[MRCA] AN/GRC-106 on LSB?

[KA1LHZ]

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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