[Boatanchors] SX-42

Wed Jul 14 09:41:38 EDT 2010

The problem with any low frequency ferrite core IF is that the core 
permeability changes slightly over time. This almost makes a sweeper and 
scope mandatorty to align to the new IF frequency.

Hallicrafters and National both suffer from this and some sets of no 
particular model seem to stay put. However the National 230kc cup cores are 
by far the worse to try and get back to spec, it usually requires careful 
selection of silver micas of 1-2% tolerance.

Carl
KM1H

> Bob,
>
> You will definitely notice a "night and day" difference between your 
> SX-110 and an SX-100.  When I first set up my Ranger/Desk KW I paired it 
> with a National HRO-50 like the Johnson advertisement.  One stint as net 
> control for the Midwest Classic Radio Net showed me the selectivity of the 
> HRO-50 wasn't quite up to handling weak AM stations with lots of QRM and 
> QRN and for a number of sessions I used my SX-100 which worked very well. 
> The combination of selectable sideband on AM along with several degrees of 
> selectivity worked wonders in making it easier to copy weak stations.
>
> I now use an SX-88 with the Ranger/Desk which looks and sounds nice but 
> requires bumping the bandspread tuning instead of flipping a switch to 
> choose AM sidebands.  Although the higher Q IF transformers should give it 
> a little better selectivity curve than the SX-100 it isn't as convenient 
> to use.  But I wanted one for years, it looks cool and sounds great so it 
> is staying where it is and my SX-100 is now hanging out with a Johnson 
> Adventurer.
>
> When you get the SX-100, get/use a proper signal generator to align the 
> 50.75 Khz. 2'nd IF since this is critical to proper performance.  If you 
> find that one (or both) of the 2'nd mixer crystals have drifted slightly 
> you can adjust the final IF alignment frequency slightly to compensate. 
> Finally, if you have a strong 1650 Khz. broadcast station nearby you will 
> probably need to put a tuned trap on the antenna input to prevent 
> interference on the lower two ranges.
>
> Rodger WQ9E
>
>
> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net on behalf of Bob Macklin
> Sent: Tue 7/13/2010 8:58 PM
> To: Barrie Smith; boatanchors at qth.net
> Subject: Re: [Boatanchors] SX-42
>
> Back in the 60's one of my good friends had a nice SX-28. I guess I was
> spoiled by it. I've been looking for a decent SX-71 I can afford. I missed
> one last year. It was original except one small knob. But I waited to long
> and when I went back to get it was already gone. That was just 30 minutes.
>
> I have been thinking about trying a SX-100. I have a SX-110 that I think
> looks pretty good but it leaves a lot to be desired in operation.
>
> I did my novice year with an original S-38 ( the one with the real BFO). I
> was 22 then and I did not know better. I learned all about AC/DC radios 
> REAL
> QUICK! I was a USAF S/SGT at the time.
>
> Bob Macklin
> K5MYJ
> Seattle, Wa.
> "Real Radios Glow In The Dark"
>
>
> ----- Original Message ----- 
> From: "Barrie Smith" <barrie at centric.net>
> To: <boatanchors at qth.net>
> Sent: Tuesday, July 13, 2010 6:10 PM
> Subject: [Boatanchors] SX-42
>
>
>> Hello, All:
>>
>> I'm a bit disappointed that Bob doesn't like the looks of the SX-42.
>>
>> I think it looks neat!  Different, but neat.
>>
>> Have to agree about the looks of the SX-28, and I love my SX-88.
>>
>> To me, the best receiver is the one I'm listening to at that moment.
>>
>> 73, Barrie, W7ALW
>>
>> ----- Original Message ----- 
>> From: "Robert Nickels" <ranickel at comcast.net>
>> To: <hallicrafters at mailman.qth.net>
>> Sent: Tuesday, July 13, 2010 5:36 PM
>> Subject: Re: [Hallicrafters] SX-42 Pedestal?
>>
>>
>>> On 7/13/2010 6:00 PM, Bob Macklin wrote:
>>>> What's so special about SX-42s? They are not exactly good looking
>>>> units.\
>>>>
>>> Designed by Raymond Loewy, one of the best known industrial designers of
>>> the 20th century, some of us would disagree.
>>>
>>> 73, Bob W9RAN
>>>
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>
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