[Boatanchors] Halli SX-111

[rbethman]

Actually, I haven't had that problem in a VERY long time.  Then again, 
the folks I have purchased from are either folks that wouldn't go inside 
because they had no clue.  They were selling Dad's old gear, OR I 
purchased from other Amateurs that ALSO were communications Engineers, 
such as the late WC3K, Bill Breshears.  He was a satellite comm engineer.

I got picky after bailing out folks that I was Elmering, out of a pit 
because they bought a "miracle" radio for super cheap!  Yep!  Usually 
one hacked and burned by an 11mtr type.

So my specific experience came from one that was working on the spot at 
purchase, and Bill felt real bad about the BBODs.  I had to tell him to 
relax as they came that way from the factory.  Bill took such care, that 
each radio I EVER got from him came with the original manual.  The sole 
exception was one R-390A.  There are more than enough manuals for them, 
AND it was in his receiver line-up when I walked into the shack.  He had 
it on and working gang busters!  That's just how he was.

The SX-99 I got from "Dad's" old bench worked.  It DID need to be 
touched up.  I did so.  It works just fine!

Bob - N0DGN

Carl wrote:
> At first guess Id say the apparent reason is realignment of that 
> section as components aged. And many ham alignments were done with 
> insufficient knowledge and equipment as we all know. And then stored 
> cuz it never worked right again.
>
> When was the last time you bought one that wasnt misaligned in at 
> least one stage? Unless it came from a truly qualified owner.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- From: "rbethman" <rbethman at comcast.net>
> To: <boatanchors at mailman.qth.net>
> Cc: "Carl" <km1h at jeremy.mv.com>
> Sent: Sunday, August 23, 2009 1:59 PM
> Subject: Re: [Boatanchors] Halli SX-111
>
>
>> Carl,
>>
>> My experience is indeed the 50kc IF and in the 50.5 kc IF in 
>> specifically in the SX-101s.
>>
>> I began replacing them one at a time.  Then test for function.  I 
>> changed one that was a stage bypass cap and the receiver stopped 
>> working.  I went back, put the pink Tiny Chief back where it just 
>> came out of and got the receive back.
>>
>> I'm not sure if it is inductance or resistance.  I do not have a 
>> highly outfitted bench as some do.  Some things I have to either 
>> calculate or best guess it.  This IS frustrating to say the least.
>>
>> Roy Morgan has also commented on this VERY same thing.  Where in nine 
>> years of archived E-Mail?  I have no clue!
>>
>> It isn't an absolute thing, just something to be aware of.
>>
>> Bob - N0DGN
>>
>> Carl wrote:
>>> Do you have any specific examples Bob?  The only Ive heard mentioned 
>>> is in 50 kc IF switched filters and even that is highly suspect.
>>>
>>> I suppose one could measure the inductance and compare to the 
>>> various modern film caps. Or take it a step further by breadboarding 
>>> a filter and then trying various caps while watching the shape on a 
>>> VNA.
>>>
>>> I prefer the change them all approach as I dont want to go back in 
>>> later as any paper cap is guaranteed to leak sooner or later. Most 
>>> likely sooner as they get subjected to heat and voltage again. 
>>> Remember that many so called "fully operating" radios were stored 
>>> for decades which slows down the process.  Ive noticed no change in 
>>> filter curves in a SX-71 or SX-100.  My SX-115 was built with disc 
>>> ceramics
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>> ----- Original Message ----- From: "rbethman" <rbethman at comcast.net>
>>> To: <boatanchors at mailman.qth.net>
>>> Sent: Sunday, August 23, 2009 1:19 PM
>>> Subject: Re: [Boatanchors] Halli SX-111
>>>
>>>
>>>> Dick,
>>>>
>>>> Even "some" of the original REAL BBOD's need some thought given before
>>>> simply replacing.
>>>>
>>>> It appears that they had some characteristics that made their use in
>>>> bypass a little unique.  Several folks have had nothing but trouble 
>>>> with
>>>> the complete removal of all BBODs.  I've only replaced those in my
>>>> SX-101 MkIII that were in a critical circuit that would cause circuits
>>>> to llet the smoke out.
>>>>
>>>> Other than that, There are still a lot of radios that have them 
>>>> from the
>>>> original installation and work fine.  Sometimes I check to see what
>>>> shape they are in by lifting one leg and running my C-3 capacitor 
>>>> tester
>>>> on them.
>>>>
>>>> It is somewhat a darned if you do and darned if you don't.  When in 
>>>> the
>>>> IF area, don't simply go crazy.
>>>>
>>>> As to the "second generation", I think you are referring to the pink
>>>> ones.  They are NO different, and are original.
>>>>
>>>> I've got that same mixture in the HT-32 and the SX-101 MkIII.
>>>>
>>>> Both radios work fine.  Still!
>>>>
>>>> Bob - N0DGN
>>>>
>>
>
>

-- 
+------------------------------------------------------------------+
|             AM Amateur Radio Operator    NØDGN                   |   
+------------------------------------------------------------------+
| Bob Bethman                \\\|///     " The absence of a danger |
|                           \\ ~ ~ //      signal does *NOT* mean  |
| rbethman at comcast.net      (/ @ @ /)      that everything is OK " |
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