--- In Repeater-Builder@yahoogroups.com, "skipp025" <[EMAIL PROTECTED]>
wrote:
>
> Bob,
>
> Were you using the standard generic 3AG glass fuse..? Was it a
fast
> or slow blow..? If you still have the dead fuse... who is the
mfgr?
>
> It takes quite a bit to kill the diodes or a bridge. Re
At 04:56 AM 02/12/07, you wrote:
>Peter,
>Thanks alot.
>I downloaded the manual from the Repeater Builders site but the
>pages that show the schematic are blank. Let me know
>
>N3GH
>George
Unfortunately we are limited to posting what we are given. If someone
has the schematics, and sends them to
--- In Repeater-Builder@yahoogroups.com, "Brian Rau" <[EMAIL PROTECTED]>
wrote:
>
> I'm putting together a portable "suitcase" repeater for our search
and
> rescue team, using Icom F121 radios per this article:
>
> http://www.repeater-builder.com/icom/repeater-mod-for-icom-ic121-
221-series.rtf
Welcome to the real world of specmanship.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Kevin Custer
> Sent: Monday, February 12, 2007 8:05 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-
Fred,
Sorry, I don't really know anything about them. I had a Comet coupler on my
repeaters when they were on the short tower, now on the tall tower I use the
old Microwave Associates cross-band couplers. I use the panel mounted TXRX
at the bottom split them back out to the receive/transmit com
I was asking about the Maxrad cross band coupler.
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Paul Finch
Sent: Monday, February 12, 2007 9:29 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Combining antennas.
Fred,
I have heard they are not really good for depleting but I have used a knock
off of a dual band antenna on my two repeaters when it was on my 60 foot
tower at my house, it worked good enough but now on my commercial site I use
the DB antennas. I only have 12 antennas up there right now, the
I am not sure if things had to be tuned slightly different or not. I saw one
many years ago and I don't remember the details of it.
You might give the DB group a call if they still exist.
Sinclair made some antennas like that on special order too. They did some
just stacked one complete antenna a
That is my understanding, however DB products have been bought out & I think
the whole line will be or has been discontinued. I'm wondering it they just
stuck both antennas on a mast & shipped it? Or did they have to do some
tweaks?
Fred N4GER
-Original Message-
From: Repeater-Bui
At 06:30 PM 2/12/2007, you wrote:
> the capacitor and regulator had hundreds of ohms across them.
Is a Maxrad good enough?
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Paul Finch
Sent: Monday, February 12, 2007 11:19 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Combining antennas.
Fred,
DB Products use
All the pass transistors test good. No shorts to
ground or from emitter to collector.
The positive terminal of the diodes has 0 ohms to the
negative terminal of the power supply. I'm sure it's
the diodes; the capacitor and regulator had hundreds
of ohms across them.
Bob M.
==
--- Kevin Custer
I would have gladly run the supply loaded to 28 amps
if the resistors could take it. They couldn't. They
were heating the room after several minutes, and took
half an hour to cool off after that. I did the best I
could with the equipment available. I need about 400
watts-worth of load to test these
At 05:23 PM 2/12/2007, you wrote:
'
I'd guess it isn't the diodes, but is one or more Pass Transistors shorted.
<---Either way, I suspect metal migration is involved.
Ken
(remember the promise of unlimited life semiconductors? Now you know
why power devices don't live forever, even if operat
His failure is hardly due to running the supply right at its maximum
continuous rating.
NEXT?
<---I would submit that metal migration within the diodes was a
factor in their failure. (I first heard about this when I worked at
TRW in the 1970's and RF power transistors were still kinda "
At 2/12/2007 03:05 PM, you wrote:
> > True, but the original question was if the noise figure of a
> > preamp was
> > degraded by the poor input match looking into the preamp
> > itself, & the
> > answer is no.
>
>Bob,
>
>Actually, my question wasn't in regard to the NF of the preamp itself,
>but
At 05:04 PM 2/12/2007, you wrote:
>His failure is hardly due to running the supply right at its maximum
>continuous rating.
