A year ago I had a low-band VHF interference problem that was caused by a solar
charge controller. Switching from an MPPT style charge controller to a less
efficient PWM charge controller cleared up the problem. Might be worth double
checking by disconnecting the panels since the charge
I have inserted a 6dB pad in the antenna port of the duplexer and found that
the IM products drop 12dB, and also curiously, the frequency of the products
change. Removing the pad reverses this effect.
The above says that it's a 2nd order mix, F1+F2, F1-F2, 2F1 or 2F2.
Since it looks to be
Look around for a switch mode power supply that uses 600kHz as the
switch frequency. SMPS Battery Chargers are popular for causing this.
Also florescent twist lights are really good for making desense on
VHF.
Hi Mike,
thanks for your post - I'll think about this a bit more. There is no isolator
on the TX - will add one (and BP filter) when I next go to site this week.
The radio is synthesised.
Regards,
Brett
--- In Repeater-Builder@yahoogroups.com, wb8vlc mas...@... wrote:
I have inserted a
Hi John,
I thought we may have a dubious TX issue - either spurs or as you say something
unstable or oscillating.
I replaced the TX. It had no impact on the problem. The issue appears to be
external to the TX.
Also I have terminated the duplexer into a 50ohm load and looked at the RX port
Paul,
no fluro lights on site. Actually no lighting at all - the site is solar
powered so little capacity for lighting.
No repeater ocntroller - the RX is directly connected to TX via a very simple
(passive) audio and PTT circuit.
I believe it is an IM product because the RX requires a CTCSS
Eric,
all cables are double shielded. No adaptors are used. There is no isolator on
the TX side. Connectors are silver plated, with gold pins.
Antenna is a single folded dipole mounted about 15m above the equipment
shelter. TX power into the antenna is approximately 15W. There are solar
Thanks - no battery chargers on site as all solar powered. There are solar
charge controllers, though I think I have discounted these.
No fluros either.
All equipment was switched off for a test, so any SMPS should have been off.
Cheers,
Brett
--- In Repeater-Builder@yahoogroups.com, DCFluX
Hello,
I am the builder and keeper of a two metre repeater GB3VT here in the UK and
the repeater has now been operational for the past 30 years.
In 1994 it was necessary to vacate the original site, but a few months later we
located a new site and in 1995 the repeater was again operational.
Try this
Force the repeater transmitter on.
Walk around with a hand held that has a CW mode, such as a TH-F6A tuned to
the repeaters input frequency and get a detailed map of the area and note
the S meter readings.
-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Interference
Hi Leroy,
Sounds like its coming straight into the antenna connector on rx since you
mentioned it keeps the repeater keyed. If I'm not mistaken you also mentioned
it cycles w/repeater tx?
I'm guessing this is a commercial
: [Repeater-Builder] Re: Interference
To: Repeater-Builder@yahoogroups.com
Date: Friday, March 5, 2010, 9:23 AM
Dan, have you had any experience using the GE Mastr 11 as a repeater, and if so
what are your thoughts on it.
-Original Message-
From: Repeater-Builder@ yahoogroups. com
--- In Repeater-Builder@yahoogroups.com, Leroy A. M. Baptiste
leroybapti...@... wrote:
When you key up the repeater, and you release, the
repeater is held open (Sometimes)
What do you mean by held open? Is the interference opening/keeping open the
squelch of the repeater receiver, or are
Please provide make and model of repeater, controller, duplexer and
input frequency.
@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On
Behalf Of DCFluX
Sent: Friday, March 05, 2010 2:08 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Interference
Please provide make and model of repeater,
controller, duplexer and
input frequency.
Of DCFluX
Sent: Friday, March 05, 2010 2:08 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Interference
Please provide make and model of repeater,
controller, duplexer and
input frequency.
Yahoo! Groups Links
146.760 Mhz.
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On
Behalf Of DCFluX
Sent: Friday, March 05, 2010 5:54 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Interference
PRO5100 = 44.85 MHz 1st
:54 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Interference
PRO5100 = 44.85 MHz 1st IF with High Side
Injection, 455kHz 2nd IF,
16.8 MHz TCXO
What is the frequency of the repeaters
transmitter?
On Thu, Mar 4, 2010 at 12:48 PM, Leroy A. M.
Baptiste
Leroy, perhaps you answered my questions from earlier today and I missed your
answers. If you answered I apologize. So here they are again.
