Aaron,
You left out the crucial information: What model Telewave duplexer?
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of atms169
Sent: Wednesday, May 20, 2009 5:29 PM
To: Repeater-Builder@yahoogr
ssage -
From: Repeater-Builder@yahoogroups.com
To: Repeater-Builder@yahoogroups.com
Sent: Wed May 20 19:33:36 2009
Subject: RE: [Repeater-Builder] Re: Desense on High Power Linear Repeater?
Aaron,
You left out the crucial information: What model Telewave duplexer?
73, Eric Lemmon W
On Thu, 21 May 2009, atms169 wrote:
> Yes, 80 dB on the duplexers, 100 watts in, that's 10 dB and the preamp
> 18 dB, so I'm losing 8 dB ??
Assuming you're not experiencing front-end overload because of your
pre-amp.
> The sensitivity I believe is 0.4 uV Dstar system.
>
> I live in Texas w
by
> Sent: Wednesday, May 20, 2009 9:03 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Re: Desense on High Power Linear Repeater?
>
> On Thu, 21 May 2009, atms169 wrote:
> > Yes, 80 dB on the duplexers, 100 watts in, that's 10 dB and the p
Aaron,
Howdy again neighbor! Don't start spreading rumors that its flat in Texas,
it's all downhill to the beach.on second thought it IS flat and the
water is bad
Are these the cavities I tuned for you last fall? If so guys these are
typical specs for 4 cans BPBR. Sorry but I couldn't
Put your fire suit on Aaron, you actually typed LMR. Do a search here and
you will find it is known to be a problem in duplex service.
With greater losses on UHF the ranges your observations are expected.
Don
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-bui
Aaron,
I think we've found the cause of your desense: The TPRD-1454 duplexer,
which has four 5" cans, is rated at 77 dB isolation, and is marginal with 20
watts TX and RX sensitivity of 0.4 uV- which calls for at least 82 dB
isolation. At 100 watts, 95 dB is recommended. While these recommended
On Wed, 20 May 2009, Eric Lemmon wrote:
> I think we've found the cause of your desense: The TPRD-1454
> duplexer, which has four 5" cans, is rated at 77 dB isolation, and is
> marginal with 20 watts TX and RX sensitivity of 0.4 uV- which calls
> for at least 82 dB isolation. At 100 watts, 95
This brings up the question of how one actually does testing of a D-Star
system. So far it seems that trail and error is the only way things
actually get measured. Having read that the D-Star boxes Icom sells are
little more than mobiles in a box I am wondering if it is possible to set
the i
At this point if you need to use the amplifier your best bet is to just
reduce the output until the desense goes away and call it good.
tom
> [Original Message]
> From: atms169
> To:
> Date: 5/20/2009 10:52:37 PM
> Subject: [Repeater-Builder] Re: Desense on High Power Linear Repeater?
>
> Hey
atms169 wrote:
> I don't have any test equipment that would work for the digital dstar
> so it's more of a trial and error thing.
There ought to be an analog mode...if there isn't, Icom made a HUGE fubar!
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