HAM SIGNAL

Thoughts,observations,experiments, and ramblings in Amateur Radio by N1DAY and KC4SIT.

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The 50' coax rule has been eliminated. Click above button for updated rules.

Toroid transformers and 630M

David Day

05 Aug, 2017

MORE TO READ

2200M Amplification and Switching System

02/21/2019

2200M provides unique challenges for ham radio operators. Previously I posted a discussion on how I utilized a QRP Labs Ultimate 3S transmitter and Hafler P1500 and P3000 amplifiers to transmit a 0.4 - 0.8 watt EIRP WSPR signal. I was using a Wellbrook active loop antenna for receiving 2200M WSPR signals at 136 kHz, and that setup worked quite well. However, the U3S limited me to WSPR, JT9 and similar digital mode signals in beacon mode only. As interest in the band grows, I wanted to have
SSTV Presentation by KC4SIT and N1DAY

02/11/2019

Ernie and I are having a lot of fun doing our new SSTV presentation to a variety of local radio clubs. As a number of people have been asking for the slides, here they are. Feel free to use them as you wish. SSTV SoftwareFinal.pdf 73 N1DAY
Details and power transfer

02/04/2019

I had a conversation with a ham last week who spent his career studying ways to improve RF power transfer. It was pretty interesting listening to him talk about all of the problems his team encountered at GE and some of the solutions they came up with. My take away from the conversation was that each little detail matters because the change in one detail can impact everything down the line as RF travels from transmitter down a piece of coax, through a matching unit, up a coil, and out onto an