Hi Ed,
Understood, was just coincidental that you message popped up as was
looking at potentially adding a pre-amp to my repeater which is not at a
great height nor ever likely to be - long story.
Have tried a few from very good kit form to general purpose broad banded
variable types with little improvement and as you say managed to
overload the front end.
There was a fellow ham over here who was making pre-amps to order but he
seems to have suffered the fate of many small businesses in the
financial downturn.
Although not expensive in themselves, if I bring something in from the
US, postage, insurance and value added tax soon bumps the cost up. I'll
probably just stick with what I have without adding extra problems.
Thank you for your input and advice, always appreciated.
Best regards,
Doug - GM7SVK - Glasgow - Scotland
On 30/07/2010 2:26 AM, Com/Rad Inc wrote:
Hello Doug
Pre amplifiers are nifty gadgets. In my email I am seeking some
personal references about this particular radio and a pre-amp which
may have been tried wioth some level of success.
When you start inserting GAIN ahead of a front end you have to be
careful of overloading the system and introducing
harful side effects.
In very densly congested sites ( lots o f transmitters ) you may
havdet ocomprimise the sensitivity of the reciever for selectivity.
Crystal filter may help - I have found using a receiver with a tight
front end and / or sufficient preselection will triumph over trying to
make
a lesser piece of equipment work. Example a GE Mastr III is a super
reciever -
In my case I am trying to set up a clients 2 recievers with a little
additional sensitivity - we are using this equipment in a remote site
away form other forms of interference ( boondock tower site ).
Some manufacturers are ARR and EMR - EMR makes a bi-polar amp with
variable gain.
ARR also has a fixed gain version -
ARR was very popular with GaS fet low noise stuff for 800 Mhz - used a
lot of them - exccellent results. Costs $100 thru $350
Best r egards
Ed Folta
Com/Rad INc
----- Original Message -----
*From:* Doug Hutchison <mailto:specialq....@ntlworld.com>
*To:* repeater-builder@yahoogroups.com
<mailto:repeater-builder@yahoogroups.com>
*Sent:* Thursday, July 29, 2010 12:30 PM
*Subject:* Re: [Repeater-Builder] Fw: TKR750 -Preamp
Where does one obtain these and at what cost?
Doug
On 29/07/2010 15:58:54, Ken Arck (ah...@ah6le.net
<mailto:ah...@ah6le.net>) wrote:
> At 04:30 AM 7/29/2010, Com/Rad Inc wrote:
> >
> >ubject: TKR750 -Preamp
> >
> >Greetings Group
> >
> >Have any of you experimented with a RX pre-amp for the TKR 750
repeater?
> >
> >I am seeking results of actual trials of a product -
> >
> >Anyone care to comment on their experience(s) ?
> >
>
> <----We use AngleLinear PHEMT preamps all the time on TKR-
> 750's that
> we sell. They work very well without overloading the front end as
> many of the higher gain ones on the market do (generally, 12 to
15 dB
> is all that is needed in a receiver system, not the 20 to 24 dB some
> preamps deliver.
>
> Ken
>
> >
>
>
----------------------------------------------------------
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> Makers of repeater controllers and accessories.
> http://www.arcomcontrollers.com/
> Authorized Dealers for Kenwood and Telewave and
> we offer complete repeater packages!
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> http://www.irlp.net
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> just make 'em. We use 'em!"
>
>
>
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