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Re: AM antenna switch for 5kW ?
To: Pubtech <pubtech@lists.pubtech.org>
Subject: Re: AM antenna switch for 5kW ?
From: RADIO DOCTOR <lylehenry@fastmail.fm>
Date: Fri, 11 May 2018 20:10:39 -0700 (Pacific Daylight Time)
Cc: CRTech <crtech@crtech.org>
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In-reply-to: <1B9E7216-12C6-4E14-B607-AFDE55696117@w2xj.net>
References: <alpine.WNT.2.10.1805111649050.3300@Lyle-Dell-D630> <1B9E7216-12C6-4E14-B607-AFDE55696117@w2xj.net>
User-agent: Alpine 2.10 (WNT 1266 2009-07-14)
I suspected as much, but was a bit worried that the standard for switching might have gotten overly neat and unnecessarily pretty. 40+ years ago, my little AM stations just had knife switches on the wall. Thank you, Rob.


On Fri, 11 May 2018, W2xj wrote:

Lyle

Contactors are the norm for AM. They are usually 4 port. Kintronics is one source
http://www.kintronic.com/shop/40-amp-contactor/

And Jennings for vacuum contactors
http://www.jenningstech.com/pdf/TnB_Jen_Cat__Relays&Contactors_r4.pdf

As for the rest, contact me off list. I’ll be honored to help.
Sent from my iPhone


On May 11, 2018, at 20:20, RADIO DOCTOR <lylehenry@fastmail.fm> wrote:

What remote control switches are being used for AM nowadays? Shielded for coax or open relay(s) on a panel/board? Controllers? Automatic?

4 Port would be nice so dummy load would be connected to the
  transmitter that's not on the air.

The transmission line is a 1/2" late 1980's version of the current 1/2" CableWave (RFS) LCF12-50J.

What's best for jumpers? Should I bother with connectors or just wire it up? Transmitter will probably be 7/8" EIA output, but DIN connectors might be nice for hooking everything together. Is there a 7/8" EIA to appropriate size DIN adapter. I've never used DIN connectors anywhere.

Being an FM Guy, I've rarely dealt with real AM. Always tried to keep AM at least 50 dB down :)

Thanks mucho for your comments and suggestions.  ...Lyle


FMeXtra digital SCA systems - encoders and receivers
SCA/FM/FMeXtra radios: fixed & tunable-wood cases-nice sound
Sidekick SCA generators - 67/92kHz-checked and calibrated
--------------------------------------------------------------
  Lyle Henry, CPBE  THE RADIO DOCTOR  K9DKW  Los Angeles, CA
SCA Consultant:  Brazil, China, India, Mexico, Taiwan, SE Asia
       323-660-4690 Home/Office     213-880-4690 Mobile
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References: AM antenna switch for 5kW ?
(RADIO DOCTOR <lylehenry@fastmail.fm>, 12 May 2018 00:20:15 -0000)
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