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Reviews (5)
Jul 21, 2016
Great toroid, good kit, no instructions
1 of 1 found this helpful This kit includes an Amidon FT-240-K toroid and enough #14 polyamide magnet wire and PTFE to make a balun twice over. The tested permeability of this toroid was spot on its rated initial permeability of 290. This kit is geared specifically towards making the Jerry Sevick (W2FMI) designed HBM200 4:1 balun. This is from his book Transmission Line Transformers Handbook. What Mr. Sevick didn't know about baluns likely wasn't worth knowing, so you can be assured it's a good design. The only thing is, for a kit geared so specifically toward making one particular design, it would be beneficial if the kit actually came with the design. Not including the design seems to be aimed at selling a more expensive version of the kit that includes the entire handbook. It really wouldn't hurt them to include a photocopy of the page, since Amidon owns the copyright to the book. Also, the PTFE included with this kit is slightly thicker than it should be, which makes winding the toroid properly difficult. The PTFE wall thickness seems to be the correct 15mil, it's the inner diameter which appears to be too big, which makes it easy to slip over the wire, but the resultant covered wire is to thick. However the balun produced, if you are careful, tight, and persistent with your winding, is excellent. When tested with an antenna analyzer and a 200 ohm dummy load, the produced 4:1 balun shows an almost flat response across the entire HF spectrum, with a 1.02:1 SWR at 3MHz, and 1.04:1 at 30MHz. Overall the end result is very good.
Sep 14, 2016
Simply excellent
2 of 2 found this helpful When discussions come up in ham radio forums on what was the best HF transceiver ever made, there is a reason why the Drake TR7(a) consistently ranks as the top voted one. It is simply one if the finest radios ever made. It's array of available filters, audio quality, wideband coverage, transmit duty cycle, excellent noise floor, and full passband tuning make it a radio that can compete quite favorably head to head against modern radios.
This transceiver is over engineered in a way that is vanishingly rare. For example, the final amplifier is capable of fully twice the radios rated output, meaning in normal operation they are essentially loafing along. The TR7A (or a TR7 with the optional fan) is capable of 100% transmit duty cycle on CW. It's capable of it in SSB even without the fan.
What makes this all so very remarkable is that this is one of the very first completely solid state HF transceivers ever. It's also a fully open design. A radio you can tinker with, add functionality to, and repair. Something you can't do with today's VLSI DSP rigs. These radios will still be coveted another 35 years from now. This radio is the pride of my shack, and will be my primary HF radio for the foreseeable future.
Aug 16, 2017
Complex and engaging
If you are the kind of person who just wants to blow stuff up, then this is not the game for you. As a naval officer I can say I have never seen a more accurate rendition of anti-submarine and anti-surface warfare than this game presents. It is complex, rich, and engaging. I was introduced to this game by a shipborne air controller instructor at the RCS's Naval Fleet School Atlantic - that should tell you something about it's depth. Unless you are a member of a navy in a combat trade (and for some features even if you are) you will likely have to spend some time with the manual. This is not a bad thing, though, because the manual covers most every aspect of naval warfare and you can take it in in bits and pieces to learn. If you are in the navy this game will help you broaden your scope and learn what the other folks on your ship have been doing all this time. If you aren't in the navy, no other game will give you a better feel for what it is like than this.
One of the best aspects of the game is the multi-player. It is designed so that different players can take on different ships, or different roles on the same ship. Want to operate as a team, one on the sonar, one on the helm, one on the weapons? No problem. Be a real ops team, or play against each other.
Unfortunately it doesn't like Windows 8 or 10. However, there is a third party patch that makes it run and from my experience so far, run well. It's not perfect, but it's very playable. The graphics are reasonable, if dated, which is the bad news. The good news is that any modern hardware should be able to run the game at its highest quality settings.
Highly recommended.