[ARC5] OT: Hally Instability.

[Fuqua, Bill L]

  Now, my SX101A was quite stable. It was my first real SSB hamband receiver.
However, the SX100 I had was terrible and bad microphonics in the local oscillator.
I think part of the problem was trying to jam to much into such a small package.
After going to crystal controlled oscillators in first conversion things improved considerably.
   I was surprised that my HQ110 was as good as it was. I could drop it a half inch and
no microphonics. 
73
Bill wa4lav

________________________________________
From: ARC5 [arc5-bounces at mailman.qth.net] on behalf of David Stinson [arc5 at ix.netcom.com]
Sent: Saturday, November 14, 2015 10:26 AM
To: Paddy Ryan; arc5 at mailman.qth.net
Subject: [ARC5] OT: Hally Instability.

I'm not doubting anyone who says their Hallys were stable.
I do know in 40+ years of hamming, I've handled dozens
of them and never seen a single one from the "ham"
market line that didn't show mechanical instablilty
and "wibble-wobbles" above about 12 MC.
Is it possible this was some sort of aging-related
design flaw that a few were spared?
Has anyone ever done a through investigation
to find the root of it?  Coils mounted on a long
bandswitch that will transmit shocks like a
tuning fork always seemed a candidate to me.
Most likely there are multiple causes.

73 D.S.

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