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Katsu JA7QIL has built an improved method of tuning up and down the band when operating the ATS-4 – and added paddles to boot.
In his own words (and with Katsu’s kind permission to post here):
For easier ATS-4 operation, I built an ATS-4 Controller with touch paddle as shown below. Though I call it “Controller”, it is nothing but a simple directional tactile switch box. I used an ALPS SKQUAAA010 tactile switch which has 4 contacts in one package – one for each direction.
It is much easier to move around the CW band than with separate up and down tactile swithes.
Here are photos Continue reading 'External controller for ATS-4 de JA7QIL'»
For the past few months I’ve been following along on a few websites devoted to modern construction of early mechanical televisions.
The first TV stations in the US operated just above 2 MHz from NYC and other large metropolitan areas in the 1920′s.
There were a lot of them and very little standardization as yet with WLEX even operating on the 80m ham band, transmitting full-motion video with a bandwidth no wider than a typical phone signal.
As you might expect, hams were involved.
Old radio magazines from that period contained instructions on how to build receivers – more often than not, the receiver was simply a regular audio receiver with additional components added in order to “demodulate” and display the video.
Not real video, but moving pictures nonetheless. Continue reading 'Narrow-band television kit received'»
Almost a year and a half ago I ordered, built and wrote about a new kit – a stand-alond WSPR transmitter from Jay Wilson W5OLF. You can read it here.
Jay has just announced three big changes to this kit: Continue reading 'Changes & additions to W5OLF’s QRP WSPR kit'»
The Xtal Set Society offers a number of kits, aimed mostly at those wanting to experiment with shortwave reception using crystal and simple 1-transistor receivers. Also in the mix are a few pieces of simple test equipment like attenuators and dummy loads.
Their ad in CQ Magazine caught my eye some time ago and I finally got around to checking it out. Continue reading '“CW Scrubber” kit is now “CW Regen Filter” kit'»
It looks like Steve Weber KD1JV will be producing another round of MTR (Mountain-Top Rig) kits (description here) sometime after the New Year.
For the first round of this kit, users simply built their MTR’s into an Altoids tin – this time, Steve is considering having a small housing included Continue reading 'Mountain-Top Rig 2.0 and PFR3 2.0 from KD1JV'»
More of a project than we generally infer from the term “kit” the MST400 is a partial kit for 40- or 80-meter phone with a 5 watt output..
If I weren’t busy with the tower/Yagi project at the moment, I’d almost be tempted to spring for one of these. The “partial” aspect does bother me though – my luck, I’d order the most complete version of the kit available and would then have trouble finding one or two parts.
I wonder how difficult it would be Continue reading 'New QRP SSB transceiver “partial” kit from Australia'»