RF Circuits

Here's the collection of parts needed to build my transmitter (the power supply is separate). I'll mount the male 8 pin plug on the ...

Another feature missing from most pre-WWII transmitters is some sort of spotting capability. Two reasons drive the need for spotting capabil...

Here's another thought on layout ... move C2, the final plate tuning cap, from on top of to under the chassis. This frees up space top s...

Someone asked me about modifying a vintage design in the name of safety. Sounds like a good idea to me. I already modify vintage receiver pr...

As I search for parts, the topic of subbing parts has come up, particularly for C1 and C2. Miniture 140pf dual section variables are called ...

I'm to the point of starting to layout my 815 transmitter. Here are a couple of figures from the 1943 ARRL handbook describing this tran...

According to the 1942 ARRL Handbook the 815 requires less then 2/10 of a watt of drive. A 6L6 is rated for much more than that. The 6V6 has...