On 25/07/2013 15:56, John Randall
wrote:
?
It did
arrive as well,? in what looked like a margarine tub...hi.
Good idea I must add. Now just clearing some space on
which to start assembling it. I opted for the 80m/160m
LPF, as this kit will replace my HF rig which is currently
an IF on 80m for for the G3XBM 475Khz transverter kit.
Getting it all in a metal box within the existing
enclosure should be easy.
I will also change the 20Mhz xtal for a more stable
oscillator.
John
?
Digitally
signed mail - M0ELS
From:
Philip
To:
QRPLabs@...
Sent:
Thursday, 25 July 2013, 15:11
Subject:
[QRPLabs] Re: Nose to the windows
?
Slippery slope John....
Now you'r addicted and there's no known cure
..
I blame Hans :)
Philip G4JVF
--- In
QRPLabs@...,
"m0els"
wrote:
>
> As the postman approaches down the
road, I h. One had is holing the soldering
iron and the other is pecking away at the
keyboard.
>
>
> 73
> John
>
John
I'm playing with using a U2 to drive a30 watt class E PA directly at
475KHz and using WSPR. The PA driver circuit needs a 0/5V square
wave input signal so I've removed Q1 and Q2 from the U2? and am
feeding the pin 7 output from the DDS module through a 4066 switch.
The control signal for the 4066 is taken from pin 19 of the
ATmega168 since I want the PA driver signal to be at 0V during the
WSPR off period. If I take the PA driver signal from Q2 drain of the
U2 kit, it's 'high' when I want it low!
--
73
Barry, G8AGN
