[MRCA] AN/GRC-106 on LSB?
Mike
mmcauley at cox.net
Fri Apr 22 20:31:40 EDT 2022
Makes sense. Lots of good info on your website too! ThanksMike
-------- Original message --------From: "B. Smith" <smithab11 at comcast.net> Date: 4/22/22 3:32 PM (GMT-07:00) To: mrca at mailman.qth.net Subject: Re: [MRCA] AN/GRC-106 on LSB?
The "voltage spike" mentioned below can ruin your day. It is a
recommended procedure to turn off your comm and other sensitive
equipment when starting or stopping. Info can be found:
http://k4che.com/M151A1-Electrical/PRCpwr.htm
Z
On 4/22/2022 2:30 PM, KA1LHZ wrote:
Someone in the group described the GRC-106 in a shelter as
sounding like a blender inside a tornado. I've used it during
Field Day, as well as numerous rallys and shows. I've worked 30
countries as well as 40 states and provinces with it. I use a
motorola carbon microphone element in an H-250 handset. The
regular microphone sounds like you're talking with a sock in
your mouth. Very few issues with it. The 3 phase (???REALLY??)
cooling fan on the amplifier heat sink got stuck occasionally
after sitting over the winter. I lubed it with a few drops of
5W-30 Mobil1 oil, and it hasn't stuck since. That couldn't
possibly have been because the almost 50 year old lubricant
turnedto sludge... I also had the power input feedthrough
capacitor short due to a voltage spike from starting the
truck while the radio was on. The previous owner
helped me replace that. I should get out ther and blow the dust
out of the transistors and get it on the air now that the snow
has melted in the compound. It's fun keeping a piece of history
on the air. My friend Ken W1KRT told me he saw these radios
running RTTY 24/7 in SE Asia when he was there. They're capable
of 1 KW output but derated so Sgt Snafu couldn't screw them up
too bad when trying to get traffic out while under fire and
tuning a bedspring. You can see my shelter in my USAF M-37 on my
QRZ page. Hope this helps.
73
DE KA1LHZ
On 4/21/22 20:22, Mike wrote:
Thank you Steven. Your information is well
received!
I don't have the -106 set just yet, but I am
exploring it's capabilities before I do ever pull the trigger
Can you tell me... is there anything you dislike
about the 106, or something you wish it could do but doesn't?
Basically I'm looking for any reasons why
someone wouldn't want one (besides the obvious like bulk or
weight)
Thanks...
Mike
KD7VRG
-------- Original message --------
From: KA1LHZ <sboard.ka1lhz at gmail.com>
Date: 4/21/22 4:24 PM (GMT-07:00)
To: Mike <mmcauley at cox.net>
Cc: mrca at mailman.qth.net
Subject: Re: [MRCA] AN/GRC-106 on LSB?
Mike
I've been looking to do this with my GRC-106A too. There used
to be someone who made the xtal filter in asia, but sadly no
more. From what I gather you use a DPDT shielded relay with a
24v coil to switch the original USB xtal filter with a LSB
filter. The coil is connected to the front panel switch to
change when the FSK position is selected ( that's what I was
told). I did find a LSB xtal filter for another radio that
supposedly works with the IF frequency of the RT-834. The
parts are sitting in my shelter with the radio, yet to be
installed. The parts could fit in the module or nearby. Sorry
to not offer more specific information. I'm still in the
theoretical stage until I pull out the soldering iron. I'll
look at the filter and give you more info and pics. Home with
the Wuhan flu, so have lots of time to wait on SCØUT and stuff
like this.
73 DE KA1LHZ
On 4/21/22 17:29, Mike wrote:
Hello,
I have a question about the GRC-106 (RT-834)
I'm led to believe this radio can be modified to work on
LSB. Is it just the LSB crystal filter that
is needed? Does this ADD LSB and still retain the USB
capability, or does it REPLACE the USB
with LSB?
Is there anything else that needs to be done besides
installing the filter? How difficult is it to do?
Thanks...
Mike
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