Jeff DePolo wrote:
The changes that occur are at source end inside the PA. The ideal load Z
for the output devices changes when you vary the output power. If you
tune the Z-matcher to present a load Z to the devices that results in them
operating at maximum efficiency at at 100 watts, and
--- In Repeater-Builder@yahoogroups.com, kc7stw kc7...@... wrote:
I would like to thank everyone who has posted. This helps out quite allot. I
have been a big fan of this forum, and the repeater builder site.
Once again. Thanks!
I have a mastr EXEC II receiver (33 split) that I can't get sensitivity to
increase.
I replaced the fet as outlined below on the mastr II query.
No joy though.
I'm using an am/fm-1200s to tune the receiver.
.5~1uv is where the receiver is coming to life.
I have a couple vhf and uhf exec II
Although an infrared temperature meter will provide some very useful
information, perhaps a more practical method of determining PA efficiency is
the use of a DC ammeter and a accurate RF power meter. Since PA efficiency
is the ratio of power out to power in, optimizing that ratio is
well here goes i would like to know if any has or knows where ican find the
plug in controlercard no 417385g1 kf4kqe
New London Technologies has 19D417385G1 Control Boards in stock at $35 each,
here:
https://www.newlondontechnology.com/ss/index.php?searchstring=19d417385gx=
2y=5
Note that the G1 board is for applications without Channel Guard; the G2
board is for applications with CG, and those boards cost $85
Do the two front end trimmer caps still have some mesh left, or are they
at minimum capacitance? That may be your problem.
Chuck
WB2EDV
- Original Message -
From: Chris Curtis demo...@rollanet.org
To: Repeater-Builder@yahoogroups.com
Sent: Friday, June 26, 2009 10:45 AM
Subject: RE:
I looked through my notes on the UHF version and I did'nt see anything tricky
there. What do you mean by specialized equipment?
73 de W1EL
Eric Lowell
Eastern Maine Electronics Inc.
48 Loon Road
Wesley ME 04686
eme@starband.net
www.satnetmaine.com
207-210-7469
--- On Thu, 6/25/09, Eric
I just bought an IFR FM/AM 1500 service monitor. Now I need a user's
manual. The service manual on RB and the applications booklet on RB
are helpful, but the user's manual would be a big help. Please let me
know if you have one that could be purchased or could be scanned for
the RB manual archive.
Yes, I can help you.
K7IJ
In a message dated 6/26/2009 11:14:03 A.M. Pacific Daylight Time,
jtran...@cox.net writes:
_Attachment(s)_ (mip://027f0310/default.html#TopText) from John Transue
included below]
I just bought an IFR FM/AM 1500 service monitor. Now I need a user's
manual.
Hi Folks,
Here's the tale:
Got a 'free' set of cans donated to our ham repeater project.
The tags inside say it was originally in the 162 range, but had
been re-tuned to the 154 range.
Called the new owners of the dB product duplexer line, but it was
so old that they had no info. Was a 'SP'
You are correct sir, no mesh.
Isn't that that pits.
So I take it I'll be removing some windings from the underside of said
trimmer caps?
Or is there an easier route to sensitivity?
=]
Chris,
Kb0wlf
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
You could remove a turn (maybe even 1/2 turn) or you could change out the
trimmer or add a series cap. Yep, it stinks when that happens. Many times
another front end will work fine.
Chuck
- Original Message -
From: Chris Curtis demo...@rollanet.org
To:
Nate Duehr wrote:
Turning them down (as we've all noted previously) does NOT always mean
that they run cooler due to the aforementioned inefficiency built in
to them, so to speak. We've all seen that one with an IR temperature
measuring device pointed at the heatsink and/or power
Did you first test it on it's original frequency before you retuned it?
It may have had a problem from the start.
Years ago, I tuned over 25 MastrII radios I got from the local state
police to 52.525Mhz as a project. Probably 2 or 3 of them would just
not tune up properly in the ham band.
Yes.
