[VHFcontesting] [VHF] KJ6KO V2 1296 Amp T/R switching

[W8ZN at comcast.net]

Howard,

This is 1296 with decent power, do you really want to recommend UHF connectors?????

Tthere are so many mil surplus type N relays out there that it's not worth the chance. With the inherent SWR built in to every UHF connector, at 1296 with 60-70w you could start melting connectors.


 -------------- Original message ----------------------
From: "Howard W3CQH" <hsgorden at comcast.net>
> Les,
> 
> T/R = Transmit/Receive
> 
> You will need a uhf relay with 3 contacts (depending on how much power you 
> are running and what type of connectors you are using) - the common contact 
> is the input from your antenna.  The Transmit side of the relay is the open 
> connection of the relay and that goes to the output of the transmitter.  The 
> closed side of thee relay goes to your receiver input.  So that when you key 
> the transmitter the closed side opens and the open side closes.  The relay 
> should be mounted inside of your transceiver or radio.. if you don't have a 
> mechanical relay already installed by the manufacture of your radio, you 
> probably have some switching diodes that would have to be disconnected and 
> the lines reconnected to the relay.  Or the relay could be mounted on your 
> mast in the same configuration.
> 
> I would like to suggest that you might read up on relays in the ARRL Amateur 
> Radio Handbook.. Just about every edition has information on relays..
> 
> 73's - I am sure that others will chime in on the subject.. de Howard W3CQH
> 
> 
> ----- Original Message ----- 
> From: "Les Rayburn" <les at highnoonfilm.com>
> To: <vhf at w6yx.stanford.edu>; "VHF Contesting Reflector" 
> <vhfcontesting at contesting.com>
> Sent: Wednesday, December 17, 2008 9:15 AM
> Subject: [VHF] KJ6KO V2 1296 Amp T/R switching
> 
> 
> > Please pardon yet another newbie question, but here goes.
> >
> > I recently purchased a KJ6KO V2 1296 amp from a local VHF'er, along with 
> > the
> > power supply. Hoping to increase my meager 10 watt signal to 60 watts or 
> > so.
> >
> > For those who are not familiar with this amp. You can find details at:
> > http://users.innercite.com/kj6ko/forsale.htm
> >
> > My plan is to use my Icom IC-910H as an exciter for the amp. But here's 
> > where
> > I'm running into trouble. This amp requires an external T/R relay...and 
> > this
> > is all new to me. I'm running  a single 1/2" hardline into the attic, 
> > feeding
> > a loop yagi. No pre-amp (though I do have one waiting to be installed as 
> > well)
> >
> > My questions are legion. Where do I get a T/R relay? How do I wire up all 
> > the
> > "in's and out's"? Can I still use the mast mounted pre-amp in line with 
> > this?
> >
> > Any and all help gratefully appreciated!
> >
> > 73,
> >
> > Les Rayburn, N1LF
> > EM63
> >
> >
> >
> > Les Rayburn, director
> > High Noon Film
> > 100 Centerview Drive Suite 111
> > Birmingham, AL 35216-3748
> > 205.824.8930
> > 205.824.8960 fax
> > 205.253.4867 cell
> > ------
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