40 windom

ZMV Spiral antennas - An experimental antenna similar to the TAK spiral antenna was evaluated for SWR response over the frequency range of 7.0 to 7.3 MHz, or the 40-meter band.

W5VMs Shorty 40 Antenna - A shortened dipole for 40 meters band by Martin E. Meserve

40 Meter delta loop - A delta loop wire antenna for 7 Mhz quick to setup by KC4HW

Multi-Band Mono Delta Loop - Build a Multi-Band Mono Delta Loop for 40, 30, 20 and 15 Meters.

80-40-20 Meter Dipole antenna - Multiband dipoles capable of operating on 80 through 6 meters band with a tuner by KJ4EX

QRO End Fed Half Wave Antenna Coupler - A 40m through 20m QRO End Fed Half Wave Antenna Coupler by Steve Yates - AA5TB

The Helical Windom Antenna - A marriage of the windom and slinky antennas, experimental home brew antenna by NC4TC

G4FON Magnetic Loop Antenna - A simple multi-band magnetic loop antenna designed for 20, 30 and 40 metres, but by changing the overall length of the wire coverage of other bands is feasible

Handi-tenna 440 Beam Antenna - KG4IHJ 4 elements handitenna for 70 cm

Duoband DK7ZB-Yagis 2m and 70cm - These Yagis cover the range of 144-146MHz on 2m and 430-440MHz on 70cm. They can be used for alle modes (FM and SSB/CW). On both bands the SWR is good across the whole band.

I7SWX Coax-Fed multiband antenna - This simple multiband antenna works on all HF bands from 3.5 to 30 MHz, including WARC bands other than 10.1 MHz.

Valcom - Valcom Guelph specializes in the design and manufacturing of a full range of MF Beacon 100 KHz - 600 KHz, AM Broadcasting 540 - 1700 KHz, HF 1.8 - 30 MHz, VHF 30 - 300 MHz and UHF 300 - 1,200 MHz and SHF up to 6 GHz antennas based in Canada

RFTec - Coax Cables and Connectors, DC to 40 GHz RF cables & test cable assemblies, surge protectors, SMA connectors, adapters and termintators

JefaTech - Coax Cables and RF connectors, mobile antennas, cantenna supplies and kits, wifi antennas and adapters, antenna mounts, surge protectors

WSCGen - Signal generator using the PC soundcard to output continuous tone, CW, SSTV, AO-40 telemetry, and PSK31 test signals with variable AWGN. The program will also output to a RIFF .wav file by AE4JY

6L6 Transmitter - 40 meters band 5 watts transmitter, uses a 6L6 with a 6X5 rectifier and a 0D3 voltage regulator tube on the screen.

Homemade CW key for Practice - Video of an homemade morse code key for practice

QRP transceiver for 7 Mhz - An optimized QRP transceiver for 40 meters band

Homebrew 40m CW Transceiver - 7N3WVM homebrew project of a 3 W output CW transceiver on 7 MHz band

40 Meter QRP Transmitter - A simple 40 meter CW transmitter, it sports full break-in operation and 250 mW of output power.

The Rock-Mite CW Kit - The Rock-Mite is a 40m CW kit offered by Small Wonder Labs . It features built-in keyer, direct conversion receiver with a crystal RF bandpass filter, 500 milliwatts of power, and switchable frequency offsets to work around QRM

40 meter QRP CW transceiver - Home made QRP CW transceiver for 7 MHz by JF10ZL

Homebrew 30m CW Transceiver - 10.100 - 10.140 MHz 3 Watts output by 7n3wvm

Receiver Dynamic Range - Receiver dynamic range is the ability of a receiver to receive a weak signal without loss of readability while a strong signal is present.

40 m Band Direct Conversion Receiver - Practical and usable direct conversion receiver for the 40 m CW band