>NEXT?
<---I would submit that metal migration within the diodes was a
factor in their failure. (I first heard about this when I worked at
TRW in the 1970's and RF power
> "Bob M." <[EMAIL PROTECTED]> wrote:
> Well, I know that the transformer makes heat all by
> itself, but in the repeater cabinet, a fan is blowing
> directly on the back of the supply and I've never had
> anything get hot inside in over 5 years of operation
> (except for the MaxTrac exciter runni
So? The power supply manufacturer plainly states 25 amps CONTINUOUS.
That, in my book means 24/7/365, in which he doesn't have that kind of
current draw.
He said the repeater was idle, it keyed up and before the ID went
through, blew up.
His failure is hardly due to running the supply right at
Well, I know that the transformer makes heat all by
itself, but in the repeater cabinet, a fan is blowing
directly on the back of the supply and I've never had
anything get hot inside in over 5 years of operation
(except for the MaxTrac exciter running at 6 watts,
but the fan keeps it cool too).
I
> "Bob M." <[EMAIL PROTECTED]> wrote:
> Someone else mentioned that 25A is the limit for
> continuous use. Yup, I'm not disagreeing. However it
> should be capable of that load for hours at a time.
The heatsink temp will tell you the real story. Astron Linear
Power Supply heatsinks are not "well
Look for the direct email I sent you RE: a Maxtrac.
At 12:53 PM 2/12/2007, you wrote:
>Someone else mentioned that 25A is the limit for
>continuous use. Yup, I'm not disagreeing. However it
>should be capable of that load for hours at a time.
<---Well, under the best of conditions, probably. But think about it
- you're pushing something pretty
I am looking for a Motorola Maxtrac or Mitrek Low band mobile to bring
down to 10 meters for adding to my VHF repeater . If you have one
please email the details direct to [EMAIL PROTECTED] - thanks and 73
from a long time but quiet member
> True, but the original question was if the noise figure of a
> preamp was
> degraded by the poor input match looking into the preamp
> itself, & the
> answer is no.
Bob,
Actually, my question wasn't in regard to the NF of the preamp itself,
but rather the resulting NF (system NF) due to th
On 2/12/07, Bob M. <[EMAIL PROTECTED]> wrote:
> Someone else mentioned that 25A is the limit for
> continuous use. Yup, I'm not disagreeing. However it
> should be capable of that load for hours at a time.
We run a mixture of Astron supplies and the stock GE supplies, and
almost all of them are r
It was a standard 8A generic 3AG glass fuse. It didn't
blow explosively; it just got soft and opened. When I
put a new fuse in, it blew instantly with a burst of
molten metal coating the insides of the glass.
Fuse quality should not be of concern at this point.
The fuse shouldn't blow with about 4
/At 11:06 AM 2/12/2007, you wrote:
>Some of the regular readers may recall I had an RS35M
>(bought new in 2002) blow its diodes in July 2006.
>These were two 35A, 50V bridges made by Diotec. Astron
>only uses the positive half and wires them in
>parallel. I replaced these with Vishay GBPC35
>recti
Well you are running that supply right at maximum rating of 25 amps.
The 35 amp rating is an intermittent one of 5 minutes on 5 minutes off.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Bob M.
> Sent: Mond
At 2/11/2007 08:27 PM, you wrote:
> >Ponder this Bob (and anyone else). Assume the preamp input is connected
> >directly to the output port of the isolator. For the sake of argument, say
> >that the preamp has a NF of 0.5 dB, and 6 dB input return loss. The power
> >transfer from isolator output t
Bob,
Were you using the standard generic 3AG glass fuse..? Was it a fast
or slow blow..? If you still have the dead fuse... who is the mfgr?
It takes quite a bit to kill the diodes or a bridge. Replacing
the mentioned with a higher capacity type is probably a good idea
but you should also
Some of the regular readers may recall I had an RS35M
(bought new in 2002) blow its diodes in July 2006.
