“Join us for a webinar on Feb 16, 2017 at 9:00 PM EST Register now! –
https://attendee.gotowebinar.com/register/7735767269616129539
JC N4IS covers the concepts and decisions to build your own WF low band high
performance receive antenna. Topics include:
1- What is a Waller Flag
2- Horizontal or vertical poles.
3- Common node noise, and detuning towers or TX antennas
4- Phasing lines and transformers
5- Feed lines and chokes
6- Preamplifiers, filter and R/T switches
7- How to measure pattern (polar plot)
8- How to test and evaluate results.
73
Ken K4ZW”
Videos
Equipment
Belka-DSP radio receive
The Belka-DSP radio receiver is designed to receive radio stations with amplitude, frequency and single-band modulation, as well as telegraph signals... Read more
144 MHz filter stops interference
Designed and manufactured by SOTABEAMS, this neat bandpass filter is for use with handies (HT) in areas with multiple transmitters. In such areas, man... Read more
First KX3 with PX3
“I’m trying out the first KX3 with PX3 retrofit. It is big, but it looks really nice and sounds amazing! Cost for parts, labor and US ship... Read more
Mercury III LDMOS Power Amplifier Kit
Mercury III https://www.km3km.com/ Read more
Parametric Receive Audio System Equalizer – Heil Sound
The Heil Parametric Receive Audio System Equalizer (PRAS EQ) is a state-of-the-art audio processor that enhances the internal audio systems of amateur... Read more
NanoVNA a $50-$70 Ham Radio Antenna Analyzer?
AURSINC Vector Network Analyzer 50KHz -900MHz HF VHF UHF Antenna Analyzer Measuring S Parameters, Voltage Standing Wave Ratio, Phase, Delay, Smith Cha... Read more
IC-705 QRP SDR Transceiver Update, Available in Japan around April 2020
IC-705 There has been massive interest around the world about the new IC-705 QRP SDR transceiver since a concept model was shown at the Tokyo Hamfair... Read more
Review
Noise reduction in your shack – RFI
Also read This Common-Mode Chokes by Chuck Counselman, W1HIS is well worth reading. Read more
LimeSDR Mini – Full Duplex SDR Transceiver – DATV – QO100 – Es Hail 2
The LimeSDR Mini development board is a hardware platform for developing and prototyping high-performance and logic-intensive digital and RF designs t... Read more
Eliminate Interference with the MFJ-1026 Noise Canceller
Wipe out noise and interference before it gets into your receiver with a 60 dB null! Eliminate all types of noise — severe power line noise from... Read more
NanoVNA To Test The Loss & Length Of Coax Cables by Jim W6LG YouTube Elmer for Ham Radio Basics
“The NanoVNA does many things. Two of which are testing coax cables for loss and length. Jim W6LG shows how to do both in this first video about... Read more
Radio Receiver Sensitivity
The sensitivity of a radio receiver is a key operational parameter and it is limited by the system noise. The sensitivity of a radio receiver determin... Read more
