Hello All,
In a direct e mail to me Steve GW4ALG wrote
-----Original Message-----
Sent: 29 July 2001 08:40
To: Michael Probert
Subject: Your QRP Tests
Hi Mike,
What a most impressive antenna! I believe the distance between
us to be 174 km.
To confirm your reports:
Usual power: 589 (Normally abt 300W out 3.5/4 amp ant current)
40 W: 569
10 W: 5 5/6 9
5 W: 559
1 W: 549
As you will know, QRP is generally taken to be 5 W RF output, or
less. I would guess that your antenna is probably 10 dB up on my
12 m vertical.<<<<<<<<<<<<<
Yes Steve I too was surprised that you were receiving me on the last test.
I don't have any accurate means of measuring power output ( very basic here
only multi meter & inductance meter) But the input was 3V @ 0.5amp so I
guess O/P was close to 1W to the antenna.
I did actually switch the PA off hoping that a few mW might creep through
from the driver, but that was asking too much! It also says a lot for your
RX set up. I could not hear Dave G3YMC nor F6BWO when Tom G3OLB was in qso
with him. I confirm that the Tx ant. here is a coventional doublet with 60m
top up 20m fed with 300ohm ribbon, strapped at feed end. Rx ant. G3LNP loop.
On receive the main antenna usually is far noisier albeit with stronger
signals.
All of which goes to prove what we know already that a good transmitting
antenna does not always work well on receive. Must get round to making
Peter's (G3LDO) loop. It's the thought of soldering all those Litz wire
connections that keeps putting me off!
Many thanks Steve for the most interesting test.
Regards to all
Mike GW4HXO.
|
