Hi Lew, You asked, "How do you all feel this Rectangular antenna will perform?" The answer to the question may be ahead, in your experimentation. Tell us more...
Guys, I'm having a problem finding the SD9 protective diodes in my SGC-230 S/N= The left column is what I read on all the 2 leg SMDs on the board. The right...
... strikes? Hi Geof is the name, My 230 got hit by lightning, turned out the CPU had blown yet it LOOKED OK!!! Had to claim from house insurance for a new...
I would like to run a delta loop (143ish Ft total) starting at the peak of the roof (35ft ht) to a fence post(6ft ht) in the back yard then along the back of...
I've got two SG-230s that died after lightning strikes several blocks away. I looked into fixing them and found some of the diodes, they are normal 1N914s and...
Hi, I have been working on the SG-237 tuner that a fellow ham gave to me that doesn't work. I have checked that the RF detector works. When a signal is...
Hi Harry, SGC has a light bulb test they recommend. http://www.sgcworld.com/lightbulbtesttechnote.html Hopefully that little fellow will awaken for you and...
I am sure a Smartuner tuner can perfectly match the antenna impedance, but I am concerned about the resultant radiation pattern. If I use the same antenna...
Since you're using a random wire, you will get a somewhat random kind of antenna pattern. You could model this with some antenna-modelling software, but why...
Dave, I havn't used that method since I was in high school and was running a DX-40. Boy does that bring back memories. The problem is that the tuner does...
Can’t you put stainless threaded bar through window frame or something like this: http://www.m0mcx.co.uk/gallery/picture.php?/2298/category/131 (You can do...
At least some of the results will depend upon what you plan to use as a counterpoise. BTW, 45 feet is quite close to resonance on 60 meters. Joe N1KHB In a...
At that length (height) you will likely get the best performance on 20M where it will behave as a 5/8 wave vertical. On 30M it should perform much as any 1/2...
In addition to the 0.25 wave resonant at 60 meters comment that I made earlier, it occurs to me that 45' is also darn close to being 0.50 wave resonant on 30...
Matt, Is there an attic vent at the peak? Could you put the tuner in the attic? If you punch a hole in the ceiling in the corner a closet, it is out of sight,...
Thanks John, Randy, & Joe for your great comments. Joe, what software did you use to determine the radiation angle? It sounds like I would be better off to...
How did you determine the 57d radiation angle? To achieve a low angle across all bands, I guess I would have to have a selection of several vertical...
I have a homebrew 43-foot vertical with a 1:4 unun at the base. My worst-case SWR from 40-10 meters (at the unun) is 5:1 on 20 meters. Since I'm feeding the...
Yes, somebody did optimize on 43 feet for a vertical. That provides 5/8 wave for 20M. On lower bands, it behaves as a shorter vertical. On higher bands its...
I am thinking that an alternative is to install one 43' vertical wire for 20 & 40, and a 2nd shorter wire (say 5/8 for 10m) beside it to use on both 10 & 15m...
Sorry, that is unknown to me. I would simply have to experiment to see what kind of results I get with two verticals and one feed. Also, if any of the...
John, are you or anyone else familiar with radiation pattern software that would predict the interaction of 2 monopoles in close proximity? I appreciate...
Don't know how the radiation angle would be affected, but they would each affect the others tuning. But if you are using an auto-tuner, who cares? (HI) I...
Greetings: Last week, I finally retrieved my SG230 from the top of my tower after over a year of non-operation. It was installed as an all band antenna,...
depending on when built, the sgc 230's are different. mainly microprocessors. call sgc and give them the serial # and they will be able to tell you if it has...
Does anyone have a PDF schematic of the SG231? The SG231 manual has 4 pages of schemaic but one of the pages is duplicated and the page containg the CPU seems...
Why not just use 1/4 wave elements for each band of interest connected to one common feedpoint like a fan dipole - that way you could use the antenna 10 thru...
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