That PA mod is awesome. I was considering knocking down the power out of the exciter to 20 mW by increasing the value of a couple resistors, and then feeding it into a 40 Watt M100 PA. From there I have the ability to vary the output power from 5-40 watts (ish).
Jesse On 8/22/07, Kevin Custer <[EMAIL PROTECTED]> wrote: > > Jesse, > > You can put a toggle switch on the B+ line going to the Audio PA, this > will cut several hundred mA of current draw from the Class AB audio section, > and allow it to be connected/turned on when service is required. > > Since you are working on a VHF unit, you can review the mods on this site > where I took a 110 watt PA, hack-sawed it in half, and made a 5 to 12 watt > PA that is very power efficient: > http://www.kuggie.com/ahra/hmftinfo.html > > I've also been successful in doing the same with only one transistor (the > controlled stage) and created a .5 to 2 watt PA. > > The exciter shouldn't be drawing current when not transmitting, because > most of it is switched power, and the rest is Class C. > > Hope this helps... > Kevin Custer > > Jesse Lloyd wrote: > > I've been looking through the manuals, and from what I can see is that if > use discriminator audio, I should be able to remove (or manually switch when > servicing) a lot of audio amp circuitry. Also I was going to use a 9.6Vreg > and run the whole thing from a +13.8 V battery supply. > > The exciter circuit, what's every ones thoughts of turning the whole thing > off except when the squelch breaks, then leave it for say 1 min after the > squelch closes. Or is that part totally unnecessary and turning it on and > off via squelch is ok? > > With these mods I should be able to get a standby current of 150mA or so. > > Jesse > > > > On 8/21/07, Jesse Lloyd <[EMAIL PROTECTED]> wrote: > > > > Hey all, > > > > > > Has anyone here ever heard of, or has done, a low current mod on a VHF > > micor repeater so it can be used on a solar site? I plan to use an external > > Linkcom RLC1 controller, so I should be able to remove quite a few power > > hungry stages. The only thing that I have to figure out is a RF PA for it, > > I would like it to put out 5-10 watts. > > >
