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ROCKMITE - ANTENNA DIPPER - ANTENNA TUNER - KEYER AND PADDLES
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RockMite for 20m
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| This is my RockMite. A very nice little
rig available as a kit. At the photos you can see my additional board
which houses an 700Hz filter and an audio amplifier with high frequency
cutoff(>1000Hz). I have also put a two color led which shows in
which of the two frequencies of the RockMite I am operating. You can
also see that I am using two 14.060 MHz crystals as a receiver filter
to cutdown more off-frequency input. |
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Antenna Dipper
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This is my Antenna dipper. It's a combination of two
designs I have found on the net. It's an antenna dipper which shows
SWR (with a led) at a given frequency. The design is from KD1JV.
I have also put a QRP frequency counter with only one 7-segment led
display. The design is from PA2OHH.
The four switches and trimmers are for selecting the band to operate.
The final calibration is done with the tune trimmer. When your antenna
resonates the SWR led will go out, that's your antenna's resonant
frequency. I have used it on antennas and also on coaxial cables to
find their true lambda/2 dimensions. |
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Antenna Tuner
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This my QRP antenna tuner. I bought it as a kit from the American
QRP club. It's a very low priced kit and it handles up to
10 watts of power, but the nominal rating is 5 watts. It is designed
for balanced lines but with a simple mod it can tune coaxial feedlines
too. It can handle high SWR with no problems. It has a little
drawback, it cannot tune effectively when the SWR are low, like
1.5:1, but then who needs it.
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Keyer and paddles
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 This
is my keyer and paddles I have build it to learn how to operate
iambic CW.
I had some extra keyer chips for my RockMite and I have constructed
this device which works really well. The paddles are made from pieces
of PCB soldered together and etched at the fingertips and contacts.
I have found this from the New
Jersey QRP club.
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For any additional information about
these projects don't hesitate to contact me. Details are on the Contact
page.
© SV1JSB Amateur Radio Operator
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