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Categories | Antennas: HF: Vertical, Wire, Loop | Hy-Gain SPT-500 Help

Show all reviews of the Hy-Gain SPT-500

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K4THN  Rating: 5/5 May 24, 2014 22:16  Send this review to a friend!
Most Excellent!  Time owned: 3 to 6 months
Back in the day, the Hy-Gain Penetrator 500 was the cats meow...and it still is.
After running a Maco 5/8 for the last 6 years on both 10 and 11 meters, (with pretty good results), it got lightning bit being 60ft up on a Rohn 25G. SWR was still 1.4:1, but the RX just wasn't the same.
So I noticed the 500 being made again by Hy-Gain/MFJ...hummm...should I try it out?
Well, I ordered from R&L...the shipping box was actually more than adequate, no damage to the aluminum tubes. Drove a 5ft pipe into the ground with 2ft out of the ground, ready for the antenna assembly.
I did disassemble the lower part workings to see what made it tick. Found a internal 3" piece of 18ga wire soldered into the SO-239, with the other end crimped to a #8 lug, which went under the head of a long stainless screw which has it's other end thru the hard phenolic base, where the hairpin tuning rod mounts. I replaced this wire with 12ga, and soldered it to a new #8 lug. That's the only mod I made, other than using 2 stainless bolt type hose clamps at every clamp location position...nothing coming loose here..LOL.
Assembly on the ground mount pipe was easy.
I did shorten the radiator length by 8" so as to give it a better SWR spread.
After installing on tower, the results are:
26.815- 1.7:1
28.440- 1.7:1
Lowest SWR- 27.600
Of course, if you only want it for 10 meters, then set the radiator length a bit shorter. They only mention "for 10/12m use only" to get away from the all metal antenna sales restriction to the 11m users .
I can report most excellent results on TX & RX...with a bit of annoyance to the electrical power line buzzing I get now...humm..what is causing this...more so than other antennas at the same height..?
That's for another day to figure out.
Oh..and by the way, the first length of aluminum radiator tubing off the base is a much larger diameter, so hopefully it will not be the weak spot that bends on those Maco's in 70mph winds.
(if you want to chat with your thoughts on the power line buzzing being worse with this antenna, send me an email to K4THNatTWCdotcom) TNX! 
Product is in production.
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