[Hallicrafters] SX-100 (and SX-96) microphonics

[Carl]

----- Original Message ----- 
From: "Mike Everette" <radiocompass at yahoo.com>
To: <hallicrafters at mailman.qth.net>; "'ka9p'" <ka9p at aol.com>; "Chris Kepus" 
<ckepus at comcast.net>
Sent: Sunday, November 20, 2011 9:44 PM
Subject: Re: [Hallicrafters] SX-100 (and SX-96) microphonics


Actually one thing does help:  Sit the receiver on a thick piece of foam! 
And, make sure the speaker is NOT on top of the receiver, or touching it in 
any way.  Putting the speaker on foam, if it's on the same table, is also 
necessary.

My SX-96 was so microphonic that if the gain was turned all the way up, and 
it received the slightest mechanical shock (even from a fly landing on 
top)it'd howl like a banshee.

Must be one of those designed-in trademark Hallicrafters things, like 
long-term drift is endemic to Hammarlund receivers.... (I'll probably catch 
hell for that, but it's the durn truth....)

73
Mike
W4DSE

** Most of the drift in the early SP and HQ series can at least be 
compensated. Some of the later versions either are rock solid or drifters, I 
must have been lucky with my HQ-180 as Ive never found a complete cure for 
others.

Carl
KM1H



--- On Sun, 11/20/11, Chris Kepus <ckepus at comcast.net> wrote:

> From: Chris Kepus <ckepus at comcast.net>
> Subject: SX-100 (and SX-96) microphonics
> To: "'Mike Everette'" <radiocompass at yahoo.com>, 
> hallicrafters at mailman.qth.net, "'ka9p'" <ka9p at aol.com>
> Date: Sunday, November 20, 2011, 6:51 PM
> I suppose broaching this subject is
> like beating the 1000th dead horse!!!
> (apologies to PETA).
>
> But,... since I have a nice SX-100 that mostly goes
> unused except as a
> remotely mounted monitor because of them dang Microphonics
> thingies, I have
> to ask, does anyone have a SX-100 that's not
> microphonic? If the answer is
> yes, please share whatever you did to cure it.
>
> What's a bit odd to me is that my S-76, which is one of
> favs, is not
> microphonic. Is it, a the song suggests, just
> "physical"?
>
> Listening mode back on.
>
> 73 and tnx,
> Chris
> W7JPG
>
> From Mike's message..............
> "The biggest issue I recall with the SX-96 (which I used as
> a nain receiver
> for years) is microphonics, especially on 15 and 10
> meters. If someone
> knocked on the front door at my house, it could be heard in
> the speaker.
> The next biggest was that if my foot hit the table, the
> receiver was likely
> to lose the frequency of the signal.
>
> You learned breath control when using one. That skill
> comes in handy if
> you're a swimmer, or a singer." YES!!!! LOL!!!
>
>
>
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