I have converted a few to 6 meters,the transmitters were no
problem.However,I had to mod the helicals in two of them to get
acceptable sensitivity at 52mhz. This involved removing the first two
helical coils and shorting two turns at the top. You will need heavy
duty soldering heat!
As far as the base station power amps go,if it has the full continuous
duty heatsink it will run at near rated power without much problem. I
would use a fan for repeater duty,my vhf has been running 100 watts for
27 years without a single problem! Good luck!
Doug Bade wrote:
> The main problem to watch for is heat/swr issues on the PA as it
>is potentially going to cook itself at full rated power with a high duty
>cycle... It will make full power and full sensitivity in 52/53 mhz, but I
>would de-rate the PA by a bit to protect it if it is going to be on a lot.
>I have not seen one which did not tune up on 6m just fine.. and I know of
>at least one which left the factory in the late 70's tuned on 6m... 52.525
>as I recall on channel 2.... repeater splits in others...
>
>Doug
>KB8GVQ
>
>
>At 10:35 AM 12/22/2004, you wrote:
>
>
>
>>I may have access to a Mastr II 100watt low band base, 42-50Mhz, which
>>I'm looking at converting to a 6m repeater. I don't see anything
>>specific to the LB models on the RBTIP web site, unless I'm missing it.
>>This leads me to believe that other than replacing the crystals and
>>tuning it up, there arent any component changes needed? Can anyone
>>verify this? Also, is it safe to run the power out at around 50-60 watts
>>on these PA's without killing them? TIA to all!
>>
>>Kevin
>>K2KMB
>>
>>
>
>
>
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