At 03:38 PM 11/25/09, you wrote:
Hi Mike,
Thanks for the info.
Yes, I've cleaned it up good... I use a q-tip with
a baking soda/water combo, then wick solder on
the pad till it flows... sometimes gotta scrape a
shiny spot first. Then soldersuck the pad
clean up with wick. Then another qtip
Folks,
Got this Zetron 48 at a hamfestnow, I need to unlock it...can you do it
over the air like a 38A? I have the book but it is not clear at allNeed
info on how to program this beastHappy Thanksgiving.
Ron
Hi Skip,
Happy Thanksgiving first off. Go to the Angle Linear web site and read
Chip's documentation he has provided. I don't know too many people that has
a better product than him and his stuff if installed correctly works like no
other.
Mike Mullarkey K7PFJ
From:
On the spectras, if you keep using the radio after the caps go bad, it can
damage the audio ic chip.
The popping is one of the symptoms as well as distorted audio.
Another thing I have seen is a tantalum chip cap that is the isolator cap
between the audio chip and the previous chip.
Just follow
k7...@... Mike wrote:
Hi Skipp,
Hello back,
Happy Thanksgiving first off. Go to the Angle Linear
web site and read Chip's documentation he has provided.
I don't know too many people that has a better product
than him and his stuff if installed correctly works
like no other.
Skipp,
It seems as if both of your answers suggest that the preamp be installed in
the same place- between the duplexer and the bandpass cavity. Perhaps your
intent for the second situation was to suggest that the preamp be placed
between the bandpass cavity and the receiver input. The site
I've got to lay off the hard stuff so early in the
morning... please allow me to correct the following.
I'd venture to say... if your receiver front end is
of decent Q (quality) and reasonably narrow band-width
along with a decent duplexer... then the preamp might
best go after the
The main way of thinking is that you want to put the pre-amp after the band
pass filter.
The reason for this is that if it is before the b/p filter, it amps anything it
sees, noise and unwanted stuff alike.
If its behind the b/p filter, it only amps the signals that are left and need
it.
You
The recent discussion on Spectra audio popping prompts this post.
Has anyone cured the audio popping on a GE Custom MVP. The speaker pops every
time that the squelch opens. I have several radios that this happens on, some
worse than others.
Chuck
WB2EDV
Anyone have a spare bandpass filter tunable for the UHF amateur band like a DCI?
Thanks!
Alan
- Original Message -
From: Mike Dietrich
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, November 26, 2009 10:09 AM
Subject: Re: [Repeater-Builder] Re: pre-amp placement
Hi Eric,
Eric Lemmon wb6...@... wrote:
Skipp,
It seems as if both of your answers suggest that the
preamp be installed in the same place- between the
duplexer and the bandpass cavity.
You caught that just as I was posting the correction.
Perhaps your intent for the second
Mike Dietrich m.dietr...@... wrote:
The main way of thinking is that you want to put the
pre-amp after the band pass filter.
The reason for this is that if it is before the b/p
filter, it amps anything it sees, noise and unwanted
stuff alike. If its behind the b/p filter, it only
--- On Wed, 11/25/09, W3ML w...@arrl.net wrote:
From: W3ML w...@arrl.net
Subject: [Repeater-Builder] pre-amp placement
To: Repeater-Builder@yahoogroups.com
Date: Wednesday, November 25, 2009, 10:46 PM
Hi,
I have now read two different things about where to put the
pre-amp.
One says
Advanced Receiver Research makes very good low
noise preamps as so do several other companies.
And we've seen Angle Preamps mentioned in these
post. I wanted to make sure the GLB Series of
Preselector Preamplifiers were mentioned. I really
like the GLB Rx pre-selector preamp products:
Thanks Glenn,
I think I will it where it is since it is a Adv Receiver Research Gasfed.
I don't remember the article mentioning helical resonators.
Was just wondering why there would two different places in the articles.
73
John
--- In Repeater-Builder@yahoogroups.com, Glenn Little WB4UIV
Ralph you bring up a good point of thought.
