Several months ago I put a six meter machine on the air in my area. It is a
GE Master Pro tuned for 52.810 out and 51.110 in. One of the things still
nagging me is some sort of desense or RF phase noise, let me explain. After
tuning up the duplexers into a dummy load and running some tests
--- In Repeater-Builder@yahoogroups.com, skipp025 skipp...@...
wrote:
Hello groovy guys and gals,
I picked up an Alexander Batteries Optimizer (4 pocket model)
last weekend at the local ham flea market. I also see a number
of similar models on ebay cheap enough.
Hi Skipp, any luck
The SM-512 is a service monitor that covers 1 to 512 MHz if memory
serves correctly. It has a built in Sinadder and Millivolt meter. The
system was designed around a Bearcat scanner. When Bearcat quit making
the scanner, the system was redesigned from scratch and expanded to go
to 1GHz, hence the
Hello All, Need help with the Optimizer conditioner. Need a cup or
number for the cup for a BK battery. Thanks Del
First of all, 6 meters can be a very noisy band. But the noise you
describe sounds like it is something different. What kind of antenna
are you using?
Let me take a wild guess. The 7.2kv line is inducing noise on your
antenna feedline. It goes away when you take the feedline off the
Tom
I think you have a corrosion problem in your antenna system.
I had a similar if not identical problem in a 2 meter repeater hereyears of
good performance and then serious desense. I ran the same tests as you have
with same results.
The fix here was an overhaul of the Hustler 144-G7
If it's power line noise you can check by keeping your TX off and have someone
with a noisy signal key up on the repeater input while you listen on the local
receiver. You could use your signal generator into a whip antenna. You'll know
if there's something in there. You won't hear it without
I missed something worth mentioning. You are using a Mastr Pro transmitter?
They were prone to being spurious. Questionable contact with the finger stock
around the final output tube caused it. Are any of the fingers broken?
Chuck
WB2EDV
Several months ago I put a six meter machine
At 12/24/2008 12:45, you wrote:
The SM-512 is a service monitor that covers 1 to 512 MHz if memory
serves correctly. It has a built in Sinadder and Millivolt meter. The
system was designed around a Bearcat scanner. When Bearcat quit making
...and everyone thought I was nuts for using a Regency
I have found a simple way to verify if noise is coming from a power line
arc-over. Any such noise generated by a power line will only occur as
the voltage on the line approaches peak and it will be synchronized to
120 Hz. Put an oscilloscope on the audio while feeding an unmodulated
carrier
Hi To All Hope everybody had a good Christmas,
While the subject was brought up, I have been having a similar experience here
at my location.
It is not on a repeater, but a simplex radio (vertex VX3000l mobile) for a base
on the natl Red Cross freq of 47 mhz.
In the daytime the receiver is
Could it be a nearby street light?
Chuck
WB2EDV
- Original Message -
From: Mike Dietrich
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, December 25, 2008 2:06 PM
Subject: Re: [Repeater-Builder] Six Meter Repeater Noise Issues
Hi To All Hope everybody had a good
No,
No strretlights, Rural area.
Mike
- Original Message -
From: Chuck Kelsey
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, December 25, 2008 1:09 PM
Subject: Re: [Repeater-Builder] Six Meter Repeater Noise Issues
Could it be a nearby street light?
Chuck
Hi Dan,
Glad to see you chimed in on this thread.
Dan Graybeal dangerousengineer...@... wrote:
The SM-512 is a service monitor that covers 1 to 512 MHz
if memory serves correctly.
I had incorrectly posted the follow up model as the SM-1024, but
it was actually the SM-1000 as later
How about touch lamps?
Chuck
- Original Message -
From: Mike Dietrich
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, December 25, 2008 2:19 PM
Subject: Re: [Repeater-Builder] Six Meter Repeater Noise Issues
No,
No strretlights, Rural area.
Mike
No, They died a long time ago.
It seems like if that was it, it would be doing all the time and not just at
night.
Mike
- Original Message -
From: Chuck Kelsey
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, December 25, 2008 1:31 PM
Subject: Re: [Repeater-Builder] Six
not even a honking big mercury-vapor yard light ?
- Original Message -
From: Mike Dietrich
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, December 25, 2008 1:19 PM
Subject: Re: [Repeater-Builder] Six Meter Repeater Noise Issues
No,
No strretlights, Rural area.
In the repeater case, disable the tx, put an ISO-T in the line with a
dummy load in place of the feed-line.
[A] Set the generator for 12db sinad or 20db of quieting.
Note the generator level.
At this point you could key the tx to see if there's anything odd in
the duplexer..Make sure the dummy
Maybe I missed something, as I am distracted this morning with the kids and
Christmas. Does the receiver interference still happen when the transmitter
is NOT on?
Try taking the transmitter to about %30-40 power and then see if you still
have the problem.
