Problems with local QRM on short wave? Very often the answer to this question is a clear 'YES'. Those living in rural areas know how 'clean' the frequencies can be - except maybe the near-by high-power land line makes noise...
However, most interferences are caused by local electronic sources, like TV's, computer, bad connections.
With this new accessory you can get rid of local interference up to an S9 level almost entirely; the result is a clean QRG! You don't have to know what kind of a interference is present neither would you have to have knowledge about the location of the interference. It doesn't matter if the interference originates from the own Packet station of from a welder 100 meters away.
The QRM Eliminator is inserted into the feedline from the trx to the antenna without any additional modifications required to the radio. The box has a built-in PTT control which enables the Eliminator to stay connected during transmit. An additional auxiliary receiving antenna is required, though, like a 2m antenna or simply a couple of meters wire in the shack.
The unwanted signal is received with both antennas resulting in different phases. The QRM Eliminator now allows to adjust the phase angle as well as amplification in a way to cancel out the unwanted signal before it reaches the receiver front end!
It's based on a totally innovative concept and cannot be compared to the normal 'noise blanker' performance.
Dimensions: 200x130x56 mm
Terminals: 3xUHF connectors for TX, base station and auxiliary antennas, 2 x Cinch jacks for power supply and PTT.
Power supply: 12V/150mA.
|26000||Available again in February 2017||159.00 €||Buy now|
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Download: Review from FUNKAMATEUR 1/15 (PDF, DE, 432KB)
This is an innovative and unique concept for antenna tuning; it simplifies the tuning process for the operator and avoids unwanted QRM for fellow-hams! AVOIDS sudden cut-off of the solid state PA and EXTENDS the PA's life time.
Completely OMITS interfering carriers during the tuning process. More ACCURATE than compared to an SWR meter. Tune while receive: Connect the box to the antenna feed line; switch on and you'll hear an S9 white noise. Adjust the antenna tuner hitting the 'dip' of the noise - that's it! Now the antenna is tuned to 50 Ω for transmitting. If you forget switching the EZITUNE off no problem: a built-in VOX protects the unit against any damage while transmitting.
Additional data: max. power 200 watts, dimensions 200x130x30mm, power requirements 12V/30mA. Terminals: 2xUHF (female).
|26020||125.00 €||Buy now|
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Let this microprocessor controlled MFJ Contest Voice Keyer call CQ, send your call and do contest exchanges for you in your own natural voice! Store frequently used phrases like "CQ Contest this is DA0HQ", "You're 59" . . . "QTH is Ilmenau" and more! Contest by pressing a few buttons and save your voice.
You can record and play back five natural sounding messages in a total of 75 seconds. EEPROM technology keeps messages stored for up to 100 years -- no battery backup needed.
You can repeat messages continuously and vary the repeat delay from 3 to 500 seconds. Makes a great voice beacon and calling CQ is so easy. A receive audio jack lets you record and play back off-the-air signals -- great help if you didn't get it right the first time! No more "Please repeat".
A playing message can be halted by pressing the Stop Button, your PTT mic button or by your VOX PTT line. A closure to ground via remote control or computer also halts messages.
Has jack for remote or computer control (using CT, NA, TR or other program and its interface). Lets you select, play and cancel messages.
The MFJ-434B is transparent to your microphone -- your mic's audio characteristics do not change when your MFJ-434 is installed. Dual controls make it easy to tailor audio level to match your voice.
All audio lines are RF filtered to eliminate RFI, audio feedback and distortion. An audio isolation transformer totally eliminates hum and distortion caused by ground loops.
It's easy to use -- just plug in your 8 pin microphone cable (FOster round or RJ45) and plug the MFJ-434B shielded cable into your transceiver's mic connector. Internal jumpers let you customize it to Kenwood, Icom, Yaesu, Alinco or Radio Shack rigs. Adaptor cables Forster and RJ-45 are included. Use your station or built-in microphone for recording.
Built-in speaker-amplifier lets you monitor stored messages. 3.5 mm speaker/headphone jack. SMT technology. Use 9 Volt battery, 9-15 VDC. Size 162x162x62mm.
Model MFJ-434 (no "B", discontinued) is suitable only for radios with 8 pin round mic connector (Foster connector). Current model MFJ-434B has connectors and cables for both 8 pin round and 8 pin RJ-45 mic connectors.
|MFJ-434B||MFJ Voicekeyer, 8pin round, RJ-45||252.00 €||Buy now|
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