radi...@aol.com wrote:
Sucess!
I completely cleaned and re tinned my Weller 8100 tip, added some
solder, and got heat transfer to pop it up. I was not aware of the
fish paper that the wires came thru. Now to troubleshoot the amp. It
probably has some blown transistors as well as the cooked
Tom Parker wrote:
Why has no one suggested replacing the guts of this beast with a
Mitrek PA?
Why?
Kevin
The cable length issue is a brother to if you don't like
your VSWR, change the point along the transmission line where
you're measuring it.
I don't know what that's supposed to mean. The VSWR on the line is the same
no matter where along the line you measure it. If you're using a meter
Tom Parker t...@... wrote:
Why has no one suggested replacing the guts of this beast
with a Mitrek PA?
Only if the Mitrek VHF PA is the same animal as some Micor
PA's are reported to be.
... and that you can a used Mitrek (with the matching parts)
as easily as you can find a used Micor
These were used with Micor stations that had the optional wattmeter kit
installed. The cable connected to the remainder of the kit whch consisted of a
meter, foward/reflected power switch and calibration pot(s). The element is
the same one that is used with the Motorola wattmeter and the
Just got a Motorola cabinet with the above power supply. Does anyone know the
ratings of this supply, or what equipment used it? Is it worth keeping or just
junk ?
Henry
And a new perspective on transmission lines.
I didn't think it was worth responding to, Jeff.
AC WA9ZZU.
From: Jeff DePolo j...@broadsci.com
To: Repeater-Builder@yahoogroups.com
Sent: Fri, August 6, 2010 8:23:09 AM
Subject: RE: [Repeater-Builder] Coax length,
Henry,
The TPN1185B is a 500 watt (35 amps at 14 volts) battery charger power
supply used in 75/100/110 watt MSF5000 stations. It is a ferro-resonant
unit that is reliable but rather inefficient.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
Grab your Smith chart! LOL
- Original Message -
From: allan crites
To: Repeater-Builder@yahoogroups.com
Sent: Friday, August 06, 2010 12:46 PM
Subject: Re: [Repeater-Builder] Coax length, etc.
And a new perspective on transmission lines.
I didn't think it was
Jeff was correct to question. I was vague. What I should have said
was indicated reflected power, not VSWR.
But good luck trying to determine an accurate VSWR based on erroneous
reflected readings.
Let the boo birds squawk. Keep questioning, Jeff.
73, Russ WB8ZCC
On 8/6/2010 1:07 PM,
How about duty cycle? Do you think this set up would transmit 7x24?
--
Tim
:wq
On Jul 28, 2010, at 7:46 PM, James Adkins wrote:
I am using the Motorola CDM series of radios for 420-425 MHz links from
voting sites. They make a low-split UHF split that covers 403-470 MHz out of
the box, no
Can somebody please explain how the insertion loss of a duplexer is properly
measured using a HP 8920A (with specan). I'm pretty new to this instrument as
well as duplexer work but am eager to learn. Thanks.
73
Martin
P.S.: Is it correct that a duplexer that has 40 dB isolation in each leg
Can somebody please explain how the insertion loss of a duplexer is
properly measured using a HP 8920A (with specan).
1. Connect duplexer Tx port to duplex port on 8920.
2. Connect antenna port on duplexer to antenna port on 8920.
3. Go to spectrum analyzer screen.
4. Set center
Kevin,
I am using your coaxial matching section on a couple of antennas with good
results. Great article on RB and not too hard to build
--- In Repeater-Builder@yahoogroups.com, Kevin Custer kug...@... wrote:
Russ Hines wrote:
Thanks, guys, a good topic and one that always seems to come
Oh, I guess I should have thrown in a couple of generally-applicable
guidelines that should go without saying when using ANY sweep gear like
this:
- terminate the unused port on the duplexer with a high-quality 50 ohm load
- it's a good idea to use 6 dB or greater pads on inputs and outputs of
In addition to what Jeff said in his posts, I usually run a test sweep on my
HP8924 connecting the two cables together with a double female of the
appropriate type.
The result should be a flat line sweep but will usually show some amount of
loss relative to the generator level/reference level.
Can somebody please explain how the insertion
loss of a Duplexer is properly measured using a
HP 8920A (with Spectrum-Analyzer).
Jeff DePolo j...@... wrote:
1. Connect duplexer Tx port to duplex port on 8920.
2. Connect antenna port on duplexer to antenna port on 8920.
I have to
Thanks guys I'll have another go tomorrow (it's 0.30 a.m. in my place now).
Concerning the isolation question I was obviously wrong, I came up with the
idea because the duplexer is a commercial tetra duplexer of which I had the
factory test certificate filed and only remembered something like
Thanks Buch, I'd like to build the link so that it transmits all the time. That
minimizes key up delays and reduces intermod on the hill. So need something
that can key down forever.
--
Tim
:wq
On Aug 6, 2010, at 3:13 PM, Glenn (Butch) Kanvick wrote:
Hello Tim.
Yes, the CDM's probably will
Hello,
Does anyone have a 5C for the PLL exciter they want to sell?
This is the larger Icom.
Thanks
Steve
--- In Repeater-Builder@yahoogroups.com, Doug Bade k...@... wrote:
There are 5C elements made for that exciter. you just do not have one..
From:
Martin,
The other 40dB is hiding in the lower regions of the sweep.
I'll try to describe what to do from memory but I may be a bit off target.
The bottom of the sweep should look a bit wide and ragged, not a smooth line.
Drop the Reference level down to -40 or -50. You should now see the
bottom
If you have a RX 5C or 2C -or- a phase 5C or 2C ICOM, you can transplant
the compensation circuit into a EC PLL ICOM. There are only 3 pins
involved. There is some degree of skill required as the compensator
circuit is built on a ceramic/glass substrate and is somewhat fragile.
Scott
Scott
There is a process I use to easily see which stage is
bad. Reply if you need more help.
Maybe you'd consider posting it here? Always looking for better ways to do
things.
Tom DGN
--- In Repeater-Builder@yahoogroups.com, Kevin Custer kug...@... wrote:
radi...@... wrote:
Sucess!
I
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