On Fri, 21 Aug 2009, John Sehring wrote:
Then of course 12 identical receivers, I'd use, oh, Mitrek's or
MaxTrac's. I think I'd not be inclined to use Micor or any of the
Syntor radios because they are purpose-designed radios for quite wide
freq. spreads. This necessarily makes for the
Feeding 2 separate V H antennas in phase yields 45 degree polarization.
If one antenna is fed 90 degrees lead or lag, then you have RH or LH CP.
--Don-- W8DPK
larynl2 wrote:
...
Years ago before CP antennas were commonly available, FM stations
would feed two separate antennas on the
Well, I have only one observation on this statment. In late 70's or early 80's
CP was the proposed solution to ghosting. WTTV - 4 Bloomington converted to CP
for that exact reason. Working in the field we documented the difference at a
receive site. I still have the Poloraid's somewhere but
--- On Mon, 8/24/09, Jeff DePolo j...@broadsci.com wrote:
From: Jeff DePolo j...@broadsci.com
Subject: RE: Re: [Repeater-Builder] Diversity FM reception
To: Repeater-Builder@yahoogroups.com
Date: Monday, August 24, 2009, 9:32 PM
Yes, CP does cause more multipath esp
Well, just turn your 2m handie talkie even with a rubber
ducky on its side note the drop in signal strength. Cross
polarization losses, e.g. linear V to linear H (or vice
versa) can be up to 30 dB!
In the absence of multipath, or more correctly, obstructions causing
reflections that
--- In Repeater-Builder@yahoogroups.com, Gary Schafer gascha...@... wrote:
You can not transmit both horizontal and vertical polarization at the same
time. Feeding a horizontal antenna and a vertical in phase will give 45
degree polarization. For simultaneous vertical and horizontal the
Lots of consumer TV receivers use vertical, telescopic whips.
- Original Message -
From: larynl2
To: Repeater-Builder@yahoogroups.com
Sent: Monday, August 24, 2009 4:23 PM
Subject: Re: [Repeater-Builder] Diversity FM reception
The local channel 8 analog station here had
of Engineering of one
of the largest national Canadian TV networks (he's a ham).
-
From: larynl2 lar...@hotmail.com
Subject: Fw: Re: [Repeater-Builder] Diversity FM reception
To: Repeater-Builder@yahoogroups.com
Date: Sunday, August 23, 2009, 11:52 AM
--- In Repeater
Yes, CP does cause more multipath esp. in urban environments.
Turns out there are a large number of buildings the
preferentially reflect V better than H. CP gives V energy
othwise lacking (mostly) in a strictly H xmt situation. What
you get with strictly H pol. is quite a glorious
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 use
--- In Repeater-Builder@yahoogroups.com, John Sehring wb...@... 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
Of John Sehring
Sent: Sunday, August 23, 2009 12:51 AM
To: Repeater-Builder@yahoogroups.com
Subject: Fw: Re: [Repeater-Builder] Diversity FM reception
I turn out that use of CP in urban suburban areas results in somewhat more
signal strength on linearly polarized antennas, e.g. vertical whips
: larynl2 lar...@hotmail.com
Subject: Fw: Re: [Repeater-Builder] Diversity FM reception
To: Repeater-Builder@yahoogroups.com
Date: Friday, August 21, 2009, 9:08 PM
In reference to below, what would be the real advantage to
using CP antennas in addition to the V and H
, 8/21/09, larynl2 lar...@hotmail.com wrote:
From: larynl2 lar...@hotmail.com
Subject: Fw: Re: [Repeater-Builder] Diversity FM reception
To: Repeater-Builder@yahoogroups.com
Date: Friday, August 21, 2009, 9:08 PM
In reference to below, what would be the real
Paul,
I use double or even triple diversity on 10m 6m FM.
On 10m, I use a base-fed half-wave vertical installed right above on the same
mast as a 3-ele horizontally polarized 10m beam. That gives me rather more
polarization than space diversity but it works FB.
I have a 3rd identical rx as
: John Sehring
To: Repeater-Builder@yahoogroups.com
Sent: Friday, August 21, 2009 11:11 AM
Subject: [Repeater-Builder] Diversity FM reception
Paul,
I use double or even triple diversity on 10m 6m FM.
On 10m, I use a base-fed half-wave vertical installed right above on the
same
Subject: Re: [Repeater-Builder] Diversity FM reception
To: Repeater-Builder@yahoogroups.com
Date: Friday, August 21, 2009, 1:34 PM
When I lived in Atlanta in the 80's I was a few miles from the
local 10m repeater, and quickly noticed that distant stations which
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.
Most FM broadcasters use CP.
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