[MRCA] T-368 T/R

[Mike Murray]

Hello Dennis,
Let me take these in order:
See below each question.
Thanks for your help!
73
Mike

--- On Sat, 10/31/09, mac <w7qho at aol.com> wrote:
> Based  on your short report I
> would have the following questions:
> 
> First off, which breaker(s)  are you kicking, one on
> the wall of your shack or either one or both on the PS
> chassis?  Overload relays not kicking in?


Yes, it throws my circuit breaker on the wall of the shack.
I have toggled the overthrow relay each time out of habit now, and I assume the overload relay kicks in. I suppose I should not ass-ume. Will find out for sure.



> Do you have the problem if you key the rig when in the
> "TUNE" mode?  If it starts up OK in TUNE will it then
> tolerate being switched to "RUN"?

I did not have the issue in TUNE, and it does tolerate RUN mode. 
It is only when I key the rig and use the T-3's external receiver antenna jack with the R-4B in Standby.  
For now, I use a totally separate receive antenna for the R-4B as a workaround solution.


> 
> Work OK into a dummy load?

Yes.

> 
> Do both antennas present a 50 ohm resistive load to the
> T-368?

Well, I'm only using one antenna for the T-368, and yes, it is a 50 Ohm load as measured by an antenna analyzer.
I may have been vague in my description of the receive antenna. When the rig kicked off, I was using the external receive antenna jack (towards the rear next to the transmit antenna coax connector) with a jumper coax to the R-4B.

> 
> Dennis D. W7QHO
> Glendale, CA
> 
> **************
> 
> On Oct 31, 2009, at 1:57 PM, Mike Murray wrote:
> 
> > Hey Guys,
> > Great hearing some of you this morning on the net.
> > Thank you all again for a very fun time at MRCA in
> Gilbert!
> > I look forward to attending again.
> > 
> > I'll have two questions today. One regarding my T-3,
> and the other "under separate cover" regarding my new T-195
> which some of you saw at Gilbert.
> > 
> > First question:
> > I thought I had things squared away with the T-368-E
> this morning during the net, but I was clearly mistaken.
> > Transmitter was FB after warm-up, during my check-in,
> and for my first round in the net. As soon as Ted handed it
> off to me for my second round, I put my Drake R-4B receiver
> in Standby and keyed the mic.
> > I immediately threw my mains breaker.
> > Reset all and the same thing happened when trying to
> break back in moments later.
> > In an attempt to eliminate possibilities, I discovered
> that if I used an outside antenna for the Drake receiver and
> NOT the one used by the T-3, then I could transmit without
> throwing the mains.
> > 
> > I *think* Ted had mentioned that the T/R relay
> sometimes goes bad or is weak in a T-3.
> > Do you guys think this has happened in mine?
> > 
> > Thanks in advance to all!
> > 73
> > Happy Halloween!
> > Mike
> > KW4HF
> > Chapel Hill, NC
> > 
> > 
> > 
> > 
> > 
> >
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