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Reviews Categories | Antennas: HF: Vertical, Wire, Loop | RF-Systems MTA & GMDSS Help


Reviews Summary for RF-Systems MTA & GMDSS
RF-Systems MTA & GMDSS Reviews: 2 Average rating: 5.0/5 MSRP: $165 euro
Description: The Magnetic Transfer antenna is the first rod antenna in
the world with wideband coverage (0.5 - 30 MHz) without an
antenna tuner. The antenna is only 2 metres long, and 32 mm
in diameter. No radials are required. Reception pattern is
omni-directional and the polarisation is elliptical, which
reduces polarisation fading. The antenna is passive, so no
intermodulation products are generated and overloading by
nearby transmitters is impossible. The receiving element, a
helical in the "normal" mode is grounded and the received
signals are transferred only by a magnetic field. Thanks to
this Magnetic Transfer technology, MT antennas are much
less sensitive to man-made interference sources such as
computers or fluorescent tubes, compared to normal rod or
whip antennas. Coaxial lead-in cable to the receiver.
Heavy-duty construction. The special version for the Global
Marine Distress & Safety System (GMDSS-NAVTEX) delivers a
twice as strong signal on long- and mediumwave as the
standard MT version. In the shortwave bands the signal
level is nearly equal, but above 25 MHz the GMDSS version
delivers less output compared to the standard MT version.
The GMDSS - 2 is the smallest passive wide band antenna in
the world. It is only 1,25 mtrs long and neither radials or
an antenna tuner is required. Its construction is the same
as from it's larger brother the standard GMDSS, but it has
a different helical receiving element and associated
matching network to compensate the shorter length. The
GMDSS is designed for smaller boats, but is also a perfect
passive antenna for those living in an apartment with just
a small balcony as mounting place for an antenna.
Features MT & GMDSS
* Wide band coverage, no antenna tuner required
* Omni directional, elliptical polarised
* Frequency range: MT : 500 kHz - 30 MHz
GMDSS: 100 kHz - 25 MHz
* Just 2 mtrs long, 32 mm diameter
* No radials required
* Grounded antenna element, no static built-up
* 50 ohms impedance, coax to the receiver
Features GMDSS-2
* Wide band coverage. No antenna tuning unit required.
* Frequency range: 500 kHz - 18 MHz (usable up to 30 MHz)
* Compact: only 1,25 metres long, 32 mm diameter.
* No radials required.
* Passive, no intermodulation product
Product is in production.
More info: http://www.rf-systems.nl
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You can write your own review of the RF-Systems MTA & GMDSS.

REMOVED_EHAM_JUSTICE Rating: 5/5 Jun 28, 2010 17:42 Send this review to a friend
Very Good Performer  Time owned: more than 12 months
I had used an RF Systems T2FD for years with great results (very wide frequency range, low noise) but moved to a location where I had no space for a 15 meter long antenna. I bought the MTA because of prior good experience with the company.
Though the literature states that the MTA has reduced performance below 500 kHz (there are different versions for different frequency ranges), I had a blast tuning longwave beacon signals here. Very good and clean reception up to 26 kHz band.
Many people online post comments about how overpriced RF Systems products are, but I find them to be worth every penny. Their products are made in Holland, which is more costly than manufacturing things in mainland China, but the quality control is first rate, something which I'll gladly pay a premium for.
 
KD7RDZI2 Rating: 5/5 Jun 11, 2009 10:23 Send this review to a friend
dependable RX antanna  Time owned: more than 12 months
I have had this antenna for more than 12 years. Physically appears a bit strange. Looks like a V-U vertical fiberglass antenna, but if you touch it and inspect very closely the antenna, you will have a different impression. It's havier, it is flexible. It's design is made to meet highest quality standard. Wind is no problem, statics are no problem, everything is grounded, man made noise is less than a problem. It is very quiet for being a vertical, but signals are strong. Compared to a well made 20meters long T2FD, from 4 to 30Mhz signal levels are similar. Sometimes the T2FD is better, sometimes it is better the MTA. It depends not on the frequency but the lobe of the antenna. For very low angle signals generally the MTA performs better: you can hear some distorted fluttering S2-S3 signals while you don't hear the signal on the T2FD until propagation changes and you might decide to use the T2FD then. Below 4Mhz the MTA is just great and the MTA outperforms with regards the received signal levels the T2FD. I still cannot understand how such huge signals on low bands can be received by this antenna which is so compact.
Below 500Khz I receive stations but performance degrades. Using however a VLF converter by Jackson Harbour Press I could receive stations quite well up to 10Khz.
My MTA is put at about 35 meters high from the ground, about 9 meters from the roof and I use a 30 meters long cable.
The last but not the least, the MTA seems rated QRP transmitting, max. power 5 Watts!
 


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