test in may
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Antennas : Feed Lines : Choke
- RF Choke with Bifilar Windings
- This article presents an RF Choke featuring an 11-bifilar turn winding of #14 house wire on a Fair-rite FT240-31 toroid. The choke is enclosed in a 3D-printed case from Thingiverse, though this may pose thermal concerns at higher power levels. With SWR concerns up to 30MHz, the author plans to employ two series chokes at the rig input for improved performance. This choke offers versatility for portable use, with potential mismatch resolution using an antenna tuner. Further testing is anticipated upon the arrival of new cables.
[ Hits: 85 | Votes: 0 | Rating: 0 ]
- MA QSO Party
- The contest takes place the first full weekend of May (from 1800Z on Saturday May 5 to 0400Z Sunday May 6, and from 1100Z to 2100Z Sunday May 6). A total of 20 hours contesting!
[ Hits: 384 | Votes: 1 | Rating: 10 ]
- 7QP - The 7th Call Area QSO Party
- 7QP is an amateur radio contest, held annually on the first Saturday in May
[ Hits: 206 | Votes: 0 | Rating: 0 ]
- S50U Danilo
- You may find here some stuff concerning contesting and DX-ing.
[ Hits: 474 | Votes: 2 | Rating: 10 ]
- Antennas for QRP Operation
- Antennas for low-power operation resemble those for 100W use. Minor adjustments, like capacitor voltage ratings, may apply, but basic principles persist. Portable antennas, notably Backpack Antennas for weight-conscious setups, hold relevance beyond QRP. While some antennas function acceptably at higher power, efficiency issues arise at QRP levels. Testing antennas at 100W exposes weaknesses, particularly in tuners, crucial for efficient QRP operation.
[ Hits: 58 | Votes: 0 | Rating: 0 ]
- Calibrating the MFJ-259B Antenna Analyzer
- This calibration procedure is the correct procedure for later MFJ-259B's. Disregard any other information. Since MFJ-259B software has been changed under the same model number, you may find some final performance test steps not valid. These steps will involve parameters that do not appear on the display.
[ Hits: 634 | Votes: 4 | Rating: 1.25 ]
- FT-817 internal battery power Fix
- If your FT-817 has stopped powering up from the internal battery but works from external power, then maybe the internal battery fuse has blown.
There is a small PCB mounted fuse to protect the battery and radio. This fuse can blow, if it does your radio will not work from battery power.
This page will describe how to test the fuse and describe how to make a repair.
[ Hits: 52 | Votes: 0 | Rating: 0 ]
- Cab-converter
- A freeware apple Macintosh-based program that helps amateur radio contesters by converting a log from a radio contest into the Cabrillo file format which may be submitted to the contest sponsor.
[ Hits: 1690 | Votes: 3 | Rating: 7 ]
- Soundmodem UZ7HO
- Soundmodem is a free software defined dual-port Packet-Radio TNC that implement a soundcard as a modem and supports AX.25 protocol. Soundmodem has been tested on Windows XP, Vista, 7, 8, 10 and has proved stable in operation. The Soundmodem may be used to build EMCOMM, APRS, BBS, Node station, for satellites
[ Hits: 597 | Votes: 1 | Rating: 1 ]
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