cobra 75

The flower pot antenna - A portable dual-band antenna working principally on 10 meters but also close to the 30 meter band. It’s compact, light, economical and doesn’t need any radial.

Broadbanding the half-square on 80 meters - N6LF discusses a simple way to broadband the classic half-square antenna to operate in both the CW and SSB DX windows on 80/75 meters.

WB6ZQZ Triple Ratio Balun - This balun matches resonant antennas from 9 to 75 ohms without a tuner and provides RF isolation to keep the current off the transceiver case

Simple HF Baluns for 50/75 ohm coax - Show diagrams, winding methods and tables of some 1:1 and 4:1 baluns for 1.8 - 30 MHz suitable for use up to 200W (400W peak) on systems using 50 or 75 ohm coaxial cable input where SWR should not exceed 1.6:1.

75 Meter Delta Loop Beam - A delta loop project for 75 meers band

160 m Balanced Coaxial Receiving Loop Antenna - KN4LF explanation of the 160 meter balanced coaxial receiving loop antenna, easily adaptable to a 40 and 80 meters band

75 meters mobile antenna - A mobile antenna for the 75 meters band by K0RWU

WWVB Loopstick Antenna - A loop antenna for receiving WWVB based on the Amidon R33-050-0750 Ferrite rod.

The Small Loop Project - AM loop antenna for 75/80 meters band

Hamilton Amateur Radio Club - The Hamilton Amateur Radio Club operates the VE3NCF repeater, 146.760- and 444.075+MHz. It is open for use by all Hams

K6PV Palos Verdes Amateur Radio Club - Founded in June 1975, as the Rancho Palos Verdes Amateur Radio Association, the PVARC is a non-profit organization whose purpose is to further the exchange of information and cooperation among members. Rancho Palos Verdes, California

K6BB Big Bear ham radio club - The club was established in 1975 with the purpose to further the exchange of information and cooperation between members, to promote knowledge, to prepare for service in the community in time of disaster or need for emergency communications,

NI4CE West Central Florida Group, Inc - Founded in 2001 to manage and operate West Central Florida's only regional linked amateur radio repeater system. Currently, the NI4CE Repeater System operates nine repeaters from five sites with more on the way. NI4CE covers all or parts of twelve counties in West Central Florida and provides mobile coverage along the areas I-75 and the I-4 corridors.

N200 835 Amateur Radio Group, Inc. - The Manahawkin Repeater since 1975

Long Island Amateur Radio Club - 575-Long Island Amateur Radio Simplex Club, Operating locally on 147.575 FM Simplex from Grid Square FN-30

W8LBZ Sandusky Radio Experimental League - The Sandusky Radio Experimental League Inc,(SREL), is a club of amateur radio operators in Northern Ohio. SREL sponsors the 53.35, 146.655 and 444.375 repeaters.

North Coast Contesters - NCC was formed in 1989 to further the efforts of contesters interested in the CQWW and ARRL DX contests. The member area of the club is a 175 mile circle that includes major parts of Ohio and Pennsylvania.

3840 Audio Archives Priority listing - 80/75 meter Amateur Radio recordings via various online tuners.

Television History - The First 75 Years, learn about the history of TV-set design, development and marketing.

The Noise Floor - The noise floor: 1750 meter lowfer and medfer resource

Drake Manuals - R-4A, R-4C, TR-4C, SW-4A, 4-NB , RV-4C, RV-7, PS-7, SP-75, R-8B, SPR-4, SW-8, Qx-er, AUX-7, T-4XC Owner & Service manuals

Heathkit SB-220 - The Heathkit SB-220, two 3-500Z, amplifier made a notable impact in the world of amateur radio when it debuted in 1975. Resources and modifications

ICOM 746 Temperature Measurements - The ICOM 746-Pro has acquired a history of NEC 1678G (IC-151) MMIC and driver transistor 2SK2975 failures. The failure of IC-151 appears to be a combination of ESD damage from electrostatic charge on the antenna entering IC-151, and perhaps thermal heat.

Kustom CB & Stereo - CB Radios, 10 Meter Radios, Base Station Radios, Amateur Radios, Wilson, Firestik, Monkey Made, Striker Antennas, Cobra, Uniden, Galaxy, Connex, Magnum, Ranger, General Radios in Phoenix, AZ

ICOM Rig Control - Freeware amateur radio transceiver control program tested with IC-756 Pro.