell at gmail.com> 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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