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Very interesting! However, it'll probably display and operate any two bands the user chooses. Probably user can chose alternate bands on the fly.

I originally suggested a couple of Hy gain SPT 500's, but due to commercial site requirements, the site technician suggested some antennas without radials, so the GM it was. I still think we should have used Penetrators.

Since it's a 10M repeater, and 10M cavity filter/duplexers are rather large, and very hard to find, it's a split site system. An individual GM at each site. Receive site is 29.520, and the TX is set for 29.620. SWR at 29.620 is 1.5:1. Good enough.

Not high enough, in my opinion, for good local work, but you will work DX like crazy! You must try and raise it!!!

No ham would. You can turn those off.

I use my OPTIMA Mk1 extensively on 10 and 12M. No problems tuning in any sideband station, as the clarifier has a wide range. It is a superb radio for what it is and I find it superior to the Magnum 257. The continuous tuning is a lot easier, and the 5 khz increments are useful on...

Obviously. Neither is the OPTIMA Mk3, yet it covers 12M nicely.

I just received this from my local AnyTone dealer. He claims that it will arrive in 3 weeks and he has 100 on order. My only beef is that it doesn't go down to 24.000 MHz.

We have a 10M repeater on 29.620. I bought two GainMasters for the repeater (split site). They don't quite tune up up there, so we're using two small home-made 10M tuners. We needed the GM's because it's a commercial site and antennas with ground planes won't fit there.

I have no idea how the Imax 200 works without radials, unless it is a delayed feed single extended Zepp. According to "The Imax 2000 EXPOSED!" adding ground planes to the Imax improves it's performance significantly. Nevertheless, Having compared both the Imax (with radials) and the...

I have been saying this for years... for some wack reason, no one believed me. The Imax myth persists, I guess.

Excellent question! To tune up the antenna, you need to be as far away as possible from any metal objects in proximity. When I tuned up my new SPT-500, I couldn't get it to tune up on 28.800 MHz. Determined that it was too close to my tower. Moved it about 20 feet away and all as good...

Here are all the manuals for the Penetrator and SuperPenetrator 500, both old version and new. And an ad from 1972

The only manual I don't have is #801285. Ed

I'll do better than that... I will email the manuals to you. They're all PDFs. Ed

In the larger scheme of things, the exact dimensions and orientation doesn't matter, as long as the reactances posed by the matching system remains the same. Possibly done for manufacturing efficiency. Copyrights and patents have nothing to do with it, as Hy-gain manufactured it before and...

The total overall length of the matching system appears to be shorter than the original, by about an inch or so. I somehow suspect that was done to provide a better match on 10M. My original developed a break in the internal link from the SO239 to the matching assy, (probably due to...

The original 1970's era '500's were designed for CB, and the '70's instructions showed appropriate measurements for CB. I took my 1975 version, simply shortened the driven element, and it tuned up beautifully on 10. The current SPT-500 instructions are based on the originals, and are...

Sigh. I have no idea what Marconi is on about. I have had one of these beauties for 35 years and another for 4 years. They should work right out of the box. Now. Hygain markets this as a 10/12M antenna. By FTC regulations, they cannot market this antenna to CB'ers because it is an...

Magnum 257HP vs. Optima Mk3: No doubt, the '257 is quite a capable radio, excellent AM audio, good power and has some features useful for 10M ham radio. Deficiencies: It doesn't cover 12M; it's frequency agility is compromised by it's 10 kc "raster", or slot. I find this...