Hello Richard,
I also collect CT-101s and the whole range of Panasonic & other brands micro-TVs.
Back in 2004, after much searching about low power TV transmitters, i discovered Greek company Aspisys and their 80mW synthesized TV transmitters. I purchased PAL B/G and NTSC versions.
The original product was unpackaged, just a PCB.
http://www.aspisys.com/tvpll.htm
Two years ago, they brought out a newer model capable of all major world TV standards in a single model with 100mW of RF power.
All in all, i have 8 transmitters (a mix of the new & old versions), future-proofing myself against the blackout of analogue TV.
My two main transmitters (PAL & NTSC) operate 15 hours/day with no reliability problem whatsoever since 2004.
The units produce quasi-broadcast quality pictures, however they don't use vestigial sideband filtering, so can't qualify as true "Broadcast".
The signal is good & strong and allows "off whip" TV reception from anywhere in the house (give or take a few blind spots).
Personally, i repackage the units in an aluminum box. This gives adequate cooling to the +5 and +12VDC integrated regulators which run rather hot, not being heatsinked in the original design, and of course better RF shielding which the plastic case does not provide.
You can Email for info here:
info@aspisys.com
sales@aspisys.com
Aspisys is run by a very knowledgeable engineer with great competence in the RF and video fields. You can communicate easily in English.
Pictures:
#1 shows the original 2004 design (PLL TV Sender)
#2 shows the Aspysis RF test gear, serious stuff!
#3, 4 show my repackaging of the original transmitter
#5 shows the current version of the TV transmitter (UTV-100TX)
*disclaimer: i have no interest ties with Aspisys.
Best Regards
jhalphen
Paris/France