Sorry about the mis-information in this scenario, I don't know how to
classify exactly what happened on 2 different club co-located repeater
sites but I used helicals carved from junkers and a bi-polar at one
site, gasfet at the other 20kc spacing problem solved on both sites,
coverage range
Now, while an additional preselector won't do much of anything for
adjacent channel troubles, they can work almost miracles for RF overload
from high powered paging and other such interference.
Each tool in the war on interference has it's place.
(Even a 2 Wheeled Dolly for GE Progress stuff).
Steve Bosshard wrote:
Unless the problem ISN'T two signals occupying the same spectrum, and
it's just a matter of one receiver hearing outside its 'channel'.
Joe M.
146R325 occupies from 146315 to 146.335
146.310 occupies from 146.300 to 146.320
They SHARE 146.315 to 146.320.
Oh
Oh Really? If you ASSUME (and you know how I mean that word) that each TX
HAS to have 20 kHz of bandwidth, I guess so, but that's not necessary. Only
if you have 5 kHz deviation and a 5 kHz of frequency response (or some
equivalent combination) will that be true. Most radios, including ham
This is the reason I suggest just adding a helical to the front end of
the regency, they really don't have evidence of a grat overlap or
overload unless a user has a really wide signal which sounds like it may
be the case. In the beginning I was under the assumption it was the
output making spurs
At 10:36 PM 4/27/2004 -0400, you wrote:
This is the reason I suggest just adding a helical to the front end of
the regency,
There is nothing magical about helical resonators - John Phillip Sousa
Ken
--
President and
problems, just the two users.
Mathew
- Original Message -
From: Virden Clark Beckman [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, April 27, 2004 9:36 PM
Subject: Re: [Repeater-Builder] Help on Interference
This is the reason I suggest just adding a helical
Steve S. Bosshard (NU5D) wrote:
Reply:
Please refer to modulation index and Bessel functions. The frequency
response is 300 to 3000 hz emphasized at 3db per octave. Transmitter
instantaneous deviation is supposed to be limited to +/- 5 kc deviation
from center. Significant sidebands in
:[EMAIL PROTECTED]
Sent: Tuesday, April 27, 2004 3:46 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Help on Interference
Well I narrowed down parts of the problem, the first being the wide as a 2x4
Regency receiver, which is going to be changed out, and the other
of the county that will be troublesome.
Mathew
- Original Message -
From: Virden Clark Beckman [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, April 27, 2004 3:02 PM
Subject: Re: [Repeater-Builder] Help on Interference
Rather than re-invent the wheel why
At 4/27/2004 07:36 PM, Virden Clark Beckman [EMAIL PROTECTED] wrote:
This is the reason I suggest just adding a helical to the front end of
the regency, they really don't have evidence of a grat overlap or
overload unless a user has a really wide signal which sounds like it may
be the case.
Looks
, 2004 7:34 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Help on Interference
Oh Really? If you ASSUME (and you know how I mean that word) that each TX
HAS to have 20 kHz of bandwidth, I guess so, but that's not necessary. Only
if you have 5 kHz deviation and a 5 kHz
In fact, you'll actually be exceeding limits because that +/-5 Khz is
TOTAL deviation-including CTCSS/DCS/whatever! And since the spec for
CTCSS/DCS is +/-500 to 800 hz, and the spec for LTR signalling is
+/-1Khz, voice deviation cannot exceed +/-4.5 Khz (4Khz for LTR). And
the equipment is
At 4/26/2004 05:59 PM, you wrote:
I have a repeater with an antenna up about 60 feet in the air,
Frequency of 146.925/146.325 minus offset. Receiever sensitity
is .25 micorovolt at 12DB, seems to be purring along just fine. IFR
show the receive to be on frequency. Here's the problem, there is a
: [Repeater-Builder] Help on Interference
Each signal is about 10 to 12 Khz wide. You are in each other's pass
band.
Public safety had similar problems here - 15 Khz channel spacing and 20 kc
wide channels using geographic separation. Suggestions - use different
sub
audible tones to reduce
w9mwq wrote:
I have a repeater with an antenna up about 60 feet in the air,
Frequency of 146.925/146.325 minus offset. Receiever sensitity
is .25 micorovolt at 12DB, seems to be purring along just fine. IFR
show the receive to be on frequency. Here's the problem, there is a
repeater
-Builder@yahoogroups.com
Sent: Tuesday, April 27, 2004 12:05 PM
Subject: Re: [Repeater-Builder] Help on Interference
w9mwq wrote:
I have a repeater with an antenna up about 60 feet in the air,
Frequency of 146.925/146.325 minus offset. Receiever sensitity
is .25 micorovolt at 12DB, seems
Try using the math on the IF of your rx to see what is making them mix
on your freq, how long have the 2 machines been co-existing on-the-air?