Also, get the biggest UPS you have or
n...@... wrote:
...and everyone thought I was nuts for using a Regency
scanner as a deviation monitor signal generator.
Bob NO6B
Well, it's not just because of that...
Sorry Bob... I couldn't help myself...
:-)
I myself also tried using the Bearcat, Radio Shack, Uniden and
GRE
Necessity is the mother of invention.
You are not alone in the universe my friend.
rtc.
--- In Repeater-Builder@yahoogroups.com, n...@... wrote:
...and everyone thought I was nuts for using a Regency scanner as a
deviation monitor signal generator.
Bob NO6B
: del7734 b...@... wrote:
: Hi Skipp, any luck with a manual ? looking for BK pocket
: part number and any other info. might have to build a pocket
: but I dont know the resistor value for a 10vdc batt.
: Thanks Del
Hi Del,
Well... yes and no. There's quite a story behind the Alexander
I wasnt aware that the newer chemistries needed an optimizer.
From some reading, Im led to believe the newer stuff doesnt have
memory issues due the limited charge/discharge cycles available in
some chemistries, you don't really want to cycle them too often.
I have yet to use/see/run-into an entirely 100% problem free
battery with a few commercial cell/type/model exceptions.
Most all of my/our previous problems with new technology
batteries are/were traced back to their chargers.
It's my opinion that only in fairly recent times have the
Sounds like it may be a streetlight, or some other device activated by a
photocell.
Joe
Mike Dietrich wrote:
It seems as about the time the sun starts going down, the receiver's
squelch opens and has a constant static noise for many hours but still
receives fine.
It may do it all night, I
I did a similar thing years ago to prove to the power company engineer
that the noise I was experiencing was from the power line. I used a
dual trace scope, synced on channel 1 that was taking a sample of the AC
socket in the building and put channel 2 on the speaker leads of a
scanner. I
I think the clue some of us may be missing is that the noise was even
heard with a 100uv signal injected into the system. Do I have this
correct? If so, I don't think it is transmitter noise.
73, Joe, K1ike
Does anyone have a replacement number for the Motorola M9698 regulator
transistors used in the Micor power supply. I am looking for a house
number I can order from Mouser. Our trusted repeater of many years let
the smoke out Christmas Eve. Guess Santa got to close to the tower.
73
WA5LUY
What about a switching power supply
- Original Message -
From: Mike Dietrich
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, December 25, 2008 1:19 PM
Subject: Re: [Repeater-Builder] Six Meter Repeater Noise Issues
No,
No strretlights, Rural area.
Mike
-
Hello all,
FYI, the N6DVA Mototrbo UHF repeater located within the Hollywood
Hills of southern California will be ready for IP linking come New
Years day. If you know of anyone or any group that is currently
operating a Motorola Mototrbo repeater (either UHF or VHF in digital
mode, and
HI Paul,
Yes the firmware is out for the new Motorola XPR8300 repeaters and yes you
can have several repeaters on the same channel and you have 15 different
color codes to assign to the repeaters. This is the same way I use my
commercial system with three different hill top sites and the same
We had a similar problem years ago with a six meter repeater in Virginia.
Problem was the site did not have a good ground and static would build up on
the tower and antenna and cause all kind of noise on the receive signal. At
first thought it was desense. Very difficult to get a good ground
When I lived by the ocean in Southern California,
I would watch the corona glow on the power line
insulators evenings when it was damp.
Mike Dietrich wrote:
Hi To All Hope everybody had a good Christmas,
While the subject was brought up, I have been having a similar
experience here
The M9698 pass transistor seems to have been used only in the TPN1151A power
supply, which was used in relatively few Micor stations. Once I figured out
what power supply used that transistor, I found that its complete part
number is 4800869698. It is still available from Motorola Parts for
Thank you Eric for the quick reply. I thought after I made the post I
should have included the PS number.
73
Wayne WA5LUY
--- In Repeater-Builder@yahoogroups.com, Eric Lemmon wb6...@...
wrote:
The M9698 pass transistor seems to have been used only in the
TPN1151A power
supply, which was
--- In Repeater-Builder@yahoogroups.com, Chuck Kelsey wb2...@...
wrote:
I have an old Bullet power supply built from a kit (anyone remember
those?)
that uses the 723. You can short the output time and time again and it
simply folds back.
heheheh I have one of those still in service on a
I have an Astron RM-35M (35Amp) that I just tested by shorting the output
and it doesn't blow the fuse. I think I would be looking for something in the
primary circuit that might be shorting like the transformer primary or the
surge arrestor or maybe the wiring. I have seen transformers
At 11:06 AM 12/25/08, you wrote:
Hi To All Hope everybody had a good Christmas,
While the subject was brought up, I have been having a similar
experience here at my location.
It is not on a repeater, but a simplex radio (vertex VX3000l mobile)
for a base on the natl Red Cross freq of 47
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