This video answers the question – “Can an antenna switch be used in reverse, to switch multiple radios into a single antenna system and, is it safe?” The answer is – YES, in most cases – as long as the switch grounds the unused inputs, which is usually the case. The video takes a look at the numbers, describes how much isolation is needed, and then shows how to measure the isolation using a NanoVNA, and finally shows the results using a couple of HF radios.
Antenna
Simple Multi-Band Vertical Dipole by DJ0IP
Simple Multi-Band Vertical Dipole This simple multi-band vertical described below will give you very good performance on 40 through 10m and eve… Read more
Can a Balun be Too Big?
“Oggie Jon McAdams, K3MAH, is getting back into HF and wants to try QRP. Will baluns, coax, etc., rated for higher power cause his small signal… Read more
The Rigid Dual boom Quad from InnovAntennas – LFA-Q – 4el for 28MHz
This example is installed at KJ4AJG and is a 4el for 28MHz. Tom is so impressed, he has ordered another to stack! If you don’t see one for a ban… Read more
Omni-Directional – Circularly (Mixed) Polarized Antenna for 144 MHz / VHF / 2 Meters.
Introduction and Background This is an experimental project that may lead to further development in the future, but even as presented below, it does w… Read more
Topband: Webinar – Waller Flag RX Antenna 101 – How to Construct a WF
“Join us for a webinar on Feb 16, 2017 at 9:00 PM EST Register now! – https://attendee.gotowebinar.com/register/7735767269616129539 JC N4I… Read more
Review
Yaesu FT 817 – CAT, CW decoder, waterfall, frequency readout, audio filter and audio recording.
What this lad has done with this screen for the 817 is astounding. CAT, CW decoder, waterfall, frequency readout, audio filter and audio recording. Wh… Read more
SteppIR CrankIR + Sark-110 “Full portable kit” Unboxing – Part 1
“” “The SteppIR CrankIR is portable a vertical HF and 2 meter antenna, it’s lightweight, high performance, extremely portable… Read more
Comparing the RFinder H1and M1 Devices
In this episode, I talk about the 2 RFinder devices – the original H1, and the new M1. The M1 is now my daily carry Smartphone and 2-way radio…. Read more
Equipment
DU800 – HA8DU Manual Tuners HF+6m
DU 800 HF+6m ANTENNA TUNER FEATURES The DU 800 T optimizes the performance of your antenna and transmitter or SWL receiver by providing adjustable imp… Read more
Alinco DM-30 Digital Power Supplies
Alinco DM-30 Digital Power Supplies are an affordable switching power supply that packs a lot of features including Anderson Powerpole® connectors. Th… Read more
Tech-out of the Xiegu XPA125B Auto Tuner + Amplifier
Today we take a look at the Xiegu XPA125B QRP Amplifier and Auto Tuner hooked up to the Icom IC-705. This amp will work with a variety of QRP rigs inc… Read more
YAESU FT DX 5000MP HF/50 MHz 200W Transceiver
The Yaesu FT DX 5000MP HF/50 MHz 200 Watt Transceivers is a Premium Class of Yaesu radios with 2 Independent Receivers plus many unique options and ac… Read more
MFJ-269C HF/VHF/220MHZ/UHF,.530-230,415-470MHZ,SWR ANALYZER
MFJ-269C Covers 530 KHz-230 MHz and 415-470 MHz . . . SWR . . . Complex RFImpedance: Resistance(R) and Reactance(X) or Magnitude(Z) and Phase(degrees)… Read more
The post Safely using a coax switch to connect multiple rigs to a single antenna system appeared first on QRZ NOW – Ham Radio News.