An easy to build UHF TV modulator

This analogue audio/video modulator operates in the UHF TV band. Apart from the different type of UHF oscillator, it's schematic, operation and alignment is identical to my other TV modulator, but this one has been made without any PCB, so it can be reproduced easily. Therefore, for alignment, use the instructions provided in that TV modulator page.

+12v

6MHz

5.5MHz

4.5MHz

4.7uF
16v C1 82pF 100pF 180pF

78L08 C2 220pF 270pF 390pF

1k C3 330pF 390pF 680pF

100uF
16v 100nF 0.5-8
pF 2turns
3mm
diam. 0.85mm
silver
plated 220k audio
input

4.7k 0.85mm
pitch 100nF

33k

1.5nF 3.3k

56nF

BFR91A 3.3pF 47k

MV209 BC557C

100uF
16v 100nF 4.7k 100uF
16v BF494 10k

470R 10pF

1k C2 47k 10uH 39k 470k

BF494 100pF

3.9k 6.8k C3 C1 7-80pF

10k 1nF

3.3k

6.8pF

3.9k video
input

10k

2turns
3mm
diam. 0.5-8
pF 1N4148

0.85mm
silver
plated

RF
output 0.85mm
pitch

tap at
0.5
turns

from
GND