At 3/10/2010 02:42, you wrote:
>On Mar 9, 2010, at 8:37 PM, n...@no6b.com wrote:
>
> > t most certainly does. Try random length cables from the cavities to the
> > T instead of 1/4 wavelength (like one local did several years ago) & watch
> > your sensitivity drop by over 20 dB if you're unlucky (
At 3/10/2010 11:16, you wrote:
>Actually, Gary, you are 180 degrees out. On a pass cavity, off frequency
>signals see a very high impedence path, an open not a short. If your
>version were true you could never use pass cans as a duplexer since both
>sets of cans together would show a "short" t
Actually, Gary, you are 180 degrees out. On a pass cavity, off frequency
signals see a very high impedence path, an open not a short. If your version
were true you could never use pass cans as a duplexer since both sets of cans
together would show a "short" to EVERYTHING.
The T connector is ju
> When I say the notch presents a "short" it is not really a
> short but a very low impedance of say a few ohms. But by
> having the unwanted source impedance high rather than at 50
> ohms it is much easier to pull the high impedance down with
> the "few ohms" short circuit than it would be if
oogroups.com] On Behalf Of Dan Hancock
Sent: Wednesday, March 10, 2010 12:50 PM
To: repeater builders
Subject: [Repeater-Builder] Re: Dual receivers on one antenna for RX only
site
One thing was missed regarding cable lengths. The loops in the cans are part
of the equation for figuring the 1
uilder@yahoogroups.com [mailto:Repeater-
> buil...@yahoogroups.com] On Behalf Of larynl2
> Sent: Wednesday, March 10, 2010 12:54 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Re: Dual receivers on one antenna for RX
> only site-cable length
>
>
> In
In all of the discussion on cable lengths between a T and cavities to split to
receivers, I'm wondering if the loop length inside of each cavity is to be
included in cable lengths. It seems it always is included when calculating
cavity interconnect cables on a duplexer, for example, but has no
One thing was missed regarding cable lengths. The loops in the cans are part of
the equation for figuring the 1/4 wave length. I've seen that discussed here
many times in postings related to inter-cable lengths on duplexers. But the 1/4
wave length issue only applies to the inter-cabling between
to
high vswr.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> buil...@yahoogroups.com] On Behalf Of Nate Duehr
> Sent: Wednesday, March 10, 2010 5:42 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Re:
On Mar 9, 2010, at 8:37 PM, n...@no6b.com wrote:
> t most certainly does. Try random length cables from the cavities to the
> T instead of 1/4 wavelength (like one local did several years ago) & watch
> your sensitivity drop by over 20 dB if you're unlucky (as he was). That
> mistake literally
Ross Johnson wrote:
> Thanks for the reply’s everyone. That cleared it up for sure. I will go
> ahead and build the T to cavity cables to one electrical wave length for
> the other band. And is that ¼ wave plus velocity factor of cable? Which
> will be FSJ1.
Actually, it's 1/4-wave times the velo
!
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of skipp025
Sent: Tuesday, March 09, 2010 4:29 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Dual receivers on one antenna for RX
only site
> "Ross
At 3/9/2010 16:29, you wrote:
> > Here's the idea. This is a remote RX site. The idea is
> > to run something like a beefed up X500 dualbander at tower
> > top, then 7/8 hardline 100 feet down to the receivers.
> > Both receivers will have one or two bandpass cavities
> > inline before the T. Woul
> > On 3/9/2010 4:53 PM, Gary Schafer wrote:
> > Without the proper length cables between the cavities
> > and the antenna T connector both UHF and VHF signals
> > will be attenuated depending on the luck of the cable
> > length.
> Nate Duehr wrote:
> What technical reason causes this?
> Na
> "Ross Johnson" wrote:
> Hello to the group,
> My name is Ross KC7RJK This is my first post.
Hi Ross,
My name is skipp and I'm a junkoholic...
"hi skipp"
and I %#*^& scuse me, lost my mind for a moment.
Moving along
> Most questions are answered from that amazing and up
> to da
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