Re: [Repeater-Builder] I need to take 5 volts to 8 volts, and one have a schematic

Wed, 11 May 2005 17:58:39 -0700



Mike Morris WA6ILQ <[EMAIL PROTECTED]> wrote:


At 08:53 AM 5/11/05, you wrote:

>First, becuase I have them, they already tone in them, and you get two
>receivers in one,

One on VHF and one on UHF.... and no front end rejection to speak of.

>and since it is in a low rf enerfy location, why not.

You still have to add COR to them. And the packet connector
on the V7 has no concept of PL tone, and only sees one band
at a time.
\

Now this does bring out a good point that I never thought of, so I will have to look at that, and if that is the case, then I will just have to build a couple of COR's for the unit.  THanks for the tip, have to play with that and see what happens there.

Mathew

>As well the receiver's will all be the same.

Desirable but not necessary. The audio has to match, and
most folks do that by using identical receivers. You can
tap off discriminator audio and run identical audio processing.

>By the time I find 4 receivers that match, get 4 xtals, then
>tone boards, the money would be the same,

You don't want tone on your voter link TX. See the links
below and read up on the problems of voting systems.

A Motrac or Motran mobile is $5 or free (even those with PL),
you unbolt the RX and add a West Crystal is under $15, and
you are done! Scavenge the tubes from the Motrac PA deck
and sell them on eBay for $10. Total cost of your voter RX is
maybe $5 plus two transistors to implement the COR.

>then only for a year later to find I have a channel issue, then
>to buy another xtal, just change the vfo and I'm done.

If someone pops up on your coordinated voter link then THEY have
to resolve the problem, not you. You are coordinating your voter
links, I hope. Best to resolve problems, not dodge them by shifting
frequency.

>I agree, you way sounds better, but these are here, and at
>$200.00 a piece, for two receiver's in one box, works out ok for me.

Let me get this straight... you are running a 2m repeater with a
dual band mobile as a voter link...
...you have the V7 2m RX feeding the UHF TX with the UHF
RX as the control receiver? Through one packet connector?
I don't think so.
What do you plan on using as a local controller?

What audio processing are you using between the 2m RX
and the UHF TX, or are you counting on the internal repeat
mode of the V7?

How do you plan on keeping the V7 TX from burning itself up?
You do realize that in a long-winded QSO the voter link TX
will be running 100% of the time the 2M RX squelch is open....
You will need a continuous duty link TX and the V7 is not,
unless you run it on flea power with a beam antenna.

Recommended reading:

for the
theory part only

a
followup to the above article with technical and design-related
comments.




I wrote this article as a summary of about 3 years of voter related
questions (and the answers) on three or four mailing lists.
Note the part about 36-42mhz receivers - nobody wants them, and
a receive converter in front of them makes an excellent link RX stack.

This is
the early GE voting panel - read this for the theory and interfacing
techniques.

This is
the manual on the later GE panel. Again, read it for general theory.

There are some other voter articles on the web page at
but they
are pretty heavy GE specific reading (some are simulcast related,
and simulcast is another major can of worms best left unopened).

Mike WA6ILQ






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