skipp025 wrote:
>
> Hi Lee,
>
> You get what you pay for... I found the bare kit type receiver front
> end needed a bit more help for a high rf level repeater site. I
> bought the extra helical preamp front end and it works just fine.
> Also depends on the era and type of kit receiver. Some have minimal
> amounts of helical front ends, some are pretty robust with 5 to 8
> helical cavities in the front end.
Thing is, for the same amount of money, you can either put together a
Motorola or GE station conversion, or just go out and buy a Kenwood
TKR-850. In either case, you will have a more reliable package, and a
MUCH cleaner transmitter, especially cleaner, properly limited audio
that won't splatter on to adjacent channels.
This has been a problem with all made-for-amateur repeaters except for
the Icom's. They just can't seem to make clean transmitters.
>
> There is no free lunch,
>
> Back in my early days ("wooden repeaters") I installed a kit built
> repeater at a broadcast site, before I got down the hill the repeater
> locked up in transmit. I traced the problem back to the basic cor kit
> circuit without any extra rf bypass cosiderations... not enjoying the
> nearby FM Broadcast Transmitter. Logic & isolation diodes make good
> rf rectifiers...
>
> A hand full of 220pf disc caps in all the right places and we were
> once again working well. The advantage of a commercial radio would be
> the added extra rf bypass and shielding. Sometimes there is no free
> Commercial radio lunch... a standard converted Micor Mobile will
> start in chassis desense at power levels above 30-40 watts. I'm sure
> the converted high powered mitreks also suffer from the same problem.
>
If you are getting in-cabinet desense from a Micor mobile at any power
level, there is something VERY wrong. I've seen them function just fine
at full output, 100W+. (Not left at that power of course, but desense
isn't an issue.)
>
> Kits and conversions are a great way to learn about the equipment,
> else you buy plug-&-play and start playing with the controller right
> away.
>
> There's no reason you can't run a Hamtronics repeater at a commercial
> site when all the homework is done properly. Their turnkey boxes are
> even FCC Type-Accepted.
>
> cheers, skipp
>
>
Not for part 90. If I ever see one of those at a site, I will find out
whose it is and raise hell. Especially if me or my customer is having
interference problems.
--
Jim Barbour
WD8CHL
>> Q <[EMAIL PROTECTED]> wrote: While I agree to a certain extent,having
>> one on the 220 band for 22 years, they didnt play well in the 2
>> meter band with all the rf flying around and were replaced with
>> MastrII's which have been flawless for a quarter century and with
>> superior performance and better audio,squelch,tone decoding,and on
>> and on... I wouldnt even consider any Hamtronics stuff for a
>> commercial site-ever! You can learn a lot by doing your own
>> conversion, probably more than by building their kit. And the docs
>> are superior too! 73,Lee,N3APP
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