[ARC5] Q about modulation transformer.

[Kenneth G. Gordon]

On 9 Oct 2015 at 9:06, Leslie Smith wrote:

> I'm writing about eBay item #351537579927.
> 
> You can see photos of this item - attached.
> It is listed as part of ART-13.  I presume this is a Collins
> Transmitter.  We rarely see such an item, here in Australia, although
> one fellow in Sydney has one.

That is the audio pre-amp and sidetone oscillator. Its primary input is the 
microphone.

The modulator in the ART-13 is driven by that module, and consists of a pair 
of 811s.

> I'm looking for a modulator I can "mate" with an ATA or ARC T-19
> transmitter.

Well, the output level of that pre-amp is only couple of watts, as far as I 
know, so unless you wanted to use screen or grid modulation, it probably 
won't do.

I CAN suggest that you try controlled-carrier screen modulation with your 
transmitters. The audio power required is very low, and it "almost" sounds 
like SSB to an SSB person.

For my horribly hacked transmitters, I intend to use controlled-carrier 
modulation.

Ken W7EKB