To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Antenna SWR = Desense?
Tim,
A high-gain antenna that is only 100 feet away horizontally is far too
close. It is bathing your repeater equipment with RF, and very few
machines can tolerate being in such a high RF field.
Vertical
On Sep 2, 2009, at 10:37 PM, tahrens301 wrote:
Nate - I only tried the 'ham quality' antenna because I knew
it would be a better match than the DB224. It was easy
to change, standing on a 6' ladder! Just wanted to see if
a poor swr would induce the desense.
There are no other
-snip-
A side question, dealing with separation.
Obviously, when you are using a split site, vertical separation
makes you a lot more $ than horizontal does.
But, in this type of situation, where you are a single antenna with
a duplexer, what real difference does vertical or horizontal
At 9/2/2009 15:17, you wrote:
The antenna is on the top of a small wooden storage building.
A mast is placed up against the peak of the roof, and the 224
is on top of that.
What's in the building? Any (loose, rusty) metal objects inside?
Might also try a different antenna.
Bob NO6B
: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of tahrens301
Sent: Wednesday, September 02, 2009 9:38 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
Hi Eric,
Hmmm, don't think I said above the station
Hi Jim All,
Thanks for the info responses.
I took down the 224 found that the N connector on the
end wasn't quite up to snuff. I am going to put a
ham antenna on it - think it's a ringo2 or some such thing,
just to see how an antenna with good swr will work in the
desense arena.
Then I'll
Hi All,
And the winner is. Door # 2.
Put the 2 meter vertical up on the stick at the end of
the hard line, the desense was worse!
Perfect match at the feed line end.
Took dummy load put on far end of hard line no desense.
Guess it is the proximity to the antenna. Although about 100',
to resolve.
Stan
--- On Wed, 9/2/09, tahrens301 tahr...@swtexas.net wrote:
From: tahrens301 tahr...@swtexas.net
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
To: Repeater-Builder@yahoogroups.com
Date: Wednesday, September 2, 2009, 11:56 AM
Hi All,
And the winner is. Door
, come to think about it, the end
result of the situation is simular to bad LMR-400.
Scott, N6NXI
- Original Message -
From: tahrens301
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, September 02, 2009 9:56 AM
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
Hi
You mentioned 100 ft hoz separation, I don't think that is enough, but don't
have a chart handy where I am now. Sid.
--- In Repeater-Builder@yahoogroups.com, tahrens301 tahr...@... wrote:
Hi Jim All,
Thanks for the info responses.
I took down the 224 found that the N connector on
Thanks to all...
I guess it could be corrosion at the antenna, but the one that
is on it now is pretty simple, not much opportunity for
corrosion. I am going to put up the 2nd DB-224 tomorrow
see what difference it makes... I don't really think it'll
change much, but it will let me play with
, there
might well be enough to desense your receiver.
Scott
- Original Message -
From: Scott Overstreet
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, September 02, 2009 1:24 PM
Subject: Re: [Repeater-Builder] Re: Antenna SWR = Desense?
Tim
Been there and done
be enough to desense your receiver.
Scott
- Original Message -
From: Scott Overstreet
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, September 02, 2009 1:24 PM
Subject: Re: [Repeater-Builder] Re: Antenna SWR = Desense?
Tim
Been there and done
I've been following this thread on and off. I was wondering if you tried
replacing the 100' plus run of RG-214 with another cable. Or if you have
pulled the connectors on each end to see if they are properly installed. (I
have had connectors installed by the cable supplier that were bad. in
the repeater out of the RF field?
To: Repeater-Builder@yahoogroups.com
From: tahr...@...
Date: Wed, 2 Sep 2009 21:32:35 +
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
Hi Scott,
The 100' of separation is from the repeater to where the
antenna is located.
I have
Why don't you raise the antenna, and get the repeater out of the RF field?
To: Repeater-Builder@yahoogroups.com
From: tahr...@swtexas.net
Date: Wed, 2 Sep 2009 21:32:35 +
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
Hi Scott,
The 100' of separation is from the repeater
Hi Doug,
I put the connectors on the hardline myself, was very
careful in doing so. Also did an RF check with a dummy
load on the end, and no loss/problems.
I am going to concentrate on the actual connectors from
the Quantar.
thanks,
Tim
--- In Repeater-Builder@yahoogroups.com, n3dab
I still think it may be something in the vicinity of the antenna. What kind of
building is the antenna mounted on/above?
