Chinese Amp Kits

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radiogareth
Posts: 335
Joined: Wed Jan 06, 2016 9:46 am

Re: Chinese Amp Kits

Post by radiogareth » Tue Oct 22, 2019 2:33 pm

Could you share the changes you made to use it on 4? Mine delivers about 12 watts of DVB on 2M (biased up to the eyeballs!) but on 4, once filtered, only about 8 watts. The second harmonic (71*2) is bigger than the fundamental!!
Gareth G4XAT

GalmOne
Posts: 5
Joined: Fri Oct 18, 2019 4:07 pm

Re: Chinese Amp Kits

Post by GalmOne » Wed Oct 23, 2019 12:48 pm

Yeah, their quality is all over the place. Sometimes you get something that's fine, and sometimes, well, you get something to show in that thread... I haven't built my own ATV set yet, but I've worked with Chinese radio and video equipment for RC planes and it's always a lottery.

M0YDH
Posts: 165
Joined: Sat Dec 31, 2016 5:59 pm

Re: Chinese Amp Kits

Post by M0YDH » Fri Nov 08, 2019 5:27 pm

Dear Jim
Which value of coupling capacitor did you choose please? What other ingenuity did you apply?
A 70.5 MHz amp for the <10 contacts I'll ever make on TV on this band is OK at this price! :roll:
73
David M0YDH

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