Hey ole man...how is this??? :)
Also it is putting my sig just after my reply instead of at the end.
73, ron, n9ee/r
On Mon, May 12, 2008 at 5:56 PM, John J. Riddell wrote:
Hey Ron, How about setting your Font back to at least 10 for all
the
senior citizens who like to read your stuff :-))
73 John VE3AMZ
----- Original Message -----
From: Ron Wright <mailto:[EMAIL PROTECTED]>
<mailto:[EMAIL PROTECTED]>
To: Repeater-Builder@ yahoogroups. com
<mailto:[email protected]>
<mailto:[email protected]>
Sent: Monday, May 12, 2008 9:34 AM
<mailto:[email protected]>
Subject: RE: [Repeater-Builder] Re: Adding Control Receiver without
Separate Antenna <mailto:[email protected]>
<mailto:[email protected]>
I would recommend not using a 12.5 kHz spacing freq in this case of a
control receiever, a receiver that is only 12.5 kHz away from your
regular repeater input.
With typical good FM analog receivers these would both have
overlapping passbands and an input signal on the repeater input would
interfer with the control input. With som many using IC type DTMF
decoders any interference, just over lapping distorted voice would
hender the decoder decoding.
A typical UHF duplexer would have a notch wide enough for a freq
+/-25 kHz away. Know this is going to be another repeaters input,
but with some research could find is close in distance to you.
I have used control UHF freq that are 6.25 kHz spacing, but these
were in the 446 range and on separate antenna. Just had access to
this. I used this freq to give some added security.
73, ron, n9ee/r
Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.
On Sun, May 11, 2008 at 10:24 PM, Laryn Lohman wrote:
--- In Repeater-Builder@ yahoogroups. com
<mailto:[email protected]> , "John Transue" <[EMAIL PROTECTED]
.>
wrote:
Laryn K8TVZ,
So, if I understand, I should put a splitter after the pre-amp,
and the control frequency should be a split channel. Does this mean
that I use half way between two channels?
Right, one of the 12.5 kc. in-between channels would be less likely
to
have something on them.
Another question, who makes a good splitter, and how can I know I
am getting a good splitter?
Well, I've seen 50 ohm splitters quite often at hamfests. I don't
have a good brand name to point you to. I am, however, using a 75
ohm
TV splitter. Purists will hate this, but especially, if you are
after
a preamp, I don't see this as a big deal. It works just fine here
with no measured loss in repeater receiver sensitivity through the
system. Use quality coax and fittings. I've found that RG142 works
reasonably well with the TV splitters since it has a solid center
conductor.
If you are not using a preamp, then you really need to do things
right, using a proper splitter, and still you may lose some
sensitivity.
Some of you are saying, where's the quality in that splitter scheme?
Well, experimentally I've found it works well here, so after initial
measurements showed me that things were still the same, I'll tend to
stay with what works, but ready to ditch the whole thing if needed
and
go another route. Sometimes <quality> takes the form of performance,
not looks or perfection. If system sensitivity had suffered it
wouldn't be there for more than 15 minutes.
Laryn K8TVZ
