At 02:55 PM 31/05/2008, you wrote:
Hello Ron,
The audio emphasis for FM is a different issue. When I put the
discriminator output from the Mastr II receiver on a analyzer you can
clearly see a spike way out at 455khz which I believe is the IF
frequency in the receiver.
This controller has a
One would think the input to your controller is already bandpass
filtered for the super sonic audio frequencies it needs to perform
squelch gating.
Is there a possibility of a dc component on the tap-off point that is
influencing the input to the controller or...is the tap off point at
such a
I checked yesterday and we are getting audio off the Vol/Squelch Hi
pin as most people do. We wired it up instead using the RUS signal
and a transistor and disabled the smrt squelch in the controller and
it's working like a champ!
Yesterday myself and a couple other guys lugged this thing up
At 6/6/2008 14:42, you wrote:
I checked yesterday and we are getting audio off the Vol/Squelch Hi
pin as most people do. We wired it up instead using the RUS signal
and a transistor and disabled the smrt squelch in the controller and
it's working like a champ!
I don't recall ever seeing any 455
Whoa, where did we get off on voters?
I asked the question originally based on a conversation I had with
Pacific Research. I'm using their RI-300e controller which has been a
solid controller for me on several other repeaters, but I've never
tried to interface to a Mastr II. With the
Willis M. Hagler wrote:
Whoa, where did we get off on voters?
I asked the question originally based on a conversation I had with
Pacific Research. I'm using their RI-300e controller which has been a
solid controller for me on several other repeaters, but I've never
tried to interface
--- On Wed, 6/4/08, Willis M. Hagler [EMAIL PROTECTED] wrote:
From: Willis M. Hagler [EMAIL PROTECTED]
Subject: [Repeater-Builder] Re: 455khz filter for Mastr II discriminator audio
To: Repeater-Builder@yahoogroups.com
Date: Wednesday, June 4, 2008, 5:54 PM
Whoa, where did we get off
Thank you Nate, this is getting mainly to what I wanted to know (and
am still interested to know) though.
I'm already finished wiring up this controller using the RUS line + a
NPN transistor to drive the CAS input on the controller for this
particular project. At any rate the education about
Willis M. Hagler wrote:
I'm not terribly familiar with the nuts bolts (so to speak) of the
components so was unsure if the various styles of inductors all did
the same thing and I was concerned once I looked and found what
appears to be a pretty radical variance in size of available
Willis,
One point on inductors...they do have a frequency rating. This is
because of the capacitance produced between the coil windings. This
total cap and inductance can make the inductor become resonance and then
start to look like a capacitor as one goes higher in freq. Same happens
I'll put it on the analyzer again and look but I'm pretty sure there's
a pronounced spike in the discriminator output up around 450khz.
There is, without a doubt, some unexpected high frequency noise on the
discriminator audio there that's throwing off the offboard squelch.
Why in the world
Willis M. Hagler wrote:
Well, I don't have many answers for you. I am new in this field and
trying to learn and am sharing what I have heard from others who claim
to have had this problem with a Mastr II. The gentleman at Pacific
Research who manufactures the controller has write up on
- Original Message -
From: Nate Duehr
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, June 03, 2008 3:25 PM
Subject: Re: [Repeater-Builder] Re: 455khz filter for Mastr II discriminator
audio
Willis M. Hagler wrote:
Well, I don't have many answers for you. I am new in this field
Paul Plack wrote:
Nate, you're usually on the money with your observations, but I have to
disagree here. I think I recall seeing circuit descriptions in service
manuals which mention low-pass filtering to keep ultrasonics out of
audio power amps. If you pick off a signal ahead of the audio
At 6/3/2008 14:25, you wrote:
Willis M. Hagler wrote:
Well, I don't have many answers for you. I am new in this field and
trying to learn and am sharing what I have heard from others who claim
to have had this problem with a Mastr II. The gentleman at Pacific
Research who manufactures
Since both you Jeff asked the same question, I thought I'd
speculate.
My question was rhetorical and tounge-in-cheek...I wasn't looking for an
answer as I already knew it.
Noise squelches generally start with a HPF of some sort followed by a
detector post-detector filter. The cutoff
Hi Guys,
Well, I don't have many answers for you. I am new in this field and
trying to learn and am sharing what I have heard from others who claim
to have had this problem with a Mastr II. The gentleman at Pacific
Research who manufactures the controller has write up on this in their
manual
Hello Ron,
The audio emphasis for FM is a different issue. When I put the
discriminator output from the Mastr II receiver on a analyzer you can
clearly see a spike way out at 455khz which I believe is the IF
frequency in the receiver.
This controller has a auto-squelch feature (it does not use
Mark,
Could you describe EXACTLY where on the MASTR II you are pulling audio
from and what type of audio (discriminator/pre-emphasized or regular/
de-emphasized) your voter is expecting?
Like everyone else who's responded so far, I've never seen and extra
audio from the IF of a MASTR II
At 5/31/2008 13:55, you wrote:
Hello Ron,
The audio emphasis for FM is a different issue. When I put the
discriminator output from the Mastr II receiver on a analyzer you can
clearly see a spike way out at 455khz which I believe is the IF
frequency in the receiver.
This controller has a
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