[ARC5] Radios and the Canal

[Richard Knoppow]

----- Original Message ----- 
From: "Joe Connor" <joeconnor53 at yahoo.com>
To: "Jim Haynes" <jhhaynes at earthlink.net>; "Roy Morgan" 
<k1lky at earthlink.net>
Cc: <arc5 at mailman.qth.net>; "Robert Eleazer" 
<releazer at earthlink.net>
Sent: Saturday, May 11, 2013 8:18 PM
Subject: Re: [ARC5] Radios and the Canal


The S-27 is a great receiver. It covers 27.8 mhz to 143 mhz, 
which includes the modern FM broadcast band. Like the SX-28, 
it is rugged, well-made and has audio to die for. I'm 
currently restoring one.

The S-27 is similar to the S-36. Many S-36s are mistakenly 
seen as S-27s. When Hallicrafters began producing S-36s for 
the military, it used up its stock of left-over dial bezels 
labeled "S-27."

Joe Connor

     My S-36 does not have particularly good audio.  It was 
partially rebuilt by someone before I got it and I am not 
sure what circuit changes may have been made.  At the moment 
I have the dial gear apart. This was done in error. I 
thought it necessary in order to repair a cracked gear, it 
wasn't but was done.  I just have to sit down and assemble 
it.  I can fix the cracked gear with super-glue.  Once I 
have the dial mechanism fixed I can see what I can find in 
the electronics.  The set always acted like it could not 
take the wide deviation of commercial FM stations although 
it sounded fine on TV stations  (use a narrower deviation). 
I now  think this may have been caused by the IF alignment 
procedure in the handbook.  The IF's have two selectivity 
steps which I think are undercoupled and overcoupled.  Like 
some other expanding IF's used by Hallicrafters the 
expansion is not symmetrical. If I am right a careful 
alignment with due attention to keeping the expansion 
symmetrical with respect to the discriminator may help. 
What I really need for this thing is a sweeper.
     The sensitivity is pretty fair. Beside FM broadcast and 
TV sound I used to listen to the aircraft landing at Van 
Nuys airport when I lived near it.  It was scary to find out 
just how many near misses there were.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com