The ham that built our repeater placed the Decibel Products 4002 Bandpass
behind the Wacom 6 can duplexer and then followed by the ARR Gasfed P144VDG to
the radio.
Now where he built it was his tower site (an old ATT brick building) full of
I just read back what I typed while XYL was talking to me. You could tell I
missed breakfast and she was talking about food as it is not a gas fed, but
GaAS FET preamp.
Now only 4 more hours before I get fed.
Have a great holiday.
73
John
Most people gas after their fed.
Alan
- Original Message -
From: W3ML
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, November 26, 2009 11:37 AM
Subject: [Repeater-Builder] RE: preamp
I just read back what I typed while XYL was talking to me. You could tell I
At 11/26/2009 07:31, you wrote:
Mike Dietrich m.dietr...@... wrote:
The main way of thinking is that you want to put the
pre-amp after the band pass filter.
The reason for this is that if it is before the b/p
filter, it amps anything it sees, noise and unwanted
stuff alike. If its
At 11/26/2009 07:43, you wrote:
Advanced Receiver Research makes very good low
noise preamps as so do several other companies.
And we've seen Angle Preamps mentioned in these
post. I wanted to make sure the GLB Series of
Preselector Preamplifiers were mentioned. I really
like the GLB Rx
At 11/26/2009 08:14, you wrote:
Thanks Glenn,
I think I will it where it is since it is a Adv Receiver Research Gasfed.
Good choice IMO. If you want to maximize your sensitivity, just make sure
your pass cavity is very low loss. If the loops are or adjusted for 2 dB
loss, you could easily
You might need to add a several DB attenuator
between
the pre amp and the receiver to keep from over
driving
the front end.
Not if you use a good receiver, or not use a preamp with
too much gain.
Bob NO6B
What defines too much gain can vary wildly. One trick I learned in
At 11/26/2009 07:14, you wrote:
The recent discussion on Spectra audio popping prompts this post.
Has anyone cured the audio popping on a GE Custom MVP. The speaker pops
every time that the squelch opens. I have several radios that this happens
on, some worse than others.
The speaker audio
I agree about the MVP audio design. After all, the Custom MVP was GE's
economy line radio, so we should not expect it to perform as well as the
Mastr II.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On
At 11/26/2009 08:30, you wrote:
Ralph you bring up a good point of thought.
The ham that built our repeater placed the Decibel Products 4002 Bandpass
behind the Wacom 6 can duplexer and then followed by the ARR Gasfed
P144VDG to the radio.
Now where he built it was his tower site (an old ATT
You are telling me what I suspected - that it's the design, not a component
going bad or failed.
Chuck
WB2EDV
- Original Message -
From: n...@no6b.com
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, November 26, 2009 12:38 PM
Subject: Re: [Repeater-Builder] MVP Audio Popping
So what is the recommendation to set the loss of the BP cavity? I have a
setting as to 3 db, 1 Db, .5 Db Etc. Running the ARR preamp on a UHF repeater,
it seems the preamp is a little too much and we get a little desense. I am only
running a 4 cavity duplexer and a notch cavity with the preamp.
A total insertion loss of about 1.0 dB works well, in my experience. With
two 8 bandpass cavities in series, this gives at least 25 dB of isolation
from the transmitter carrier at a 600 kHz split.
Bear in mind that your notch cavity has the same deficiency as the typical
BpBr duplexer- there is
Most of the time you will want as much selectivity as you can get in front
of the preamp. The only time that I can think of off hand where you might
want a filter behind a preamp is if you are getting a receiver feed from a
receiver multicoupler that has a preamp in it, giving a few megs wide
So your suggestion is to get a Band pass/reject cavity instead? Or should I get
2 for the added isolation?
keep in mind I am on UHF
de KM3W
From: Eric Lemmon wb6...@verizon.net
To: Repeater-Builder@yahoogroups.com
Sent: Thu, November 26, 2009 2:48:54 PM
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