But what the OP asked about was a multi-coupler, not a tower top amplifier.
WalterH
--- In Repeater-Builder@yahoogroups.com, John Sehring wrote:
>
> Let's never forget that ANY loss between the antenna and the receiver will
> degrade the rx's noise figure.� That means feedline, duplexer, cavi
Eric, and list...
> Kevin,
>
> I agree with your conclusions- provided that the exciter meets your expected
> performance. I would never assume that I could automatically subtract 22 dB
> from the proposed isolation, merely because it was a PLL exciter, without
> knowing for certain that its perf
Gary wrote:
Dan Kagabine, the chief engineer at TX-RX systems use to always say
that "once you have enough isolation to overcome any desense, then any
more is a waste of money as it does nothing for you". "If you only
need 70 db then a 100 db duplexer does nothing more for you than a 70
db du
I agree with Kevin. You need a little headroom built in for conditions that
could change. Equipment ages and changes it's operating characteristics.
Temperature swings cause the same issues. Does one need to go overboard?
Probably not. But if you happen to be right on the edge under perfect
con
I saw somewhere someone had taken old phones, desk and mobile and put cell
phone guts in them with a pic processor to decode the rotary dial and was
selling them. On the outside they looked like the real thing!
Sent by Good Messaging (www.good.com)
-Original Message-
From: John Se
> In reference to below, what would be the real advantage to
> using CP antennas in addition to the V and H you'd have
> already? Any signal that arrives will excite a V and/or H
> antenna according to it's arriving polarization, and I don't
> see where CP would be a help.
If you're going to
I have downloaded the S. Manual from two different sources but the schematic
seems to be incomplete. I am having signal loss near the audio output but that
part of the schematic is not visible.
Reading the posts from 2006, I assume that what I have now is as good as it
gets. Just thought some
--- In Repeater-Builder@yahoogroups.com, John Sehring wrote:
>
> Oh, I forgot...circular polarization would be excellent to use on VHF and UHF
> repeater. We want the extra signal strength & the multipath would be way
> less;
CP has always intrigued my for amateur repeater use, although I've
> While I'll agree that more isolation, then what is needed to
> insure no desense is a waste; if this gentleman is suggesting
> that isolation in reserve is a waste, I strongly disagree.
> Why? Operating conditions can change - snow and especially
> ice on the repeater antenna can detune the
Won't happen with a properly set up system. Think "and" squelch.
Since there are only four repeater pairs on ten shared with everyone,
shame on anyone for using carrier squelch there.
> Because CTCSS falses on the random noise.
> Been there, done that, gave
> away the t-shirt.
Al, k
I'll second what Kevin said and add:
What if you want to upgrade? If you only purchased what you needed
before, it may no longer be adequate for your new system which may have
more power or a higher sensitivity receiver.
Better to buy extra isolation now and not need it than to buy less and
ha
Greetings,
I'm wondering if anyone would have any suggestions on current market
tone panels that will reasonably accommodate interfacing with ACC
controllers. Particularly, I recently acquired an RC-850 (3.8 w/CIB)
which I would like to accept both PL and DPL. Price is not an issue in
either
At 06:45 AM 08/23/09, you wrote:
I agree with Kevin. You need a little headroom built in for
conditions that could change. Equipment ages and changes it's
operating characteristics. Temperature swings cause the same issues.
Does one need to go overboard? Probably not. But if you happen to be
Absolutely you need some reserve. The same if you are designing a point to
point path. You don't select equipment that will "just do the job". You
always need a certain amount of reserve for changes of equipment etc. the
idea is that some think the repeater is going to "work better" with more
isol
The reason FM stations transmit circular polarization is to accommodate
both horizontal and vertical receive antennas. Most fixed receivers are
horizontal and most cars are vertical.
You can not transmit both horizontal and vertical polarization at the same
time. Feeding a horizontal antenna an
Hi everybody!
some valuable help is needed. i have the RF tray and the controller on the top
of it SSCB digital capable only (the unit with the led's) 800 mhz
C85CXB-5103BT. the RF tray is lacking the TX VCO and no cables with RCA ends no
connector for stearing and power originaly to TX VCO, no
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