Modulation meter accuracy?
 

How accurate are these SWR/Power/Modulation meters for modulation? I am
restoring an old TRC-455. I want to get to 100% or just under. I do have a
scope, but figured that would actually be more difficult to measure.

Vinnie S.

Modulation meter accuracy?
 

On Apr 26, 7:01 pm, Vinnie S. wrote:
How accurate are these SWR/Power/Modulation meters for modulation? I am
restoring an old TRC-455. I want to get to 100% or just under. I do have a
scope, but figured that would actually be more difficult to measure.


I think a lot has to do with the cost of the meter.
Some of the cheapo ones may be as bad as 25% tolerance... while some
of the better ones may be 15% tolerance.
The scope is a much better tool... and easy to visually see 100%. The
scope would probably be more like 2-3% accuracy.

www.telstar-electronics.com

Modulation meter accuracy?
 

On 26 Apr 2007 17:14:56 -0700, Telstar Electronics
wrote:

On Apr 26, 7:01 pm, Vinnie S. wrote:
How accurate are these SWR/Power/Modulation meters for modulation? I am
restoring an old TRC-455. I want to get to 100% or just under. I do have a
scope, but figured that would actually be more difficult to measure.


I think a lot has to do with the cost of the meter.
Some of the cheapo ones may be as bad as 25% tolerance... while some
of the better ones may be 15% tolerance.
The scope is a much better tool... and easy to visually see 100%. The
scope would probably be more like 2-3% accuracy.

www.telstar-electronics.com


Do I inject a 1 KHz tone right into the mic plug, or do I have to go thru the
mic?

Vinnie S.

Modulation meter accuracy?
 

On Apr 26, 7:16 pm, Vinnie S. wrote:
Do I inject a 1 KHz tone right into the mic plug, or do I have to go thru the
mic?

I would definately use the mic you plan to use with the rig. I usually
use 2KHz as a mid-point for audio (voice) adjustment. Then adj your
limiter accordingly. This should give you close to what you seek if
the 2KHz volume is at a reasonable level that would be representitive
of your voice.

P.S. If you had a Voicemax... you could adjust your modulation for
100%... and it would stay at 100% from 100Hz-20KHz... when you were
whispering or screaming. That's the beauty of an AGC...

www.telstar-electronics.com

Modulation meter accuracy?
 

P.S. If you had a Voicemax... you could adjust your modulation for
100%... and it would stay at 100% from 100Hz-20KHz... when you were
whispering or screaming. That's the beauty of an AGC...

I've got a old Fostex compressor I sometimes put between my scanner and
some amplified speakers. I can hear the TAC units whispering just as loud
as the dispatcher. The PRO-96 units have a built in AGC in digital APCO-25
mode. That feature won't work in the analog mode, only digital MOT-II systems.

Modulation meter accuracy?
 

On Apr 26, 11:57 pm, Scott in Baltimore
wrote:
I've got a old Fostex compressor I sometimes put between my scanner and
some amplified speakers. I can hear the TAC units whispering just as loud
as the dispatcher. The PRO-96 units have a built in AGC in digital APCO-25
mode. That feature won't work in the analog mode, only digital MOT-II systems.

Is that unit you have a "clipper"?

www.telstar-electronics.com

Modulation meter accuracy?
 

Telstar Electronics wrote:
On Apr 26, 11:57 pm, Scott in Baltimore
wrote:
I've got a old Fostex compressor I sometimes put between my scanner and
some amplified speakers. I can hear the TAC units whispering just as loud
as the dispatcher. The PRO-96 units have a built in AGC in digital APCO-25
mode. That feature won't work in the analog mode, only digital MOT-II systems.

Is that unit you have a "clipper"?

No, it's a compressor for music.

Modulation meter accuracy?
 

On Apr 28, 7:16 am, Scott in Baltimore
wrote:
Is that unit you have a "clipper"?
No, it's a compressor for music.

OK... just curious.

http://www.telstar-electronics.com/d...cialOffers.htm

Modulation meter accuracy?
 

"Telstar Electronics" wrote in message
ps.com...
On Apr 28, 7:16 am, Scott in Baltimore
wrote:
Is that unit you have a "clipper"?
No, it's a compressor for music.

OK... just curious.

http://www.telstar-electronics.com/d...cialOffers.htm



Why are you selling it again? Didn't work right?

Modulation meter accuracy?
 

On Apr 29, 10:34 am, "Yo Mamma" wrote:
Why are you selling it again? Didn't work right?

Nice try... lol
The last pre-production unit is being auctioned off.

http://www.telstar-electronics.com/d...cialOffers.htm