[Hallicrafters] SX-100 MK2

[Dave Harmon]

More likely the wrong pot...unless you can determine that the pot is
original.

Dave Harmon
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok.


-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Pagel, Mike
Sent: Thursday, June 06, 2013 8:22 PM
To: Dave Harmon; dhallam at knology.net; Hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] SX-100 MK2

At the moment, my shack has 8 boat anchor receivers representing 8 models
from 6 manufacturers.  EVERY one of them exhibits this trait where, on a
scale of 0-10, 0-7 is there for decoration and all of the change occurs
between 7-10.  Is this a common trait to all receivers of this vintage, or
have they all had their pots replaced with the wrong type?

73, de Mike, K9UW
Amherst, WI

________________________________________
From: hallicrafters-bounces at mailman.qth.net
[hallicrafters-bounces at mailman.qth.net] on behalf of Dave Harmon
[k6xyz at sbcglobal.net]
Sent: Thursday, June 06, 2013 7:26 PM
To: dhallam at knology.net; Hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] SX-100 MK2

Hi Dave....
Yes, that's correct.
I replaced mine and the regular taper pot makes the sensitivity come on
really fast in the last part of the rotation.
I replace that pot twice before I finally woke up to what was happening.
You can probably reverse the taper using some resistors to fake out the
pot.....or use a standard pot and add the resistors to make a reverse taper.
Google how to do it....I've see that somewhere before.

Dave Harmon
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok.

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of David C. Hallam
Sent: Thursday, June 06, 2013 4:17 PM
To: Hallicrafters at mailman.qth.net
Subject: [Hallicrafters] SX-100 MK2

I have a SX-100 MK2 on the bench right now after replacing some bad
capacitors and resistors.  I was just getting ready to start alignment and
reviewing some of the old notes gleaned from various reflectors and supplied
courtesy of Roy K1LKY.  I ran across a little gem I wasn't aware of.  There
is a note stating the RF gain pot which I am taking to be the sensitivity
pot is a reverse log taper pot.  Is that correct?  I have to replace the one
in mine and used a normal linear taper pot.

David
KW4DH

--
"I predict future happiness for Americans if they can prevent the government
from wasting the labors of the people under the pretense of taking care of
them."
Thomas Jefferson

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