I'm going to suggest another Poor man's voter
despite the probability that someone, somewhere,
has already done so.
I was thinking you might go ahead build your
2nd rcv site with a one way link to the main tx.
However, you would rely on the link activation
to vote the rx signal into the
I don't know the RLC controller per se'.
If it has a voter panel in it I'd say ok.
If you don't have a voter panel I'd say
the idea is very iffy.
You don't want the same rcv audio being
summed from two different sources unless
you take very special precautions. If
those precautions are not
At first blush it looks possible if you have an isolator somewhere in
the tx lines of each device you're willing/able to suffer some
performance degradation.
A lot depends on the actual frequencies power involved.
How the node is configured for antenna ports would also play in.
--- In
In the repeater case, disable the tx, put an ISO-T in the line with a
dummy load in place of the feed-line.
[A] Set the generator for 12db sinad or 20db of quieting.
Note the generator level.
At this point you could key the tx to see if there's anything odd in
the duplexer..Make sure the dummy
Necessity is the mother of invention.
You are not alone in the universe my friend.
rtc.
--- In Repeater-Builder@yahoogroups.com, n...@... wrote:
...and everyone thought I was nuts for using a Regency scanner as a
deviation monitor signal generator.
Bob NO6B
I wasnt aware that the newer chemistries needed an optimizer.
From some reading, Im led to believe the newer stuff doesnt have
memory issues due the limited charge/discharge cycles available in
some chemistries, you don't really want to cycle them too often.
Every linear Astron I've ever owned had an issue with vhf getting
into the regulator thru the 12vdc output leads.
I've always cured the issue by putting a 0.01 cap across the output
studs another to the chassis from the pos stud. Additionally, you
could put one from the neg stud to the
Reading comprehension must be on holiday here.
In the original post, the licensing thing was brightly illuminated.
As to the mechanics of the situation: you probably don't need
anyones' external controller to accomplish this task.
As I posted, you simply mate the appropriate I/O's program
You probably already know you need to find tx audio input, squelch
gated rx audio output, ptt COS or TOR.
COS is carrier operated relay TOR is tone operated relay.
Preferably you'll use TOR as the active low output to key the vhf ptt.
There's software settings to make these I/O's as you need
I would be carefull in applying an antenna other than a rubber duck.
It seems to me these radios fall under a class of non-licensed but
having rules specifying no external antennas other than the type it
came with.
I suspect those rules preclude an antenna connected by coax.
I'm not entirely
The Vertex is a good commercial repeater but be careful.
There were two versions differ mainly in the PA section.
The older version had a bipolar xsistor PA while the newer has a rf
hybrid module.
Neither of those repeaters is 100% duty cycle unless you cut the
power in half even then I'd be
The older foreign looking radios have several stages of helical
tuning in the front end mixers. Much better selectivity than the
newer sm track tuned front ends.
You could, of course, buy a filter for this but why? since the older
units come with a good one.
Interfacing with the the older
One would think the input to your controller is already bandpass
filtered for the super sonic audio frequencies it needs to perform
squelch gating.
Is there a possibility of a dc component on the tap-off point that is
influencing the input to the controller or...is the tap off point at
such a
I have had a tv cause interference to a system before.
It was in an Illinois cnty jail.
The interference wasn't there until this one tv in a cell was turned on
and tuned to a certain channel.
I thought it was cable company leakage until they came out together
proved otherwise.
The
It's not so much a defect as it is asking the rptr to do more than it
was designed for. It may be a 45 watt PA but in rptr use, medium to HD
rptr use, drop it down to about 25 to 30 watts out of the PA. Enjoy
what you get thru the duplexer. Asking for more will melt the PA.
The earlier units
Every radio today uses a crystal as its reference, hence frequency
stability.
Some Pll's compensate for temperature using the uprocessor, a lookup
table a DAC.
I can't think of any off the shelf units that still heat the xtal unless
its an option.
I found little wrong with xtal heating in the
--- In Repeater-Builder@yahoogroups.com, Jeff DePolo [EMAIL PROTECTED]
wrote:
Do you have any thoughts on why or how a well designed Z
match could produce cable
radiation?
For the feedline to radiate, there would have to be currents flowing
on the
shield. It would seem to me the only
Some of those N type terminations use a screw in connector / adapter.
I've unscrewed the N's from mine in order to thread in a N female to UHF
male adapter on many occassions. Your terminations may be able to do
this?
rtc
--- Original message --
From: skipp025
Aside from any possible receiver deficiencies, you might want to
consider that the Vertex VXR7000 has a pretty weak PA section.
The earliest ones came thru with a discrete transistor PA. They became a
problem like so many other PA's in that the collector current was too
much for the pad melted
I was under the impression that as long as the transmission was one of
direct benefit to the ham community at large, it was not considered
broadcasting in the usual sense. Hence, you have W1AW the other news
caster org.
I don't know that short duration control tones are illegal provided they
It's a Motorola hi duty cycle hi power repeater/base PA for 800mhz.
Lo drive requirement 75watts out constant duty. You could push it to
an intermittant 100 watts if you added a cooling fan. I've rebuilt a few
of these but a long time ago.
FedEx had a bunch of these for their mountaintop
I might have a cheaper answer to it all but it depends on what radios
exist in the fleet. If they are anything like the Kenwoods, they'll
have built in dtmf 2 tone encoders/decoders. I believe some Motorola
mobiles have this as well.
Program the units to encode either dtmf or 2 tone on a
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