[NJARC] Practical Antenna Systems

Sun Aug 12 21:35:54 EDT 2018

Hi Jim,

    I'm almost finished with a SX-42 restoration.  I just need to get a line cord on it and double check some other things.  This was a real PITA to restore.  Aside from the hard to get to caps, the last owner(s) who worked on it tacked the cap leads to the terminals rather than make a solid connection.  Now it's all back to normal.  The tuning mechanism is perfect and the only real cosmetic thing I have left is to find paint for the band spread escutcheon.

    The SX-42  had prominent place in quite a few movies.  Take a look at the movie THEM sometime.  It's probably one of the best views you can get of it.  If I remember correctly, there was a S-40 and another Hallicrafters in there.  For a communications receiver from 1947, I can't agree more on the good audio it had.  I just need to find the R-42 speaker.  In the meantime, I'll use the R-46.

Regards,
Joe Devonshire

-----Original Message-----
From: Jim Whartenby <antqradio at sbcglobal.net>
To: Al Klase <ark at ar88.net>; njarc <njarc at mailman.qth.net>
Sent: Sun, Aug 12, 2018 8:50 pm
Subject: Re: [NJARC] Practical Antenna Systems

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Al, ever try an SX-42 on FM?  Seemed OK to me and pretty good audio with p-p 6V6s!
Jim

I wonder why people argue over the 10% of their differences and ignore the 90% they agree on?

 From: Al Klase <ark at ar88.net>
 To: njarc at mailman.qth.net 
 Sent: Sunday, August 12, 2018 10:32 AM
 Subject: Re: [NJARC] Practical Antenna Systems

    Hi Jim,

    FM broadcast is a considerably different environment than AM.  The    wavelength is 100 time smaller, and the background noise is very    low.  One of the primary bugaboos is multi-path reception.  If you    antenna doesn't have a reasonably clear shot to the transmitter, you    pick up multiple reflections off various objects.  (including    passing aircraft.)  Because the arrival times vary, the signals    cancel out, causing deep fades and noise.  Problem is similar to    "ghosts" on analog TV.

    The four-element Yagi you linked to is probably as good as it gets.     It may drive you to include a rotator if you listen to stations from    different directions.

    Omnidirectional antennas can work pretty well if you get them up    high, and in the clear:  AMAZON      AGAIN
    I have a similar antique  "turnstyle" in my attic, here in Jersey    City, that works much better than rabbit ears or twin-lead dipoles    located at the radio.

    One of my long-term frustrations is that I've never encountered a    tube-type FM radio that was any damn good compared to cheap    21st-Century sets.  That includes the famous Marantz 10B, built-in    oscilloscope and all.

    Hope that help,
    Al

On 8/11/2018 9:34 PM, Jamespdoranjr---      via NJARC wrote:

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      These are very cool; they are all for AM and SW.  any suggestions      for FM?  What about these      
https://www.amazon.com/dp/B00NRHAV2K/ref=cm_sw_r_sms_c_api_w44BBbW7N8DY1

Sent from my iPhone

-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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