IC-7pro II IF output for IF panadapter – t Warning: This modification might damage your radio, void the warranty, andor cause. The idea of providing IC-7pro II transceiver comes from italian ham forum. ICOM 7Pro II and Pro III Output Power Adjustment If your Icom 756. So it's understandable that things were primitive.If your Icom 7Por Pis putting out less than the 1watts specification on HF on cw, you can increase. In the thirties, electronics was big and expensive, and many hobbyists had little or no money. Thanks to N0WVA, W2UW, VU2ESE, HI8P, K4MQG, The G-QRP club and their inspirational journal SPRAT, the RBN and the DX Summit. There is some virtue in using just two transistors instead of 35 billion. But there is a beauty and a challenge in simplicity.
And I wouldn't want to have to use a rig this simple every day. And in the end I had to ask - via the DX Summit Spotting cluster - for someone to listen for me. I'm sure that thing can produce some fascinating results, but can anyone really understand it, or feel that they really BUILT something that has that kind of chip at its center? On the other hand, I did rely on a lot of modern digi technology in this project: The Reverse Beacon Network reported back that my unanswered CQs were in fact getting out (one as far as Kansas to K9PA). I recently read on Hack-a-Day of a new FPGA chip that has on it 35 BILLION transistors. The circuit idea from the Autumn 2001 SPRAT. Lots of soul in this new machine: The variometer from Pericles. Instead of the audio transformer and Radio Shack headphones, I just used some old DLR-1 WWII Headphones. I also used an insulating shaft on the smaller cap - the connector for this one is from an old 1930s era regen that I picked up at the Kempton Part rally in London.
On the right you see a smaller cap with just one vane - this is my fine tuning control - with the smaller cap at mid range, I would just set the big capacitor to put the receiver at 7040 - with the smaller cap I could tune +/- 12 kc. Note the long shaft with the insulating connector - this is to reduce the hand capacity effect. The big variable cap is from the junk box - I think it may be from a Johnson Viking transmitter. In the picture you can look down the tube of the variometer that Pericles HI8P gave me many years ago. Also, the green diode dims a bit when you are at the right amount of regeneration. This one does not squeal when you go into excessive regeneration (when you think about it, regens should NOT squeal at audio frequencies - but most do). The green diode in the source circuit is the key.
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