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N2PK VNA Transverter options
The N2PK VNA frequency range can be extended by using transverters. While the N2PK VNA covers the entire 0.05 to 60 MHz, additional frequencies are covered only on specific bands. Paul, N2PK and Ivan,...
View ArticleFlight Simulator Update
Lately, I've been working on a compete update of my flight simulator. The new configuration is a setup of 4 machines. The server machine is an IBM Intellistation Z-pro (dual CPU)/ 2 x Xeon 3.8 GHz(2MB...
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"Say Hello to my little friend!"
Update: If you are looking to buy an Antenna Launcher for Field Day, please check this post.Tony Montana's famous words as the answer to the question: How do you get an antenna rope over a 100+ ft...
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Digital Scope for the antenna launcher
Sometimes great ideas shine, just because of their simplicity and I think I had one the other day. (You can tell that I am modest person :-). I am claiming to have the most sophisticated aiming system...
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Antenna Launcher Digital Scope Part 2
These are the final touches to the Digital Scope System and the Antenna Launcher.I made a hood out of a sheet soft closed-cell foam and attached it to the aluminum frame of the scope with Velcro for...
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Wire Antenna Tension Breaker
Wire Antenna's enemy #1 is the wind (Corrosion being #2, Lightning is a topic of entirely different discussion).In high winds, tall trees sway a lot - the taller the tree is - the bigger is the...
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Awl modification for Leatherman Wave
I had my original Leatherman PST (Pocket Survival Tool) for many years and when I decided to upgrade to Leatherman Wave, I was a bit disappointed to find out that they have omitted a very useful tool...
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Experimental Parabolic Microphone
I've always wondered how well a parabolic mic works. Here is my experimental setup for testing such DIY parabolic microphone. It is a great weekend project and will let me experiment with high-gain /...
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My 2nd Generation N2PK VNA
I am just about done with my second generation N2PK VNA. The first one I've built is mainly for portable / field use, while this larger unit is for my work bench.Main differences over my first...
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Reflection Bridge with Type-N connectors
I always try to avoid using "between-series" adapters - there are so many out there with questionable quality. Sometimes these adapters are just the "necessary evil". In an attempt to reduce the need...
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Crystal Test Fixture
Jack Smith, K8ZOA posted an interesting paper on "Measurement approaches of Crystal Motional Parameters" and designed a test fixture (based on the "classic" IEC 444 pub. fixture) to aid such...
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Yet another set of VNA calibration standards
This time - Type-N female. One of the most critical components in DIY calibration standard is the connector used to build it. The market is flooded with all kinds of connectors but most of them are of...
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Pneumatic Antenna Launchers for sale
UPDATE Sep 2013: Pictures of the new style BDAS-2 Launcher.Complete BDAS-2 kit - this is what you'll receive if you order one.The User-Manual is available for download (check the link in this post)The...
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SteppIR BigIR - broken element drive shaft
After 5 years of moderate use, it was time to perform a basic maintenance of my BigIR Mrk III and I also wanted to take a look inside the Element Housing Unit (EHU). I had a spare EHU gasket at hand -...
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Customizing Zero Tolerance 0551 / 0550
Sometimes, having a limited edition knife just does not "cut it" :-) I have this urge to improve on commercial products and customize them to my own needs and vision.Zero Tolerance 551 indeed is a fine...
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DIY Glow In The Dark Fob
After some experimentation with Glow-in-the-Dark pigment powder and creating the "fireworm", I came up with an application for it - an inexpensive but IMHO pretty cool solution for a GITD fob. This fob...
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For sale - N2PK Vector Network Analyzer
UPDATE: SOLD! Thanks Bob! This unit has found a new home at Tufts University, but most importantly, it will be used for scientific research - I just couldn't wish for a better new owner.If you are...
View ArticleIt's a girl!
One more of these, very rare and very special life-turning days! Couldn't be happier to say: Today, Dec 29 at 1:10am Eastern Time, my second harmonic - Alexandra (Sasha) Stoev was born - 9 lb 1 oz and...
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Spektrum AR7200BX antenna repair / antenna extension
Here is a tip for the RC heli crowd on how to repair or extend the antennas of the popular AR7200BX flybarless controller.AR7200BX is pretty much a Microbeast BeastX flybarless controller bundled with...
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Align 450 DFC - Blade grip control link mod
One disadvantage of the DFC (Direct Flight Control) Rotor Head is that it puts the blade grip control links under a lot of strain and they eventually can fail causing a crash. Align tried to solve the...
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