http://elecraft.85.s1.nabble.com/Boots-for-the-XG3-tp6514422p6514768.html
... Joe, W4TV
> A few days back I inquired of the list if anyone knew of a small
> post-amp that would prefilter the XG3 square wave and give it about 30
> dB boost. There were no answers. The problem seems to be that most QRP
> or QRPp amps already require a few tenths of a watt input, and the 1 mW
> from the XG3 is just too tiny...
>
> I have been specifically thinking about using the XG3 (in its spare
> time) as a 6 meter beacon. Just hooking it up to a "resonant" antenna is
> not (IMHO) legal, since antennas (think center-fed half wave doublets)
> do not discriminate against ODD harmonics. FCC requires better...see
> §97.307 Emission standards, section (e).
>
> I have been thinking this over, and it looks like the best answer is to
> build around a 20 dB gain block running in to a power module, such as
> the MAR-6 gain block into a M57735 power module. The output from the XG3
> would need to be low-passed before the gain block, since the usual gain
> blocks are quite wide band (e.g. DC-3 GHz, etc.).
>
> HOWEVER, a glance at the manual for the XV series transverters already
> shows a transmit path designed and ready, in the schematic for the XV50.
> Aside from ~dozen SMD caps in the filtering (not needed!) connecting the
> mixer to the SGA7489 gain block, the needed component list is rather
> short, about 26 parts, most of which are mundane. I asked Wayne if
> Elecraft would bag up these parts and sell them to me as a partial kit,
> and his response was more or less positive, but he requested that I poll
> the list to see if there is any other interest:
>
> -----> A partial kit, no enclosure or circuit board, to assemble a 6
> meter post-amp for the XG3 that would produce 1-5 watts.<-----
>
> Note: the SGA7489 gain block is obsolete but the device remains in the
> supply chain.
> Note: the RA30H0608M power module is designed to put out 30 watts in the
> 68-88 MHz range. To drive it to this power level from the XG3 might
> require cascading two gain blocks. A substitute part is the M57735
> mentioned above, designed for 25 watts at 50-54 MHz.
>
> I think that a post amp built "ugly style" around these ideas would fit
> into an Altoids tin. The only hitch is proper heat-sinking of the power
> module. The layout used for the XV50 takes care of the biasing.
>
> *****
>
> So, I am asking the list: "Is there any interest out there amongst XG3
> owners in having Elecraft bag up a partial kit as outlined above?"
>
> *****
>
> This note is also going directly to Eric at Elecraft, who holds the
> reins for manufacturing...
>
> John Ragle -- W1ZI
>
> P.S. The schematics for the XV50 is included in my manuals for my XV144,
> which BTW works wonderfully...
>
>
>
>
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