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Re: NAB attendees, Antenna and transmitter?
To: CRTech <crtech@crtech.org>
Subject: Re: NAB attendees, Antenna and transmitter?
From: Mark Croom <markc@newmail.kinshipradio.org>
Date: Mon, 9 Apr 2018 22:04:31 -0500
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I worked with a station that put up a VersaTune to replace one of the Telecom TFC2K 2-bay crossed dipole CP antennas. Pretty sure we bought it from Bext.

The station was on 88.3 and when the old re-purposed QEI tube box was removed and a shiny new Nautel put in its place, the station saw just how bad the Nicom antenna is at the ends of the band. I had no network analyzer to test with so I just tuned up the transmitter into the "broadband" antenna using its tune/load controls. Turned out return loss is not so good at 88.3 when you really need a fifty ohm system. So the decision to replace it with a VersaTune was made. The station put them up and I believe just tuned the thing for minimum reflected power at the transmitter metering. Worked great for them. At my urging they bought the radomes and have (to the best of my knowledge) had zero problems with the system. I want to say the TPO is about 2.7kW maybe.

Overall I wouldn't hesitate to use them again on low power systems if a client was interested.

I just installed my first BW transmitters, a couple of 600W V2 boxes on translators, so we're not pushing them. TPOs near 400 watts. So far, so good, but no track record yet.


On Mon, Apr 9, 2018 at 3:06 PM, Tim Madeira <Tim@wrgn.com> wrote:

For those who are at NAB. We will need to be replacing our antenna (25 years old and survivor of multiple hurricanes and several tower moves). Following Hurricane Maria, it is now causing us significant SWR issues. I am currently looking at the Shively Versa2une or Shively 6812B Which is what we currently have) Obviously, the 6812 has served us well, but the Versa2une was not around 25 years ago. Anyone with experience on the Versa2une? Is there anything else at NAB that seemed appealing. Obviously, snow load and radomes not an issue, but the wind sure is!

Also planning to replace our transmitter, which also suffered from the hurricane, and want to get an all in one unit that can be remotely controlled and monitored. We are currently feeding it over the internet using Barix units due to damage  to our satellite dish (150 mile an hour winds will do that!) and unless there is a better option (hint, hint, see anything at NAB?), we will continue to do that or something similar for the foreseeable future. 

References: NAB attendees, Antenna and transmitter?
(Tim Madeira <Tim@wrgn.com>, 9 Apr 2018 20:07:23 -0000)
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