Another approach - as I have a number of crystals at the low end of 3.5
MHz and TTL devices in the junk box I built
a 7400 oscillator feeding a 7490 decade counter wired to divide
by 7. Although the mark/space ratio of the 7490 output is far from
ideal I was surprised at how easy it was to get a clean
looking 500kHz sine wave with a very simple filter.
Peter, G3JFS
In a message dated 22/05/2007 10:03:24 Greenwich Standard Time,
g3kev.ham@virgin.net writes:
It is so easy to get on 500.
RE-Easy Start
Xtal osc 5 mhz/div by 10/fet driver chip and fet
pa in class E.
A couple of hrs to build from the junk box.
The psu can be the common 13.8v at a couple of
amps max.
Keep it simple.
G3KEV
----- Original Message -----
Sent: Monday, May 21, 2007 2:58
PM
Subject: LF: 500kHz
Hi Vic,
Re. Linear Amp, have a look at design by SM0VPO
(Ten Watt Linear Amplifier )
just Google, should find it.
I use his
basic design just put a few more turns on inductors.
73 Hope see you on
500.
Laurie G3AQC.