You've stated that the repeater is in a metal pole building that's 100ft. away
from the antenna. It's been mentioned before in this thread, but that could be
a noise
The antenna is on the top of a small wooden storage building.
A mast is placed up against the peak of the roof, and the 224
is on top of that.
The metal building that the repeater is in is my garage. Very
plain, no air condx, AC power runs around the pearlings about
4' off the ground.
Gonna
I know the frustration your dealing with. When you did your RF tests, were you
keying the XMTR. thru the local mic. or with the rcvr. disabled, or were you in
the full rpt. mode and using another radio (HT) or low power signal source? My
problems only showed up in the full rpt. mode, after i
in Caig.
--John WB0EQ
--- On Wed, 9/2/09, Scott Overstreet sc...@becklawfirm.com wrote:
From: Scott Overstreet sc...@becklawfirm.com
Subject: Re: [Repeater-Builder] Re: Antenna SWR = Desense?
To: Repeater-Builder@yahoogroups.com
Date: Wednesday, September 2, 2009, 2:24 PM
...@yahoogroups.com] On Behalf Of tahrens301
Sent: Wednesday, September 02, 2009 9:57 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
Hi All,
And the winner is. Door # 2.
Put the 2 meter vertical up on the stick at the end of
the hard line, the desense
On Sep 2, 2009, at 3:16 PM, tahrens301 wrote:
Don - I can put the iso-tee in line, feed the atten port
into the spectrum analyzer. It should show me if the xmtr
is having problems. However, the current antenna is a
perfect match - no reflected power at all, so I think the
xmtr 'should' be
Hi Eric,
Hmmm, don't think I said above the station, but if I implied
it, no, it's horizontal. I can look out the window see it!
Nate - I only tried the 'ham quality' antenna because I knew
it would be a better match than the DB224. It was easy
to change, standing on a 6' ladder! Just
Hi Joe,
The repeater/duplexer is in my workshop (a large metal building).
The heliax goes out the window to a smaller portable building
about 100' away (horizontally spaced). The antenna is on
that building about 10' off the ground.
Don - took the dummyload analyzer to the end of the hard
@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of tahrens301
Sent: Tuesday, September 01, 2009 4:03 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
Hi Joe,
The repeater/duplexer is in my workshop (a large metal
PM
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
Hi Joe,
The repeater/duplexer is in my workshop (a large metal building).
The heliax goes out the window to a smaller portable building
about 100' away (horizontally spaced). The antenna is on
that building about 10' off the ground
, 2009 4:03 PM
To: [3]repeater-buil...@yahoogroups.com
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
Hi Joe,
The repeater/duplexer is in my workshop (a large metal
building).
The heliax goes out the window to a smaller portable building
about 100' away (horizontally spaced
.
Milt
N3LTQ
- Original Message -
From: tahrens301 tahr...@...
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, September 01, 2009 4:02 PM
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
Hi Joe,
The repeater/duplexer is in my workshop (a large metal building
Numbers 1 or 4 are the more likely.
He has a Quantar which is designed to live in high RF environments at antenna
sites making #2 unlikely. Also, with respect to #3, the Quantar PA has a
built in circulator as standard equipment.
--- On Tue, 9/1/09, tahrens301 tahr...@swtexas.net wrote:
From: tahrens301 tahr...@swtexas.net
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
To: Repeater-Builder@yahoogroups.com
Date: Tuesday, September 1, 2009, 5:29 PM
Hi Jeff,
I'll try a different antenna... perhaps that's
Numbers 1 or 4 are the more likely.
He has a Quantar which is designed to live in high RF
environments at antenna sites making #2 unlikely. Also, with
respect to #3, the Quantar PA has a built in circulator as
standard equipment.
OK. I missed (or maybe wasn't paying attention) that
, 2009 4:02:35 PM
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
Hi Joe,
The repeater/duplexer is in my workshop (a large metal building).
The heliax goes out the window to a smaller portable building
about 100' away (horizontally spaced). The antenna is on
that building about 10' off
Is the antenna cut for the repeater freq?
In any case I've never known a bad match into a duplexer tuned into a good
match to work.
I've often fudged...Look at forward power while injecting a signal that is
noisy (when transmitter is keyed). Gently rock the cavity frequency just a bit.
If
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