Category Archives: Blog

Yaesu FT-501DX Low Pass Filter

I purchased the FT-501DX LPF along with a number of other items. It belonged to a very good friend, sadly it was part of his SK sale! As my interests are very much VHF upwards, along with the odd session … Continue reading

Posted in Blog, IC-7300, IC-735 | Leave a comment

AD8317 + Arduino RF Power Meter # 2

I built an AD8317 power meter a couple years ago. The AD8317 is specified for operation up to 8 GHz, but it provides useful measurement accuracy over a reduced dynamic range of up to 10 GHz. With suitable software and … Continue reading

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QO-100 Experiments – New QRP Transmit Up-converter

I started out on QO-100 using a small home made transmit up-converter built around a number of modules available from eBay. Apart from some failed mixer boards this setup worked well for a period of 18 months or so. I … Continue reading

Posted in ADF4351, Blog, GHz_Bands, QO-100, Satellites | Leave a comment

K3 Panadapter using the NooElec Upconverter + SDR + SDR-Console

My K3/10 has been used primarily with transverters for the VHF and higher bands (it has seen hardly any real use on the HF bands). A FCDPP connected via a splitter to the IF output of the 2m transverter, plus … Continue reading

Posted in Blog, Elecraft K3, SDR | Leave a comment

Yaesu G-5500 Elevation Rotator Repair

In a previous post I described how my G-5500 rotator had failed and would no longer elevate my antennas. Based on what I was seeing at the time and a quick check with a DVM I believed that one of … Continue reading

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QO-100 Experiments – New Down-converter

Probably like most people starting out with QO-100 operation I initially used the Goonhilly QO-100 WebSDR to listen to the satellite down-link. This inspired me to experiment with an LNB, a 65cm offset dish, and a NooElec SDR module with … Continue reading

Posted in 3cms, ADF4351, Anglian TVTR, Arduino, Blog, EME, GHz_Bands, QO-100, Satellites | Leave a comment

QO-100 Experiments – ADF4351 SynthShield

I’ve recently used a number of ADF4351 modules in various projects. The last two modules have been used to provide a single fixed frequency output. An Arduino Nano running the F1CJN single frequency sketch is used to control the ADF4351. … Continue reading

Posted in 3cms, ADF4351, Arduino, Blog, GHz_Bands, QO-100, Satellites | Leave a comment

Yaesu G-5500 Fault – No 2

I’ve been using a Yaesu G-5500 Azimuth and Elevation rotator for the last seven years. It has been used to rotate various Yagi antennas, initially a single 9 element DK7ZB  for 144Mhz, that was replaced with 2×8 element 144Mhz Yagi … Continue reading

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QO-100 Experiments – LNB Modifications

I have been using a Goobay 67269 LNB with a small Horn antenna on 10368MHz for a while to monitor beacons via rain-scatter. This was a fairly basic setup, the Chaparral horn had been cut-off and the LNB mated to … Continue reading

Posted in 3cms, Blog, GHz_Bands, QO-100, Satellites, SDR | Leave a comment

Enhanced USB-to-Serial PTT Interface

Many of the modern transceivers today support direct USB connectivity to your shack PC. This USB connection typically enables 2-way audio and CAT control allowing more or less full control of the transceiver, including PTT keying. Where CAT control for … Continue reading

Posted in 23cms, 3cms, 70cms, Anglian TVTR, Blog, EME, GHz_Bands, QO-100, Satellites | Leave a comment