> Is there a point inside the Mitrek that one can take the
> audio out to the controller (in this case a Link-Comm RLC-2A)?
> A low band Mitrek (33Mhz)
Depends on what type of audio you want. The high side of the
volume control is often a great place to take de-emphasized
audio. However, some receivers squelch/mute the audio in
the trailing power amplifier section so you will have constant
no-signal white noise at your controller input if your circuit
uses the trailing Audio Power Amplifier Mute Method. Just to
throw a wrench into the mix I'll say that in a few radios...
I've also seen the de-emphasis network and CTCSS ("PL" to you
Motorhead types) placed after volume control. These are cute
items/tricks you find out when you take a closer look at the
circuit diagram and/or descriptions.
And...
Although a lot of the pure at hearts say nay...
There's nothing wrong with terminating the speaker audio into
a 22 or 27 ohm 5 watt (min) resistor and take your controller
audio across it. The resultant audio should have the CTCSS
filtered (if you have the Mitrek CTCSS board in place), squelched
and level adjustable from the volume control (pot), which you
should probably hide from magic fingers at the repeater site.
There are a number of places to inject/apply transmit audio.
If you "go in" at the mic-input the audio should be pre-emphasized
for transmit somewhere within that chain (path). I've also
added pre-emphasis to the output of some of the external
repeater controllers if you inject your tx audio at a higher/
later stage than the transmitter mic input.
Hopefully someone with a decent amount of Mitrek to Repeater
Conversion experience will pipe up and help you out. If not
I know a guy off the list who would probably know and he's
Email accessible to provide his 50 cent opinion.
cheers,
skipp
> "Gmail - Kevin, Natalia, Stacey & Rochelle" <spar...@...> wrote:
>
> Hi,
> Is there a point inside the Mitrek that one can take the audio out
to the controller (in this case a Link-Comm RLC-2A)? A low band Mitrek
(33Mhz)
> I have downloaded the information from"Lou's Mitrek Repeater
Conversion" and a couple of others which mention a schematic for
emphasis before going into the controller. Taking the audio out on pin 11.
> I would like to leave this out if possible and feed directly?
>
> Regards and Merry Christmas
>
> Kev.
>
>
> ----- Original Message -----
> From: Kevin Custer
> To: [email protected]
> Sent: Sunday, December 21, 2008 2:40 PM
> Subject: Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to
Range 1 (WAS: Holiday Special...)
>
>
> Eric Lemmon wrote:
> > Only one of the five front-end coils for a Range 1 VHF Mitrek
(HLD4081,
> > 136-146 MHz) is still available from Motorola Parts. That one is
part
> > 2480032A07, the violet coil in L1, for $ 4.15.
> >
> > The only option may be to tack on some extra wire to the
existing coils.
> > Although modifying the tuning screws may work, I suspect the Q
will suffer.
> Eric,
>
> I would think a coil retro like what I make available for the
MICOR will
> also work in the Mitrek. This approach would be way better than
tacking
> some added wire onto the existing coil or modifying the screws in
which
> I know that is a bad idea. Is there something special about the
Mitrek
> front-end that you believe would prohibit such a conversion? It's
been
> a while since I messed with the Mitrek but I don't remember anything
> that would prohibit the correct length coil to be installed...
>
> Kevin
>
