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 (as he
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
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: Dual receivers on one antenna for RX
only site
On Mar 9
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
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
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 1/4 wave length. I've seen
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 we were
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
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 to
Ross Johnson kc7...@... 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
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 n...@... wrote:
What technical reason causes this?
Nate
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. Would a
!
-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 Johnson
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
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