HI ! Hello Luis and Graham, and thanks for your comments.
The limit here seems to be around 0.03 milli Watt (30 micro Watt) ERP. 2
days ago, I received only one report for my Txing all the night !
I was using only my home made TX mixer without
the amplifier stage. Output from the MPF102 : 2 milli Watt. Including the
antenna efficiency : about 30 micro Watt ERP. See on photo the linear
converter.
Antenna is a 75 meters long Inverted L, with base
L tuner. Zantenna = 15 – 610 j. Using oscilloscope, the RF voltage at
the cold side of the tuning coil is only 0.43 Volts RMS !
I hope to copy you soon dear Luis. Best
luck.
73 to all. F6CNI Andy – JN19QB.
Sent: Monday, April 27, 2015 5:21 PM
Subject: RE: LF: Re: New QRPPP test to night on WSPR 2
MF
Vey nice test Andy. Thank you for sharing your
results
I'm also transmitting QRPPP (may be with one more "P") with
just the Ultimate-3 connected to antenna
Have been using a vertical 11m high without coil. But last
week I finally installed a 70m perimeter loop
and managed to get it tuned to 477KHz. On my monitor at 7Km I
have imporved by 10dB with the loop
I'm transmitting WSPR-2 and Opera8. So far have got my first
(and only) WSPR report from about 500Km
at David EA1FAQ. And last night got a few decodes from Iban
EB3FRN
I don´t know which is my ERP. But can be probably well under
1mW ??
Next step is an small 25W PA. But for the moment will keep on
QRPPP
73 de Luis
EA5DOM
Congratulations. QRPPP is certainly fun and a real challenge for the RX
stations.
73s
Roger G3XBM
