9/21/2023 0 Comments Homebrew ham radio battery box![]() ![]() That produces distortion and unwanted harmonics and annoyed fellow Hams. This happens when a person through ignorance or malice cranks the power up to 50 or 70 watts or higher in PSK mode. Those of us who have used PSK31 and PSK63 in the past have seen strong signals on the waterfall display blank out all others. The purpose of this paper is to review the PSKMeter kit being sold by KF6VSG. Lesson is: Even with modern NO TUNE radios, we still need to make sure that we have a good match to the antenna system. Lucky for me that the amplifier and radio are well protected. Got the DX!, but I noticed that my SWR was up around 5:1. No luck, I turned on the amplifier that was already set up on 40 meters and made the call with 500 watts out (I was using the dipole). I hit the F11 Key which tuned the radio to the frequency and mode, identified the station and when it was my turn, made the call. My logging software received a DX spot at 7.165 Mhz. I was rag-chewing on 7.245 MHz using a solid state radio at 100 watts. It is on the 160, 75/80, 40 and 30 meter bands where most antennas will only have a 2:1 or less on a portion of the band. On the bands above 20 meters most antennas, once set to the either the SSB sub-band or CW sub-band need no other tuning. But we still find that we need to watch the SWR on these new radios. Now most radios are looking for a matched 50 ohm load with NO final tuning. Most of these radios would load between 50 ohms to 75 ohm antennas. You dipped the plate current and increased the load (the circuit in the radio was a pi network and you had two variable capacitors and an inductor in the output tuning circuit (just like your antenna tuner), the coil was taped for each band covered but the plate and load capacitors needed to be adjusted for each frequency within the band. In the 1970s you still had narrow band tube finals, so you had to learn to tune the transmitter to your antenna. More modern HF radios are now Transceivers (Receiver, Transmitter, switching circuits all included). Go back to the 1960s and you had a receiver, transmitter, maybe an R/T antenna switch that also muted the receiver, trans-match (antenna tuner), SWR bridge, and on and on. In the past you had a separate box for each function. The good news is that with newer radios it gets very easy compared to the goo ole days. Transceiver - By: Paul R.Setting up your station can be a bit of a pain. Solderless Prototyping System & Homebrew Pages K1EL's keyer based on a PIC microcomputer ICīlanker - Line-Synchronous - From ka7oeiĪnd Patrick's Home Brew Page - FM RX, Variable Power Supply, LC Meter, ![]() (Note: original site is gone, link goes to page archive) Note: original site is down, link goes to archived page. Wireless Protocol Analyzer, CTP Descramblers, Online RF Calculator, Six Meter Duplexer, Two Meter Intermod Killer and more. Including Analysis, Media, Practical, Schematic, Simulation Transmitters, Antennas, Receivers, Lots More Stuff that should be easy to find, but isn'tīay Professional Packet Radio - Loaded With GHz projects and much more. ![]() ![]() by Alan Winstanley Via UK's Everyday Practical Electronics MagazineĬharger NiCad/NiMH - Deluxe Project - Via Peter Hayle Homebrew Six-Meter Linear Amplifier - From W8ZRĪmplifier Design App Notes - From Communication Concepts, Inc.ĪC-1 - With a 6V6. Home Brew Amp Project By Randy Adams - NT8N VK2TIP Ian Purdie's radio design - WOW - Ya Gotta See This One SM6LKM - Optimist-80 - QRPp DSB transceiver for the 80 meter band (1 Watt Output, full QSK on CW - From Markus Hansen, VE7CA Homebrew SSB Transceiver for 60 Meters By Paul HF High Performance Tranceiver (HBR2000) - CW/SSB 160 to 10 meters, 6 watts SETS TO SIDEBAND - Free On-Line - A Guide to Building an Radio Receiver Projects You Can Build Buy the Book Today! Construction Techniques, Component ID, Soldering, etc.īuild Your Own Intelligent Amateur Radio Transceiver by Randy Lee Henderson Buy the Book Today! ![]()
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