When we as dealers order the TKR-750 and 850 repeaters there is a factory
code for them to tune the TX and RX to peak it out. I have never had a
problem getting the factory to do it correct but you have to order it
correctly to get it done. Also on all the dealer price sheets they tell you
the unit should be tuned.
I have not had the same problem with the TKR-840 as it is broad band unit.
Maybe the dealer only had the unit programmed and not tuned . Also there is
a code for tune RX only and a code to do both TX and RX.
John
----- Original Message -----
From: "Eric Lemmon" <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: Sunday, June 04, 2006 5:34 PM
Subject: RE: [Repeater-Builder] Kenwood TKR-750K2
> Let's be clear about the difference between programming and tuning. In
> the
> particular case I mentioned in a previous posting on this thread, the
> TKR-750K1 repeater was factory-programmed to the correct 2m frequencies
> and
> CTCSS tones, but the factory did not adjust ("tune") the receiver front
> end.
> The repeater was picked up from the Kenwood dealer with all of the factory
> sealing tape intact, so I know that the programming was already done
> before
> the dealer got it.
>
> When I put the repeater on the bench for checkout, I found that the 2m
> receive sensitivity was about 1.2 uV for 12dB SINAD. On a hunch, I
> programmed 160.000 MHz into the receiver and found that its sensitivity
> there was about 0.32 uV for 12dB SINAD. Let's see now, 160 MHz is exactly
> in the middle of the K1 range 146-174 MHz! So much for "factory tuning."
>
> I carefully tuned the front-end helicals for best sensitivity at the 2m
> receive frequency, and was able to get it to 0.25 uV, quite a bit better
> than the specification of 0.35 uV. When confronted with the above
> findings,
> the dealer (who I will not identify) claimed that the receiver is
> broadband
> and doesn't need any tuning. I guess he never opened the service manual
> to
> read the following statement on page 2: "The RX RF BPF (L2, L3, L5, L6,
> L7
> on TX-RX unit A2) must be aligned to obtain the maximum sensitivity at a
> programmed frequency."
>
> Yeah, I'd sure like to trust the factory to do a complete setup. The
> order
> papers clearly stated that the repeater was to be factory-tuned to operate
> on the specified 2m frequencies. To quote Ronald Reagan: "Trust, but
> verify."
>
> 73, Eric Lemmon WB6FLY
>
>
> -----Original Message-----
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of Maire-Radios
> Sent: Sunday, June 04, 2006 12:25 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Kenwood TKR-750K2
>
> the Kenwood factory will tune them at a very low cost. I can not have my
> tech do them for the price the factory charges.
>
> Next time get a factory job it is well worth it.
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
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