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What RFI would that be? I'm not particularly interested that a station 25 miles away gives me a needle width more than any other 5/8th's wave antenna. For that kind of money, the damn thing ought to be cutting my grass.:tongue:

Look at a Sirio 827. Made from 6063 aluminium tubing which is a lot more expensive than glass fibre. 8 radials, the hub is made from some sort of alloy which is cast. The tuning coil is purpose built for the antenna. All in all it takes a little time and effort to produce such an antenna...

I don't care if they have a anechoic chamber, thats besides the point. A child could have designed a better looking more practical antenna. They have spent absolutely no time and effort on the coil section to make it either weather proof or pleasing to the eye. George, I know what the coil does...

Here is a prime example of what I'm taking about. Here is the Sirio 5000 mobile antenna. Developed and designed to a very decent level with each componant part designed to do a specific job which cost money, time and effort. Enclosed to keep the weather out and the finish job looks excellent...

When Sirio made their 'Top one' antenna I couldn't help noticing the basket was made from the same materials as the Vector basket but the basket was inverted. It became obvious to me that Sirio was using surplus parts from other antennae to produce new models. Then we get the media hype that...

We get wind here all the time and i can assure you those of us with antron's and imax's suffer much more than the aluminium boys. Not just wind affects them, really heavy damp weather also loads them up with static. Some around here get S9 of static when this happens.

Robb wrote You'd be amazed how fibreglass coated wire picks up static compared to aluminium. Around these parts both Antrons and Imax antennae are regarded as 'static bombs'. Sirio place anti static balls on both the new vector and their 5/8th wave antennae, they do this for a reason. If...

It doesn't really matter what conditions you have booty as long as you subject both antennae to the same. Same place, same poll, same feed etc and you can't go wrong.

My point was using two parallel antenna's on different poles is futile and rather pointless because of the underlying problems i discussed. One set up is the way to go.:thumbup1:

Havn't read those but thanks anyway. I thought it would be useful to have a thread people can read without trawling through other threads.

Why would you break down any solder joints? Lower the antenna, unscrew the pl plug, unbolt the antenna then put the next antenna on the pole, re fasten the pl plug and off you go. A five minute job.

There are many pitfalls in testing one antenna against another. I have performed several tests over the years comparing various antennae mainly verticals. Firstly, I am not going to consider factors such as potentials for electrical ground because I don't think they are relevant to these tests...

I already have done several tests using Sirio 827, half wave gp's 5\8ths wave gp's with and without ground plains, isolated from the mast and choked. All on the same mast using the same set up and the same radio. Tried several different methods and have noted the results. I'm not criticizing...

To give you an example Marconi, you are talking about needle widths here in test results so lets further elaborate:- Lets just say you think you've soldered both PL plugs in the exact same way but unbeknowing to you, the soldering on one plug is 20% more efficient than on the other. Where does...

One rule of thumb for testing antennae: both antenna's MUST be on the same mounting pole with the same coax, same pl plug, mounting pole at the exact same height, the coax running along the ground in the same place and preferably both tests should be done within 10 minutes of each other...

Something I discovered today about the rf gain on this radio. The rf gain knob twists round from 7'oclock to 5'oclock. I have listened to many stations on FM and SSB over the past few days and on my radio there is absolutely no gain at all from 1'clock to 5'oclock. None at all. There is however...

Half wave dipoles won't give the same gain as a GM, the GM is a 5/8ths dipole. I don't see anything special about the GM that would suggest that a different 5/8ths dipole couldn't match it. Electrically they would be very similar especially if you used the stub and cap tuning method.

???? Why 2 different frequencies?

I have one of these, the 'rf rain' version and I get a similar problem on SSB with local stations. The audio is distorted unless I turn the rf gain down to about quarter past. Can Hans sort this problem?

I wouldn't say the Gainmaster is a revolutionary design, after all its a dipole, It has a few stages i've never seen before in a design. Can't remember seeing a design that used a wire for the top half of the dipole and the feed coax choked off to provide the electrical length for the lower...