Cresend yes very good we use a lot of it.
----- Original Message -----
From: Jed Barton
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, March 25, 2010 1:03 PM
Subject: RE: [Repeater-Builder] Re: opinions for a public safety repeater
Hey there,
so it sounds like the tkr750 might be the way to go.
I've heard the cresend stuff is awesome.
-----Original Message-----
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of skipp025
Sent: Thursday, March 25, 2010 8:38 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: opinions for a public safety repeater
> "Jed Barton" <j...@...> wrote:
> Hey guys,
> Need some input here. I'm putting together a public safety repeater
> for my local FD. It's going to be really simple.
> Given the reliability factor, we're going with a Kenwood.
> Here's the million dollar question, i need some input. How about a
> kenwood tkr750 or a tkr740. I've run several 750s with great results.
> I have not played with the 740, but i know it has an amazing receiver,
> but yet only pushes a few watts.
> Any suggestions for a good amp, perhaps Cresend i think it is.
> Thanks,
> Jed
Hi Jed,
The Kenwood TKR-750 and TKR-740 are both great Repeaters. The TKR-750 also
has an amazing receiver. Proper setup of the receiver should normally
include the front end pre-selector alignment using a special coax cable jig
assembly and a tracking generator properly configured and installed onto the
PC-Board matching input and RF sample port/jack.
Most people and Dealers tend to do the more casual "peak for max signal"
method, which results in very usable but not the absolute best sensitivity
and performance. I'm very much amazed how many repeaters we service with
rather odd looking (on the test
equipment) "tweak and peak" front end alignment(s). So be sure to ask any
Dealer what and how they prepare your equipment before they send it to you.
The TKR-750 is more of a self contained ready to use repeater with a lot of
built in features. Very popular for operations toward the 50 watt power
level.
The TKR-740 is more of "system repeater" meaning... how many owners often
use them with external Power Amplifiers and Controllers. The TKR-740 has
much less power output and normal operation assumed by most people is to
include an external RF Power Amplifier.
If you need to bark higher than a 50 watt signal onto the air the most
popular method is to include (and use) an external RF Amplifier.
You can save quite a bit of serious money by using the same external
amplifier configuration with a TKR-750 Repeater and a higher drive
(input) level External Amplifier. There's nothing in stone about driving an
external high power RF Amplifier at the 25 to 50 watt level compared to
spending a lot more money on a low drive level amplifier. TPL, Cresend and
TE can and will sell you higher drive amplifiers for much less money and you
end up with pretty much the same end product. In the hopefully rare case
where an external amplifier might fail, continued repeater operation at the
25-50 watt power level is quite usable versus the very low power output of
the 740 repeater. There can be different advantages to using the TKR-750 or
the TKR-740 Repeater.
cheers,
skipp
skipp025 at yahoo.com
www.radiowrench.com
