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A.M. SUPER MODULATOR

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A.M. SUPER MODULATOR

Picked up a couple of these on ebay and have an extra I'm not using for sale. This little board is pretty incredible. It's a modulator board that allows for up to 300% positive peaks while keeping negative peaks under 95%. I am really impressed with performance of this thing... Not just does its make you LOUD...it also allows you to go above 100% mod without distortion of exceeding 100% negative pinch off of your modulated signal looking at it on a scope. 

Like the Inovonics 222 you can taylor your positive peaks with precise assymetry control and the extra loudness you get from 100 to 125% is definatley noticeable. Just run audio into the board and hook up board your radio/transmitter. Pretty simple. The audio through this board is pretty transparent, so what kind of signal you put in is what you get out. You can read info about it hear. http://www.ebay.com/itm/Asymod-II-Hi-Fi-Asymmetrical-AM-Modulator-for-CB-HAM-Radio-Transmitter-/121724263831?hash=item1c5754dd97 I have an extra board for $95 obo...message me if interested. Comes complete with documentation. Newbie

What About Distortion?

In my experience, if you go to a 120% peak, you have ~10% of distortion. You are limited to the capabilities of the transmitter. (And the bandwidth of the receiver) That unit may be good for a suppressed carrier system (SSB) but not for modulating a full carrier.

Any level of distortion above 10% starts to get real noticeable, even in an audio amplifier/speaker system.

The Mighty "T.H.C." Tunnel Hill Control.

Radiating Wild Animals with R.F. for Years!

Not mentioned in the

Not mentioned in the description ( I may have missed it) is the load  impedance that it would like to see.

Druid Hills Radio AM-1710- Dade City, FL. Unlicensed operation authorized by the Part 15 Department of the FCC and our Resident Hobby Agent.  

I don't know but, mine sounds

I don't know but, mine sounds great with no distortion and  works like the one in this video..

http://youtu.be/p_oFSiZKsyg

I have used Inovonics, Omnia, Air tools, among may other processors and for the price this board blows them away. Works like the old Panaxis transmitter but  with way more control.

Newbie

I don't know what the load

I don't know what the load impedance it's like but ive modulated the collector and drain on a few different PA including class E and it worked great.

It would make your station

It would make your station sound Loud that is for sure.  I like how it looked on the scope.  I see they used the channel where all the folks scream and yell on CB which is channel 6.  I had to laugh at that.

Progressive Rock (Album Rock, Deep Tracks), Classic Rock

http://thelegacy.shorturl.com

More Power for Hobby Broadcasters

http://the-initiative.boards.net/

After built: How does it interface?

The video is not clear on this nor is the promo lit.

 

Druid Hills Radio AM-1710- Dade City, FL. Unlicensed operation authorized by the Part 15 Department of the FCC and our Resident Hobby Agent.  

After built: How does it interface?

The video is not clear on this nor is the promo lit.

 

Druid Hills Radio AM-1710- Dade City, FL. Unlicensed operation authorized by the Part 15 Department of the FCC and our Resident Hobby Agent.  

Not To Mention...

Most of the Part 15 transmitters do not use high level modulators.  

Most are designed to hit maybe 100%.  

Like the Wenzel circuit which modulates the tail current of a differential type amplifier output stage or those which power the final RF stage collector from the output of an audio op-amp they just won't go over 100%.

Lots of heavy clipping/limiting may make it sound louder at the expense of fidelity.

by MRAM 1500 

Charter Member - Association of Low Power Broadcasters

Chairman - ALPB

125% positive peaks with this

125% positive peaks with this boards still sounds superb with no noticeable distortion  and as the video demonstrates with the scope there is no heavy clipping involved as you would normally see in negative peak limiting scheme. Positive peaks with no baseline pinch off. 

The old Panaxis Part 15 AM transmitters

could go way over 100%.  Does anybody

remember how that worked?

Also - yup - CB channel 6 (and also 11 as I

recall) are homes to goofy overmod CB operations,

But atleast a ham or SWL can tell when 25 to about

30 MHz is open.

Brooce. "WLP"

NOISE AND STATIC RADIO

What Transmitter

What transmitter was used in this trial run?

Carl Blare

panaxis am 100 tx

Hi Guys: the panaxis am tx can have a peak of 300 % mod.

1) To see the manual

2) please visit the ALPB site

3) look on right hand side of page

4) click on equipment page 

5) download the manual

station 8

Thank you Station8

I  do appreciate it very much.

Brooce, WLP

P.S. Because of computer problems,

I am keeping these messages short.

 

NOISE AND STATIC RADIO

Asymod

Is the Asymod III standalone unit adaptable to the Rangemaster?

http://asymod.am/products/6m4ooha0b3

Sorry.  No.

Sorry.  No.

Druid Hills Radio AM-1710- Dade City, FL. Unlicensed operation authorized by the Part 15 Department of the FCC and our Resident Hobby Agent.  

Wow.. that was an old post

Wow.. that was an old post revived. I've never even heard of such a thing.

Rich Powers Part15, Take 2..

300% AM on Positive Peaks

Just to note that the percentage limit for amplitude modulation on positive-going modulation peaks is limited by the capability/design/adjustment of the modulated r-f stage, as well as those of its modulator and the audio processing used.

Another major factor is listener toleration for the audio distortion products produced by AM broadcast receivers from signals having such highly asymmetric modulation.

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