I have 2 front ends to work with.
Both showed around .3uv or so @ 46.xxmHz
Chris,
Kb0wlf
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
buil...@yahoogroups.com] On Behalf Of Joe
Sent: Friday, June 26, 2009 3:45 PM
To:
A good question for you:
What should I be looking for on these as far as sensitivity goes?
Should I be happy if I see .35 or should I be able to get a little more?
Chris
Kb0wlf
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
buil...@yahoogroups.com] On
Hmm, Reject only cans were found in Hybrid Ring duplexers. Is the
manufacturer Sinclair?
On Fri, Jun 26, 2009 at 1:10 PM, tahrens301tahr...@swtexas.net wrote:
Hi Folks,
Here's the tale:
Got a 'free' set of cans donated to our ham repeater project.
The tags inside say it was originally in
Hi Lowell,
Near the front end helical section of the reciever there are two crystals and a
trimmer near them Also, 3 coils that need alignment. There are the ones I am
talking about. I have a feeling that these are the ones that are not aligned
properly. The reciever is very sensitive-about.12
What frequency are you on?
I'll need to look at a schematic to come up with much.
73 de Eric
Eric Lowell
Eastern Maine Electronics Inc.
48 Loon Road
Wesley ME 04686
eme@starband.net
www.satnetmaine.com
207-210-7469
--- On Fri, 6/26/09, w4sef w4...@localnet.com wrote:
From: w4sef
I think that I may have just what you need. It's called Application
Notes for the IFR-1500. I started to scan it, but we are having severe
lightning storms in the area and my UPS switched a few times. In the
Repeater-Builder area on YahooGroups, look at:
The manual states .25uV using 12-dB Sinad method, or .35uV using the
Quieting Method. I've always used the Sinad method and, to the best of
my ability to remember, I was able to get .25uV or even a little better.
Joe
Chris Curtis wrote:
A good question for you:
What should I be looking for
Yahoo! Groups Links
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This message was checked by NOD32 antivirus system.
http://www.eset.com
No - dB products
--- In Repeater-Builder@yahoogroups.com, DCFluX dcf...@... wrote:
Hmm, Reject only cans were found in Hybrid Ring duplexers. Is the
manufacturer Sinclair?
On Fri, Jun 26, 2009 at 1:10 PM, tahrens301tahr...@... wrote:
Hi Folks,
Here's the tale:
Got a 'free' set
What Jeff recommends is adjusting the
impedance matching
device and/or the power setting so as to optimize the
efficiency. In other
words, get more power to the antenna and reduce the amount of internal
heating. It may turn out that the point of optimum efficiency
is not at the
rated
Chuck's got you going down the right path. At 51 MHz, you probably only
have to take one turn off of each of the first two coils. At 52 MHz or
higher, you might have to take off two. You need a lot of heat to get the
casting open (hint: a soldering gun, even a 300 watt Weller, ain't gonna cut
Ok, now lets do the opposite. Set the spec analyzer to 147.1 tune
it up. Set up the sig gen @ 147.7 UH OH, 2.5dB loss.
The stubs (which I take it you removed) alter the pass response. They're
really notch cavities. Adding the stubs will change the response adjacent
to the notch from high
Does anyone know what the name of the Antenna Company is, who was
composed of Ex-Motorola employees?
Also, if their still in business?
Paul Metzger
Looks like I found it. They are the Antenna Factory.
Paul Metzger
Jeff,
We're on the same wavelength, and your explanation is easier to understand
than mine.
Several years ago, my radio club was running a Yaesu FT-2500M transceiver as
the 2m side of a packet node. Since we had a nice hilltop site and a DB-225
antenna, I set the power level at the lowest of
I'm looking for any information on a Selectone ST-815 mobile DTMF decoder.
It's a small box, 2.75x1.5x2, with a monitor/reset button and a horn button
on the front. I don't see any info on the Selectone/Com-Spec website.
I need to know what the pin out on the back is and how it is programmed.
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