If it were one or 2 users you would know it rather than the entire time
the machine is active, can you see how clean the signal is from that
machine, I
Clark Beckman [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, April 27, 2004 2:26 PM
Subject: Re: [Repeater-Builder] Help on Interference
Try using the math on the IF of your rx to see what is making them mix
on your freq, how long have the 2 machines been co-existing
Mathew Quaife wrote:
Well I narrowed down parts of the problem, the first being the wide as a 2x4
Regency receiver, which is going to be changed out,
yeah. guess ya gotta start somewhere...;c)
and the other is a local
ham using 100 watts to talk to this machine, when in it really only needs
, and Part 97 !!
Ron
WW8RR
-Original Message-
From: Mathew Quaife [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 27, 2004 3:46 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Help on Interference
Well I narrowed down parts of the problem, the first being the wide as a 2x4
.
- Original Message -
From: Rogers, Ron [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, April 27, 2004 2:53 PM
Subject: RE: [Repeater-Builder] Help on Interference
Remind the fellow using 100 watts to talk to a repeater that he could be
in
violation of Part 97 rules on using
-
From: Virden Clark Beckman [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, April 27, 2004 2:26 PM
Subject: Re: [Repeater-Builder] Help on Interference
Try using the math on the IF of your rx to see what is making them mix
on your freq, how long have the 2 machines been
Virden Clark Beckman wrote:
Rather than re-invent the wheel why not try carving the helical from a
dead old high band rx tray and add to the front of yours to make it a
bit narrower than it is barefoot, if you can find a mastr2 with 5
helicals you could ad a pre-amp and convert the near hits
No amount of filtering will resolve 2 signals occupying the same
overlapping spectrum.
Steve
Yahoo! Groups Links
* To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
* To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
*
: Tuesday, April 27, 2004 3:40 PM
Subject: Re: [Repeater-Builder] Help on Interference
Virden Clark Beckman wrote:
Rather than re-invent the wheel why not try carving the helical from a
dead old high band rx tray and add to the front of yours to make it a
bit narrower than it is barefoot
Mathew Quaife wrote:
I do have a micor coming, just don't know much about it until it get's here.
At least I hope that it gets here, kinda shaky on the ebay deal, have not
heard from the seller as of yet.
Mathew
Good luck with it! repeater-builder.com has lots of good info for those.
--
- Original Message -
From: Virden Clark Beckman [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, April 27, 2004 2:26 PM
Subject: Re: [Repeater-Builder] Help on Interference
Try using the math on the IF of your rx to see what is making them mix
on your freq, how long
Unless the problem ISN'T two signals occupying the same spectrum, and
it's just a matter of one receiver hearing outside its 'channel'.
Joe M.
Steve Bosshard wrote:
No amount of filtering will resolve 2 signals occupying the same
overlapping spectrum.
Yahoo! Groups Links
* To visit
PM
Subject: RE: [Repeater-Builder] Help on Interference
No amount of filtering will resolve 2 signals occupying the same
overlapping spectrum.
Steve
Yahoo! Groups Links
Yahoo! Groups Links
* To visit your group on the web, go to:
http://groups.yahoo.com/group
: RE: [Repeater-Builder] Help on Interference
If you really love your regency, change the if filter. Tighten up the
front
end with some extra cavities and a notch. Getting rid of interference is
easy, a mix is another ball game. The older commercial radios had some
very
neat front ends. Stay
-Builder] Help on Interference
Mathew Quaife wrote:
I do have a micor coming, just don't know much about it until it get's
here.
At least I hope that it gets here, kinda shaky on the ebay deal, have
not
heard from the seller as of yet.
Mathew
Good luck with it! repeater-builder.com
Unless the problem ISN'T two signals occupying the same spectrum, and
it's just a matter of one receiver hearing outside its 'channel'.
Joe M.
146R325 occupies from 146315 to 146.335
146.310 occupies from 146.300 to 146.320
They SHARE 146.315 to 146.320.
The front end will make NO
At 4/27/2004 02:00 PM, you wrote:
I do have two more cavities that I could use, but really don't see the need,
at least I hope not.
Mathew
Cavity filters will NOT help lessen adjacent-channel interference problems.
You said that you can hear this person just as good on 146.325 as you can
on
of the
repeater, then I will have to make necessary calls then. Hopefully not.
Thanks.
Mathew
- Original Message -
From: Bob Dengler [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, April 27, 2004 5:11 PM
Subject: Re: [Repeater-Builder] Help on Interference
At 4/27/2004 02
35 matches
Mail list logo