These were two 35A, 50V bridges made by Diotec. Astron
only uses the positive half and wires them in
parallel. I replaced these with Vishay GBPC35
rectifiers, tested the supply, and put it aside
Reminds Me. I could ue a small Alignment tool fot adjusting The VCO Coil
L104 on a GE Phoenix. Make this a Golden Request. Its avery Small Square
tool.
Truly. We could very well cease talking about this Subject is getting Old
now.Thanks
Wesley AB8KD
I've had to work on a number of radios where someone went in
and "tightened those screws"...
Dad used to get cameras where the owner had tried to fix them.
Once or twice, the victim arrived in a paper bag, full of loose parts
and screws.
Arrgghh...
I used to do TV repair in hawaii, back in the good old days.
"Major Mac" was a competing outfit. I could always tell when they had
worked on a set before. Broken convergence coils hanging by their
wires, cracked tuning slugs, solder joints that looked like they'd been
done with a Bic.
Defi
> For those who are inquiring minds and not up to all of the
terminology, what
> is a "golden screwdriver"?
Used to fix things, as in "fixed like a cat".
Now that it's "fixed", it will never work again!
Great news for the home team...
I've located and purchased (ordered) the parts to fix the Icom
IC-RP2210 Repeater Receiver.
Thanks for the replies already posted.
cheers,
skipp
skipp025 at yahoo.com
www.radiowrench.com/sonic
Fred,
DB Products used to make, probably still do, a antenna just like you
described. Just need a crossband coupler mounted at the antenna or two
coaxes going to your equipment. Works well, don't use a cheap crossband
coupler though. Buy a commercial grade one and you will be happy.
Paul
--
Dale,
There is a whole list of options that I have rejected before deciding on
combining antennas. Most having to do with keeping a low profile. It's
kind of like the "been there done that" sort of thing. I really need
commits on my original question.
Thanks
Fred N4GER
-Original Message-
Re: Icom Repeater Repair fun... (parts hunting)
The VCO is working just fine thanks... I've got a bad pll chip
and the voltage regulators are right on the money.
If I can't find the pll chip I might have to replace the receiver
or construct an LO... yes probably a crystal type. Doesn't have
I'm putting together a portable "suitcase" repeater for our search and
rescue team, using Icom F121 radios per this article:
http://www.repeater-builder.com/icom/repeater-mod-for-icom-ic121-221-series.rtf
I've got the two radios together and working, my question is: has
anyone had success with th
I have never seen PLL chips go bad in anything. They should only do it
if the voltage regulators are fried and they are over volted. Check
your VCO transistor and buffers.
On 2/12/07, Glenn Little WB4UIV <[EMAIL PROTECTED]> wrote:
> Replace the noisy PLL LO with a quiet crystal LO. Easy surgery, b
Peter,
Thanks alot.
I downloaded the manual from the Repeater Builders site but the
pages that show the schematic are blank. Let me know
N3GH
George
--- In Repeater-Builder@yahoogroups.com, "Peter Burgess"
<[EMAIL PROTECTED]> wrote:
>
> I will have a look in my collection. I seem to remember
Replace the noisy PLL LO with a quiet crystal LO. Easy surgery, better
noise figure on receive and less phase noise on transmit. You probably have
no need to have an agile receiver.
73
Glenn
WB4UIV
ARRL Technical Specialist
At 01:26 AM 02/12/07, you wrote:
>Well...
>
>I've got an Icom IC-RP221
--- In Repeater-Builder@yahoogroups.com, "Fred Flowers"
<[EMAIL PROTECTED]> wrote:
>
> Have you thought of using 2 Mtr antenna for both 2 mtr & 70
Centimeter Or even a duel band-er & only using one antenna . Just a
thought .
DaleN8SAC
>
> Has anyone tried to combine
I will have a look in my collection. I seem to remember having 1 10 years ago.
re above. I have found 2 manuals complete with circuit diagrams and board
layouts. also has programming instructions
Cheers Peter
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