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8 meter band
Lately there is quite a lot of attention for the 8 m band (40 MHz). Transmissions are done from Ireland, UK and Denmark for example.This band could be interesting to explore for various reasons:The...
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HF65
JostyKit was the name of a Danish manufacturer that sold nice Do-It-Yourself kits. One of them was the HF65. In fact a free running oscillator that operated in the FM broadcast band (and below and...
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Logaritmic Power Detector
From AliExpress I ordered this nice PCB with a logaritmic power detector circuit onboard. The electronics is designed around an AD8307 integrated circuit. The detector should operate in the range 1 -...
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Citizen Band QSL card
Just found one of my old CB QSL cards. This one is from 1978. At the time I used a 23 channel CB transceiver "North Star". Memories..channel 14, 27.125 MHz AM .. and 4 Watt RF output into a DV27...
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BC860XLT VHF/UHF scanner
Last weekend I re-discovered the Uniden Bearcat BC860XLT VHF/UHF scanner. I did not use it for over 10 years. It is a remarkable receiver covering the frequency range 29 – 956 MHz. It contains 100...
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The Stele of Hatiay
Lately I visited the National Museum of Antiquities (‘Rijksmuseum van Oudheden’) in Leiden. One of the many fascinating objects that amazed me was ‘The Stele of Hatiay’. It shows general Hatiay...
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Start of the Es season
Yesterday I powered up my 4 m equipment. To my surprise I saw EA and 9H stations. No dx QSO's yet. I did make some local 70 MHz QSO's though. Looks like the Es season is ready to start.
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HB9 on 160 m
For a change, last week I was active on 160 m. With my end-fed longwire antenna - in the evening hours - I managed to work a couple of stations. One of them was HB9EFK. This was my first with...
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Sun
Yesterday evening I witnessed the sunset from my backyard garden.I realized that it is amazing that a star at a distance of 150 million kilometers from us affects the propagation of radio signals on...
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SDR receiver exploration
Great fun with SDR Receiver MSI2500 in combination with SDRuno software. I am exploring the possibilities of this nice toy.The SDR receiver (frequency range 30 - 1000 MHz) has 5 antenna inputs each...
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DvdR 2023
Last Saturday, Oct. 28, I was part of the ‘NL-post’ team at the DvdR (Day of the Radio Amateur) in Zwolle, IJsselhallen. I was there with Thieu, NL-199, PA0M and Gerard, PA2G. It was good to speak to...
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Solar flare hitting Earth
A powerful M9.8-class solar flare erupted from the sun (AR3500) on Wednesday (Nov. 29) at 2:50 p.m. EST (1950 GMT), hurling a super-hot plasma eruption known as a coronal mass ejection (CME) toward...
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Danish eQSL's
Radiofriend Gerard, PA2G, made 2 FT-8 Special Event QSO's with Denmark. The event concerned the inauguration of King Frederik X. I think the eQSL's are quite special.
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Little Medium Wave radio
From a popular supplier of electronic goodies, I purchased a tiny MW/FM radio (not a DIY kit). It does not have a loudspeaker but should be used with headphones. I was interested in the performance of...
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Platform for KT0936M experiments
The little KT0936M receiver IC has surprised me. To find out and explore the possibilties of this chip I made a simple platform.A multiturn potentiometer enables me to select any of the more then 20 FM...
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QRV from Attica
During a recent trip to Greece (Attica, Agia Marina) I was able to use one of the radio repeaters near the capital of Athens. The repeater has callsign SV1B and is located on Mt. Pentelikon. RX...
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Roger's Scrapbook
Some of my projects on this blog are inspired by the radiowork of Roger, G3XBM. I like his transverter designs in particular.I found that Roger collected a lot of his work in his Project Scrapbook...
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First steps in satellite communications
The Satrover QO100 transverter enables you to use the geostationary OQ100 (Es’Hail-2) satellite. I was able to explore this equipment with Gerard PA2G. With the use of an IC-705 and the satellite dish...
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Radio Caroline
Lately I have been experimenting with a KT0936M module on the medium wave. I discovered that Radio Caroline puts a firm signal strength at 648 kHz at my QTH. The music they play is from the 60’s-90’s....
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70 MHz Sporadic E contacts
This week now and then the 4 m band opened because of Es.I made FT8 QSO's with Spain (EA6SX) and Greece (SV2DCD, SV2JAO..) on 70.154 MHzOne QSO has already been confirmed by eQSL:
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Medium Wave LPAM transmitter
I did some experiments with the receiver IC KT0936M lately. I built a simple SW and MW receiver with this chip. To be able to do some experiments with the MW radio I thought it would be a good idea to...
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73 from the past
I found a nice eQSL this morning from Urugay in my inbox. It dates back to 2006. In that time I was quite active with PSK31:
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28 MHz activity
I hooked up my FT450 with longwire antenna to explore the 10 meter band. There is a lot of activity ! A lot of stations on 28.074 MHz FT-8 as well. I made some QSO's. I received a remarkable eQSL card...
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OZ on 160m
I made some nice QSO's on 160m, 1840 kHz, lately. Of course my longwire antenna is much too short for this band, nevertheless I was surprised by the amount of stations I could see in FT8.Jan, OZ1ADL,...
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145 MHz transverter
Currently I am working on a 145 MHz - 50 MHz transverter. I combined various circuits and built it in Manhattan Style. The core is a 96 MHz oscillator that enables me to tx and rx from 144...146 MHz in...
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