Providing a voice for responsible scanner users in Western Australia
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Yep, I have an X-50 antenna on the roof of my house for amateur 2m/70cm and I'm very happy with itslipknot wrote:They both seem to do the do the same thing.
Im just not sure if these ones are suitable for ameteur radio. Does anyone use these models?
=D>vk6hgr wrote:vk6jrc wrote:
I have purchased Diamond brand antennas from Tower Communications http://www.tower.visionimage.com.au previously.
The X50 is a good antenna. The difference between the two antennas is that the X-50M/N has an N type connector on it, whilst the X-50A has a SO-239 UHF type connector. The N type connector will have slightly lower losses and is more waterproof than the SO239 UHF connector.slipknot wrote:Thanks Gavin! lol.
Oh gee anyway,
I found two Diamond antenna Models that ive got my eye on for when i get my ameture licence. It says that they are for the 70cm and 2m bands but im not sure if thats true, they dont state that they are for amateur radio use.
These are the models:
X50A
and the X-50M/N 2m/70cm 4.5/7.2dB gain, 1.7m long Antenna (coudlnt find a link for that one)
They both seem to do the do the same thing.
Im just not sure if these ones are suitable for ameteur radio. Does anyone use these models?
That's a Doppler RDF isn't it? Is it mounted to the bottom of an aircraft?Urshtnme wrote:Here ya go
Tyranus wrote:fantastic...and it works how??
It's a kit you can buy and build from the states. It's put together by amateurs.Doppler RDF units determine the bearing to a signal's source by electronically rotating four antennas, arranged in a circular pattern, at a high rate of speed. The signals received at each antenna are combined and passed on to your FM receiver which is tuned to the frequency of interest. The FM receiver detects the incoming signal and produces an audio tone which is then passed back to the Doppler unit. Inside the Doppler unit are two microprocessors which control the antenna switching and process the audio tone, from the receiver, using DSP techniques. The result of this processing determines the relative direction to the signal source. The direction is displayed continuously in real-time on a circular array of LEDs, each representing a degree of angle depending on the number used. In the case of intermittent signals the microprocessors save and display the last directional information (shown as a flashing bearing indicator) until the signal is again active. Active signals are displayed as a steady directional indication. The DSP-RDF Doppler kit being offered by W6DFW incorporates another feature not in the original design. This feature allows direction finding of a jamming signal even when the jammer is broadcasting a tone intended to interfere with Doppler units
can you put that in english?celestial_insight wrote:Google Adcock Antenna Radio Direction Finder. Heaps of info. Sea Rescue Groups use them a lot for 27 Mhz and VHF, as well as EPIRB location. Often on o/s police vehicles you see them in the vehicles for locating LoJack systems.
http://www.google.com.au/search?q=Adcoc ... =firefox-awoobla1 wrote:can you put that in english?celestial_insight wrote:Google Adcock Antenna Radio Direction Finder. Heaps of info. Sea Rescue Groups use them a lot for 27 Mhz and VHF, as well as EPIRB location. Often on o/s police vehicles you see them in the vehicles for locating LoJack systems.
whats a lojack system? and could it help find those ppl that interefered with the police radios back when they were analogue?
Looks like the one thats mounted to the AMSA / Customs Dornier 328-100 aircraft that are operated by Aerorescue. Most likely VH-PPF or VH-PPG. You can see the array towards the front of the aircraft in this photo http://www.airliners.net/photo/Australi ... 1093413/M/Pty wrote:That's a Doppler RDF isn't it? Is it mounted to the bottom of an aircraft?Urshtnme wrote:Here ya go
