A few days ago I downloaded a new program from SDRPlay’s website that allows their inexpensive receivers to act as spectrum analyzers. The program was written by Steve Andrew and is available for download here. Soon after it was made available, I downloaded it and, along with my RSPDuo, used it to look at the fundamental and 2nd harmonic of my Elecraft KX2 on 80 meters. The resulting
I’m working on a new QRP transmitter based on the 74HCT240 octal buffer, the circuit has been described on many places, even in ARRLs books.
Read the Original Article https://forums.qrz.com/index.php?threads/74hct240-transmitter.614973/
By virtue of how they present information, SDR receivers can also function as spectrum analyzers. Receivers from SDRplay and Airspy blur the line between receiver and test equipment in a way that is beneficial to hams who don’t have thousands of $$$ to spend on dedicated equipment. SDRplay will soon be releasing a dedicated spectrum analysis program for use with their receivers. But no need For the full article http://ae5x.blogspot.com/2018/05/video-measuring-antenna-return-loss.html
This is embarrassing to ask, but I need help with some transmitter coils. (I guess even after 41 years in the hobby, I’m not too old to need an Elmer). I have a homebuilt 6AG7 – 807 CW rig on 80m and 40m that uses plug-in coils for the oscillator and PA tank. The rig is based on an article in a book which gave the 80/40 coil specs, so I just wound what they suggested and tweaked them as necessary. I just acquired a nice handful of FT-243 crystals for 30 meters
Technical Reference/Raspberry Pi
Configure a TNC-Pi for a Raspberry Pi.
The TNC-PI can be used with applications that use the Linux ax.25 stack, or applications that expect to see a KISS TNC on a serial port.
Technical Reference/Power Meter
A really simple project to make a power meter measuring RF output powers from a few mW up to half a watt. A DIY amateur radio project for QRP enthusiasts
Technical Reference/Spectrum Analyzers
An inexpensive spectrum analyzer for the radio amateur, with a respectable performance and a quite good dynamic range. Schematic and basic information on how spectrum analyzers works.
Can’t set the bias on ft-101ee in LSB mox on no bias reading know its should be 60ma but bias pot has no affect. Any ideas to start checking.
Article showing how I’ve made a mains filter to reduce EMC in the electricity supplying my shack. I’ve used a type 31 Fair-Rite ferrite core and the video shows how this performs on 160m through to 40m.
An online J-Pole antenna calculator that need just to input the frequency and calculates in inch size of each element
I am having problems with the Bias Regulator circuit on my TS-930S PA Board, that is driving me nuts !
It uses an LM723. I thought I would start a new thread here, in case people who can advise haven’t seen my other thread.
I have described the ongoing problems here:
Hope somebody can help !