plug & Play Auto Tuner
Plug & Play! You won’t even know it’s there . . . MFJ-939I/K/Y automatically tunes your antenna as you tune your radio. SWR is just always low.
Tunes your coax fed or random wire antennas 1.8-30 MHz from 2 Watts QRP to full 200 Watts SSB/CW.
Matches 6-1600 Ohms (SWR up to 32:1) — that’s a 50% wider matching range than competing products that are less capable and higher priced . . . and it’s made in the USA.
Highly intelligent, ultra-fast tuning!
As you’re ragchewing, contesting or DXing, the MFJ-939 is learning your antenna and the way you operate and storing all this in its 20,000 memories. The more you use it, the more it learns.
Measure & Compute = Instant Match
MFJ-939 uniquely measures your antenna’s complex impedance (R, X), computes the L-network and snaps in needed components for instant matching.
AdaptiveSearch
AdaptiveSearch determines a sub-set of all solutions that can provide a safe match and searches only that subset giving
you an ultra fast match. Others search slowly through all solutions.
InstantRecall
InstantRecall first checks its memory to see if you have operated this frequency before. If so, tuning is instantaneous and you’re ready to go!
MFJ VirtualAntenna Memory
MFJ exclusive VirtualAntenna Memory system gives you 8 antenna memory banks of 2500 memories each.
You can use an antenna switch to select up to 8 antennas and assign each antenna its own 2500 memories!
4 Times More Solutions and Faster!
MFJ has 256 values each of capacitance and inductance for 131,072 matching solutions giving you a finely tuned very low SWR. That`s 4 times the 32,768 solutions of competitors using only 128 L/C values each!
Don`t be fooled by competing products claiming fast search times — if you have a quarter of the matching solutions, of course,it takes less time to finish but it`s not faster.
MFJ`s faster speed comes from advanced technology and software algorithms not from fewer solutions.
Audio SWR Meter
An Audio SWR meter beeps when SWR <1.5, 2, 2.5, 3. Alarms if >3. Audible & Visible Diagnostic messages.
Heavy-Duty Components
Heavy-duty L-network: 10 Amp/1000V relays, RF duty silver mica caps won’t burn up. Safe, reliable, continuous 200W SSB/CW.
As Small as Your Radio
Tiny 6 1/2W x 2 7/8H x 8 3/8D”. 2.4 lbs. SO-39s, random wire ant. & gnd posts.
Never Obsolete . . . Super Versatile
Truly Plug & Play! No settings, only one cable to plug in! Order MFJ-939I, Icom; MFJ-939K, Ken; MFJ-939Y, Yaesu. Specify Yaesu: FT-100/450/950/ 857/897/1000MP/9000/2000 or other.
Never Obsolete!
If you get a new transceiver, simply order a new Plug and Play cable.
Super Versatile! Works with ALL older rigs, classic transmitters, Flex, Elecraft, Tentec, QRP, others. Auto tune antenna — touch tune button on any MFJ-939I/K/Y for any rig.
Antenna
Another Difficult Antenna Situation
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Ham Radio experiment – End fed half wave antenna sloper vs flat horizontal orientation
https://youtu.be/BgEtQOS8mY0 Read more
British Columbia Radio Amateur Copies Signal from Mars-Orbiting Satellite
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VHF
Ham Radio vs GMRS
Ham Radio vs GMRS – Ham Radio compared to GMRS frequencies and modes – which ones is better? Today let’s talk about both of them, ho... Read more
Best GMRS Handheld Radio 2021 – GMRS Radio Comparison
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CHESS CubeSat Constellation to Carry FUNcube Transponders
In 2020, a project between AMSAT-UK, AMSAT-NL, and Swiss universities got under way with the aim of equipping two Swiss satellites — for now under the... Read more
Equipment
$760 Ham Radio Shack From Aliexpress?
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PANADAPTER For Any Radio DC – 160 MHz SDR Antenna Switch
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New! Wattmeter HF/50 MHz FX773 3/5 kWatt
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News
ARRL Interview Explains Background of Ham Radio in Space Film Short
Josh Tanner, the Australian filmmaker who produced the thriller Decommissioned by Perception Pictures, has explained how he came up with the idea to... Read more
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An article describing how radio amateurs can help fill the information “donut hole” by providing post-earthquake “did you feel it” (DYFI) reports via ... Read more
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“Whirlwind Boom” Emergency Communications Exercise Set in Northern Florida
The amateur radio communications team of the Florida Baptist Disaster Relief has created a multi-site radio communications exercise dubbed “Whirlwind... Read more
ARES and Red Cross Cooperate to Assist Storm-Affected Residents in Texas
ARRL Amateur Radio Emergency Service (ARES®) and American Red Cross volunteers joined forces in Texas under the ARRL/Red Cross memorandum of understan... Read more