[ARC5] BC-221 frequency meter

[Robert Jenkins]

Thanks for all the helpful info. The Xtal was working before. The BC-221AK
after the revuild emits a signal as well as picks up my transmitter when
keyed into a dummy load.

I have attempted to dial in the cal points and I no longer receive a
signal. I will go looking at the resistors in the B+ circuit and replace
any that are open or out of tolerance.

Tnx,

Robert
KG4KGL


On Thu, Jan 2, 2014 at 2:57 AM, Fuqua, Bill L <wlfuqu00 at uky.edu> wrote:

>   It is extremely unlikely you could have damaged the crystal.
> Make sure you check all the carbon composition resistors. They change
> values over
> time. After 70 or more years I suspect that most are off, especially the
> larger value ones.
> I have seen large value carbon comp resistors become off by over 50% only
> after 10 or so years on the shelf.
> Also, the rfc in the crystal oscillator and the tube could be suspect.
>  If I recall the crystals are hermetically sealed.
> 73
> Bill wa4lav
>
> ________________________________________
> From: arc5-bounces at mailman.qth.net [arc5-bounces at mailman.qth.net] on
> behalf of KG4KGL [kg4kgl at gmail.com]
> Sent: Wednesday, January 01, 2014 7:11 PM
> To: arc5 at mailman.qth.net
> Subject: [ARC5] BC-221 frequency meter
>
> Alright before I start, you have to promise not to laugh at me.
>
> I bought this freq. meter and when I powered it up with my Heath PS-4, I
> read the wrong scale on the meter and applied ~300v B+. Oops. So I saw a
> little smoke and thought I fried one of the old fixed caps, so I recapped
> it.
>
> Now it worked at that high voltage and it works after the recap, but I get
> nothing out of it when I put it in the Crystal position. Am I right in
> assuming I have fried the crystal? Everything else works fine.
>
> Does anyone have a spare xtal they would be willing to sell?
>
> Tnx,
>
> Robert
> KG4KGL
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