“Microphones” is the topic for the latest (April 12) episode of the “ARRL The Doctor is In” podcast. Listen…and learn!
Sponsored by DX Engineering, “ARRL The Doctor is In” is an informative discussion of all things technical. Listen on your computer, tablet, or smartphone — whenever and wherever you like!
Every 2 weeks, your host, QST Editor-in-Chief Steve Ford, WB8IMY, and the Doctor himself, Joel Hallas, W1ZR, will discuss a broad range of technical topics. You can also e-mail your questions to doctor@arrl.org, and the Doctor may answer them in a future podcast.
Enjoy “ARRL The Doctor is In” on Apple iTunes, or by using your iPhone or iPad podcast app (just search for “ARRL The Doctor is In”). You can also listen online at Blubrry, or at Stitcher (free registration required, or browse the site as a guest) and through the free Stitcher app for iOS, Kindle, or Android devices. If you’ve never listened to a podcast before, download our beginner’s guide.
VHF
Announcing the AMP-25 Series
We are excited to introduce our brand-new AMP-25 amplifiers! The AMP-25 series do more than just amplify a signal, they also purify your signal as it... Read more
![Kenwood TH-D74 APRS & DSTAR Radio [ Video ] – English Version](https://qrznow.com/wp-content/uploads/2016/08/14095878_1034440039987414_1994225713345294467_n-190x122.jpg)
Yaesu FTM-300DR C4FM Dual-Band
Yaesu FTM-300DR 50W C4FM/FM 144/430MHz Dual-Band Digital Mobile Transceiver The new FTM-300DR provides stable and reliable 50W RF power output. As in... Read more
Compare All BaoFeng Radios
Compare All BaoFeng Radios Web Based Comparison Chart See More: Read more
Alpha 8406 – 6 Meter Linear Amplifier
Whether you are a weak signal operator or a serious contester, the 8406 is the ultimate 6 M amplifier. It handles continuous duty modes like WSJT with... Read more
145 MHz Low Loss Bandpass Helical Filter
Low Loss Bandpass by Mile Kokotov Basic design of the filter is from RSGB VHF-UHF Manual, but I made some modifications. Both Inductors... Read more
Equipment
MFJ-868B GIANT HF + 6M, SWR/WATTMETER
MFJ-868B World`s largest SWR/Wattmeter has giant 6½” meter World`s largest HF+6M SWR/Wattmeter measures a giant 6½ inches diagonally across meter scal... Read more
The MTR4b! KD1JV “Steve Weber” Designs – Produced by LNR Precision 80M/40M/30M/20M in Machined Aluminum Case!
The MTR4B 4-Band Mountain Topper KD1JV “Steve Weber” Designs – Produced by LNR Precision 80M, 40M, 30M, 20M 3-4 Watt Output at 12VDC... Read more
HF SDR Transceiver RS-918 mcHF
Here we take a look at the RS-918 HF SDR Transceiver, a typical clone of the mcHF. Specification: – HF QRP Transceiver,put battery 12v and ANT... Read more
EL/AZ 3D Printed Antenna Rotator – Testing !
“One of the Youtube viewers made a comment a few weeks ago asking about my rotator project. Their comment inspired me to finish it. This project... Read more
Filtered 2400 MHz Driver Amplifier Kits Now Available
This kit has been designed by David Bowman G0MRF and contains all the parts required to drive a PA on 2.4 GHz for QO-100. The completed board will hav... Read more
MFJ-1936T GROUND ROD, W/CLAMP,+342T+WIRE BUNDLE
The MFJ-1936 is a HOT new product from MFJ for those who wish to be QUICK with their antenna set-ups! For those hams on-the-go to their next adventur... Read more
Review
Get Your First Look at the NEW Yaesu FTM-300DR
** Available Late May 2020 ** The new FTM-300DR provides stable and reliable 50W RF power output. As in recent YAESU mobile transceivers, the FTM-300D... Read more
Unboxes the NEW Yaesu FT-891
Yaesu FT-891 Yaesu FT891 New, Exciting Yaesu Field Gear – HF/50MHz 100W All Mode Transceiver – FT-891 · Rugged construction in an ultra-compact... Read more
External Speakers is the topic of the new (November 8) episode of the “ARRL The Doctor is In” podcast. Listen…and learn!
External Speakers Would you benefit by adding an external speaker to your radio? The answers may surprise you. Read more
Elecraft KX2 – Features and Review
Elecraft KX2 Part 2 Read more
How to Solder a Wire
How to Solder a Wire Read more
ADALM PLUTO Frequency Expansion Modification Plus CPU Cores
“Here we take a look at the ADALM-PLUTO frequency expansion modification to give us 70 MHz through to 6GHz. Mine actually went as low as 46MHz!!... Read more
Antenna
Antennas and Connectors!
Dave, KB2UBO, has two questions… One about Whether a ZS6BKW could/should be used in an inverted V? Another about Wheather to crimp or solder con... Read more
![Antenna Fundamentals 1 Propagation [ Video ]](https://qrznow.com/wp-content/uploads/2016/06/d01645880bc21d293eab203a20ce8adf-190x122.jpg)
Wideband Desktop Discone Antenna – 25 MHZ – 2000 MHz Coverage
“Here we take a look at the Skyscan Desktop antenna with a rated frequency range of between 25 Mhz up to 2 Ghz. We test the antenna indoor and o... Read more
18el 6bander – GXP Antenas – 40/20/17/15/12/10
GXP Antenas 18el 6bander Bands 40/20/17/15/12/10 Gain (dBd) 3,9/10,6/10,3/10,5/10,2/10,5 F/B (dB) 22/26/22/23/20/21 SWR 40 le... Read more
![SteppIR DB42 Setup by JA5MHD [ Video ]](https://qrznow.com/wp-content/uploads/2015/03/11038403_10204139844031513_3998216779955717336_n-190x122.jpg)
SteppIR DB42 Setup by JA5MHD [ Video ]
SteppIR DB42 http://blogs.yahoo.co.jp/ja5mhd Read more