--- In Repeater-Builder@yahoogroups.com, Leroy A. M. Baptiste
leroybaptiste@ wrote:
When you key up the repeater, and you release, the
...@yahoogroups.com] On
Behalf Of larynl2
Sent: Friday, March 05, 2010 9:19 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Interference
Leroy, perhaps you answered my questions from
earlier today and I missed your answers. If you
answered I apologize. So here they are again
...@spiceisle.com
Subject: RE: [Repeater-Builder] Re: Interference
To: Repeater-Builder@yahoogroups.com
Date: Thursday, March 4, 2010, 8:44 PM
Hi Laryn, no I did not get a chance to answer your
questions, but here goes. The interference is
holding the squelch open on the repeater receiver
--- In Repeater-Builder@yahoogroups.com, Leroy A. M. Baptiste
leroybapti...@... wrote:
Hi Laryn, no I did not get a chance to answer your
questions, but here goes. The interference is
holding the squelch open on the repeater receiver
sometimes, which by extension holds the
transmitter on,
Hi Skipp, Yes I reread the post and realize I jumped to some horrible
conclusion. My bad. Guess I'll sink back into my cave and think
twice before commenting.
Randy
--- In Repeater-Builder@yahoogroups.com, skipp025 skipp...@...
wrote:
Hi Randy,
I did place a notch cavity in the
I remember that Neutec Unit... saw it on Ebay.
Mike
Do you have any analog television stations on channel(s) 11
through 14 in the area still on the air?
If so, I might suspect an IF image might be possible. I had
the same type of problem here from channel 13 getting into a
number of Icom
Hi Possib. a high power C.B. operater.
- Original Message -
From: skipp025
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, February 26, 2009 9:51 AM
Subject: [Repeater-Builder] Re: Interference or Intermod ( ? ) Helphere
goes
I remember that Neutec Unit... saw
Skipp, why would you not filter it on the input?
Randy
--- In Repeater-Builder@yahoogroups.com, skipp025 skipp...@...
wrote:
I remember that Neutec Unit... saw it on Ebay.
Mike
Do you have any analog television stations on channel(s) 11
through 14 in the area still on the air?
] On Behalf Of james f potter
Sent: Thursday, February 26, 2009 11:41 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Interference or Intermod ( ? )
Helphere goes
Hi Possib. a high power C.B. operater.
- Original Message -
From: skipp025 mailto:skipp
getting any power on channel.
I always knew when he switched into hi power.
-- Original Message --
Received: Thu, 26 Feb 2009 02:32:21 PM PST
From: Michael Ryan mryan...@tampabay.rr.com
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Interference or Intermod
:58 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Interference or Intermod ( ? )
Helphere goes
Don't analog TV receivers us an IF of 45 MHz?
About 15 years ago I lived in an apartment where I had a 29.6 Mhz Mocom 70
remote base and a LPB series 330watt Motrac
Hi Randy,
I did place a notch cavity in the antenna feed line, tuned
to the image frequency of the receiver IF.
As an example
Notch 245.750MHz (TV Channel 14 Audio Carrier Frequency)
245.750MHz minus 21.4 IF = 224.05
Receiver IF Frequencies vary a bit... and both Channel
13 and 14
...@yahoogroups.com] On Behalf Of JOHN MACKEY
Sent: Thursday, February 26, 2009 5:58 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Interference or Intermod ( ? )
Helphere goes
Don't analog TV receivers us an IF of 45 MHz?
About 15 years ago I lived
AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Interference or Intermod ( ? ) Helphere
goes
Try a meet and greet first...
You could offer to help the CB radio guy clean up his station
and coax him toward getting a ham ticket. He might not even
know he's hosing
That's not right, TV channel 14 is 470-476 Mhz.
-- Original Message --
Received: Thu, 26 Feb 2009 08:59:28 PM PST
From: skipp025 skipp...@yahoo.com
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Interference or Intermod ( ? ) Helphere
goes
Hi Randy,
I
-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Interference or Intermod ( ? )
Helphere
goes
Hi Randy,
I did place a notch cavity in the antenna feed line, tuned
to the image frequency of the receiver IF.
As an example
Notch 245.750MHz (TV Channel 14 Audio Carrier
be
problematic.
cheers,
s.
Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of skipp025
Sent: Tuesday, 12 February 2008 4:56 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Interference on a 6 meter repeater
Subject: [Repeater-Builder] Re: Interference on a 6 meter repeater
Mark Harrison [EMAIL PROTECTED] wrote:
Hi Skipp and Joe,
BTW, You could also use a lower gain antenna instead of a power
attenuator. High gain antennas are not always a good idea :-)
73,
Mark vk3byy
In 97.5% plus
: Mark Harrison
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, February 13, 2008 4:15 PM
Subject: RE: [Repeater-Builder] Re: Interference on a 6 meter repeater
Hi Skipp,
I was only suggesting a lower gain antenna as an alternative to using
a power attenuator.
It will work
Re: Interference on a 6 meter repeater
That's odd that the cavity in the telemetry radio feed didn't
change things, but it goes away when the radio is disconnected
from the antenna.
I'm surprised how many people feel cavities (the typical cavity
filter) are sure-fire cure-all medicine.
Re: Interference on a 6 meter repeater
You are living one of my past nightmares... Let me give you
the probable fix first.
If you have them, try a number of attenuator pads in series with
the Yaesu Radio. First might be a 10 dB pad and back the values
down while testing for grunge.
