cobra 25

The 15 meters half sloper - Article on an easy to build antenna for the 15-meter amateur band

40 Meter Bow Tie Antenna - Looking for a 40 meter antenna with good gain and take-off angle that fits in a little over 60 of horizontal space at a height of 25? This antenna is for you.

Vertical Antenna for 15 Meters - Building a vertical antenna for 15 meters band

Random Wires revisited - Article on random wire antennas by KH6JRM

ZK3N Tokelau - Official Web Site - ZK3N Tokelau Islands (IOTA OC-048).ZK3N operation period April 25th to May 8th 2013.

DX8DX - DX8DX Taganak Island (OC-225), Bongao Island (OC-174) & Tawi Tawi Island (OC-174) April 2013

9H25Y Malta  ^new - 9H25Y - 9H Malta 2013 May 20 - 2013 Jun 4

Low-frequency radio time signals - Several national physics laboratories operate radio transmitters that broadcast a time code signal.

HF Amp Project  ^new - This is the HF Packer amplifier project. KG9E was able to build this amp and put it on the air in about 25 hours.

VHF 200W Amplifier project - 2m 200 Watt linear using a 4CX250B

6m 200 Watt linear using a 4CX250B  ^new - This 50 MHz RF Amplifier uses a 4CX250b forced air cooled tetrode and produces 250 W for a drive level of approximately 3 W.

2m 400 Watt linear using two 4CX250B  ^new - This is the classic push-pull 2m linear amplifier featured in the various RSGB handbooks, 3 W input, can produce 500W of linear pep

2m 200 Watt linear using a 4CX250B  ^new - This VHF RF linear uses a 4CX250b forced air cooled tetrode and produces 250 W output for a drive level of approximately 3 W

PL-259 to CATV Cable - Adapting PL-259 Coax Connectors to CATV Hard Line Coax Cable