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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: Sat, 12 May 2018 21:35:43 -0700 (Pacific Daylight Time)
Cc: CRTech <crtech@crtech.org>
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References: <alpine.WNT.2.10.1805111649050.3300@Lyle-Dell-D630> <259A7239-C5DF-44A0-8432-9AA6580D3D10@bu.edu>
User-agent: Alpine 2.10 (WNT 1266 2009-07-14)
Thank you Michael, Jim, Kevin, and Ira for your comments today.

As hinted in my request below, I'm inclined toward coax with 7/16" DIN connectors and being RF tight in the transmitter shack (an insulated shipping container). Reason being there will be a computer or two in there along with other potentially sensitive equipment. There's already too much RF floating around from the old MW-5 transmitter where the coax runs through a hole in the cabinet to terminals inside the rig. The tower is a couple hundred feet away with the ATU next to it. Though the MW-5 has been a workhorse, it is available for parts.


On May 11, 2018, at 8:21 PM, 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
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Sidekick SCA generators - 67/92kHz-checked and calibrated
--------------------------------------------------------------
  Lyle Henry, CPBE  THE RADIO DOCTOR  K9DKW  Los Angeles, CA
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Follow-Ups: RE: Re: AM antenna switch for 5kW ?
("Bill Hurne" <billhurne@pilgrimradio.com>, 14 May 2018 17:53:45 -0000)
References: AM antenna switch for 5kW ?
(RADIO DOCTOR <lylehenry@fastmail.fm>, 12 May 2018 00:20:15 -0000)
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