View Single Post
Old 5th Apr 2020, 3:39 pm   #3
Andrew B
Heptode
 
Andrew B's Avatar
 
Join Date: May 2015
Location: Bradford, West Yorkshire, UK.
Posts: 512
Default Re: A cheap VHF radio, worth the effort?

Thanks Sirius, it does have a "107M5" crystal filter, so I assume it's dual conversion 10.7/455. Everything worth seeing is gooped in wax, sponge rubber in the coils (and gooped in wax). I can easily attach an external antenna as the original rubber duck unscrews and has an M6 thread. I can't identify the RF amp or OSC transistors but probably common NPN silicon . It just seems that with a nice Toshiba IF amp/det chip the radio MIGHT be capable of decent 2M FM, but will probably have little selectivity, so I could listen to all of the 2M band at the same time.
__________________
worried about the electrons entering the circuit and the smoke leaving

Andrew
Andrew B is offline