-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] *On Behalf Of *Doug Zastrow
*Sent:* Saturday, December 30, 2006 6:23 PM
*To:* Repeater-Builder@yahoogroups.com
*Subject:* Re: [Repeater-Builder] Re: audio equalizers for repeater
audio-circuit correct??
Bill,
What source and load impedance
Hmmm... I always thought that the resistor was on the input side.
Y'all sure this circuit is correct as it is above?
Ken Arck [EMAIL PROTECTED] wrote:
---You're right. The cap should be on the load side of the
resistor, not the disc. side.
In a receiver de-emph circuit like the GE Master
You have the facilities to do it, and you have the test equipment
to prove it. I'll let you do the work.
The time constant equation is the same, if you put the capacitor
in front or behind the resistor. In fact: You could put a 7.5K
in front of, and a 7.5K behind the capacitor to
So, how about we use a source impedance of 100 ohms, and an
audio range of 50 to 5000 cycles.. . .
How many peole know the source impedance of the discriminator
circuit? With many commercial circuits... the output is a
custom made chip by Motorhead, GE, Kenwood or similar.
The word we
Kevin Custer [EMAIL PROTECTED] wrote:
However, if the AP-50 is sourced by a driver of 100K, the
knee would be down to about 725 cycles. You wouldn't want your
pre-emphasis to end at 725 cycles.
Based on some of the audio I've heard from a few.. even brand-new
out of the box radios... it
This topic is very intersting, with out getting into big $ with the
audio eq the simulcast solutions sells. start out with a basic resistor
100k or 6.8k on the output tx audio to reduce the loading effects i had
this problem with a scom 7k to a motorola cdm 750 with the flat audio
it took a
Henry,
I see no problem here.
You have a voltage plot.
It shows approx 2.0 V @ 500 Hz, 1.0 V @ 1000 Hz, and 0.5 V @ 2000 Hz
In voltage terms - twice [or half] the voltage change does represent 6
dB - so - your circuit is working fine and would graph as a straight
line [with the expected slope]
This is something that many times gets lost in translation, and is very
important to remember.
You have covered something that I was going to touch on, but now I don't
have to...
Thanks,
Kevin Custer
nj902 wrote:
/_*In voltage terms - twice [or half] the voltage change does represent 6 dB*_/
I have uploaded an image to the yahoo repeater builder photos that
shows a sweep of the 10 K ohm + 0.22 uF [in series] deemphasis
circuit. The analyzer's generator is driving the top of the resistor
with low impedance [600 ohm] and the analyzer is measuring across the
cap with a high impedance
--- In Repeater-Builder@yahoogroups.com, Bill Hudson [EMAIL PROTECTED]
wrote:
Disc. 15K
0-/\/\/\/\/\0 output
|
|
.2 uf. (point 2
At 04:25 PM 12/30/2006, you wrote:
Hmmm... I always thought that the resistor was on the input side.
Y'all sure this circuit is correct as it is above?
---You're right. The cap should be on the load side of the resistor,
not the disc. side. As for the question about PREemphasis, the cap is
in
@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: audio equalizers for repeater
audio-circuit correct??
At 04:25 PM 12/30/2006, you wrote:
Hmmm... I always thought that the resistor was on the input side.
Y'all sure this circuit is correct as it is above?
---You're right. The cap should
-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of
Ken Arck
Sent: Saturday, December 30, 2006 4:38 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: audio equalizers for repeater
audio-circuit correct??
At 04:25 PM 12/30/2006, you wrote:
Hmmm... I
@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Doug Zastrow
Sent: Saturday, December 30, 2006 6:23 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: audio equalizers for repeater
audio-circuit correct??
Bill,
What source and load impedance are you looking
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