I
: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of skipp025
Sent: Tuesday, 12 February 2008 4:56 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Interference on a 6 meter repeater
Re: Interference on a 6 meter repeater
You are living one of my past
--- In Repeater-Builder@yahoogroups.com, Eric Lemmon [EMAIL PROTECTED]
wrote:
Nate,
Was the interference present before the duplexer was retuned? If
not, then
I suspect that the tuning is not correct.
I definitely agree with that possibility.
Another to ponder-- after tuning the
Can you see if you can find your drawings on the loops? need to make up a
couple.
Thanks!!
Tom
W9SRV
skipp025 [EMAIL PROTECTED] wrote:
Hi Tom,
The bp loops are pretty much just an SO-239 and the matching metal
loop if you wanted to build some. I probably have diagram'd out
Hi Tom,
The bp loops are pretty much just an SO-239 and the matching metal
loop if you wanted to build some. I probably have diagram'd out the
demensions of both the loops and bpbr probes if you end up having to
roll your own.
Contact the Railroad to see if you can find a warm body to work
In a message dated 5/24/2007 1:33:13 A.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
Just as a tongue in cheek comment... you could operate your own
box and play train-set with the real deal.
cheers,
skipp
Skipp .
You do not know how much fun Tom's dad would have with
Think we can get Bob to put locomotive control macros on the new 7330?
Yea- Dad would love that..Another christmas gift for the grandkids that
he gets to play with!
Tom
[EMAIL PROTECTED] wrote:
In a message dated 5/24/2007 1:33:13 A.M. Central Daylight Time, [EMAIL
Here is one that drove me nuts for almost a week when I was still at
the city...
- Mountain-top radio site (1800' elev).
- 260-foot freestanding tower
- 8-bay uhf antenna on top platform
- Connected to a MSF2000 transmitter on the city's 453.xxx paging
freq and a Zetron digital paging
At 06:32 PM 1/12/2006 -, you wrote:
Apparently the 152 transmitter's signal was mixing with the 162 MHz
weather transmitter's signal, INSIDE OF MY TANK CIRCUIT of my UHF
paging transmitter !!!
---Yet more evidence why anyone who deploys a repeater without a
circulator should be summarily
I blow up circulators, try a shorted coaxial stub instead.On 1/12/06, Ken Arck [EMAIL PROTECTED] wrote:
At 06:32 PM 1/12/2006 -, you wrote:Apparently the 152 transmitter's signal was mixing with the 162 MHz
weather transmitter's signal, INSIDE OF MY TANK CIRCUIT of my UHFpaging transmitter
At some of the high level Metro Radio Sites with
mulitple Broadcast Stations going full tilt, you
can easily have a hundred watts or more of rf
comming back down the feed line.
You need the right size/type circulator. A shorted
coax stub is nice to have in addition to the circulator,
but you
I've had to send of and repair a 150W rated EMR circulator 5 times so
far, and it keeps blowing up. The last time it went it took the
transmitters power FET with it. VSWR on the antenna is near perfect
with 146 forward for 4 watts reflected. Transmitter runs fine on just
the antenna, but I can
At 01:59 PM 1/12/2006 -0700, you wrote:
I blow up circulators, try a shorted coaxial stub instead.
---Then you need a bigger load (don't we all!).
My Quintron UHF repeater has a dual stage circulator - the first load is
250 watts, the second is 10 watts and both are external.
My MastrII's
They blow up on the input port, output to load is always fine.On 1/12/06, Ken Arck [EMAIL PROTECTED] wrote:
At 01:59 PM 1/12/2006 -0700, you wrote:I blow up circulators, try a shorted coaxial stub instead.
---Then you need a bigger load (don't we all!).My Quintron UHF repeater has a dual stage
--- In Repeater-Builder@yahoogroups.com, Eric Lemmon [EMAIL PROTECTED]
wrote:
Adam,
Any emission by a commercial/industrial system that causes
significant
interference to a licensed user in an adjacent band is a violation
of
FCC rules, period. You don't need to spend any more time trying
for Verizon? Would
they get you involved in soemthing like this?
Thanks again..
Adam N2ACF
- Original Message -
From: Ken [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, November 29, 2003 5:43 PM
Subject: [Repeater-Builder] Re: Interference Found!
Hi Adam
this?
Thanks again..
Adam N2ACF
- Original Message -
From: Ken [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, November 29, 2003 5:43 PM
Subject: [Repeater-Builder] Re: Interference Found!
Hi Adam,
The person you should try to get in contact
-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Interference Found!
Light Span sounds like a transmission product made by AFC in Petluma
CA. 147.456 is 72 times 2.048 MHZ or 96 times 1.536 MHz which are
typical backplane clocks in that type of equipment. That box is
supposed to be FCC part
Hi Adam,
The person you should try to get in contact with at Verizon would
be the Outside Plant Engineer for your area. Can you email me some
information such as the location of this Light Span box? I can try
looking him/her up on the company website Monday.
Ken
--- In
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