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So, does anyone know the actual operating bandspread of these mobile amps?
Are they only capable of operating 11/10 meters, or can they be used on lower freqs? I mean, will they work down to 20 meters, or 40 meters even?
Well, if they are for stationary use, why bother with the coil and cap hat in the first place? (never mind that placing the coil directly under the cap hat effectivly kills any benefit of a cap hat anyway) It's a stupid design IMHO.
Marconi, towards the end of the article look at figure 9-40 representing the actual measured results of load verticals with and without cap hats.
You can see that adding a cap hat increases the amount of current distribution towards the top of the antenna.
W8JI claimed that he measured not...
Thanks for the info Moleculo. I perused the HiQ website, and they sure make some impressive antennas! Until my budget improves I will have to stick to my cheapy experimental antennas, but I am having fun!
Those fancy hoop type cap hats are beyond my fabricating skills I'm afraid, but I...
Actually more like this, except with a 3 or 4 foot whip on top. (that's about as high as I can get without banging overpasses and such)
I am also going to redo the cap hat and put twice as many radials on it.
I'm still in the experimental stage.
So I added my Hustler MO-4 mast section, and went to Ace Hardware and bought some 3/8X24 threaded couplers to make the cap hat since my big aluminum mounting thingy is not going to work until I can beg/borrow/steal a drill press.
The result so far is the lowest resonant frequency is now 5.27...
How high is your 5/8 wave mounted, and what frequency are you xmitting on?
Do you have a decent ground, RF and DC?
How much power are you running, and have you set the mic gain so the ALC is within the operating parameters?
What is the CRTC?
Great points Doc, I completely forgot to mention that I have ordered a Hustler MO-4 22" stainless shaft, so I will mount that on the coil, and my home made capacity hat on top of that.
I actually thought of making the type of cap hat you are referring to, (I have been studying KØBG's website...
So I got the antenna mounted and tuned, (even with the somewhat cryptic instructions) for a couple of bands.
I haven't had much time to fool with it, but found the resonant point for 40 and 10 meters.
It comes with an expandable whip for the "stinger", very reminiscent of the old car...
Pictures you say? OK, will do. I am seriously thinking of homebrewing something like the Hot Rodz that DX Engineering sells
Hot Rodz Capacity Hat Hustler Antennas Top Hat
on top of the MFJ mini bug catcher. It's food for thought, but will have to wait for some warmer weather. Well, it's going...
Thanks everyone for the replies.
BJ & Moleculo, I had Hustler stuff years ago, 10M and 75M resonators I think, but not the high power versions and I remember them working OK.
My problem is that I think they would be too tall to mount on the top of the van, and I don't want to cut any more...
Anyone here have any experience with the MFJ 1624 mobile antenna?
I am looking for something to put on my van when I am traveling but don't want to spend the money for a nice screwdriver type antenna, and besides that, this antenna will be on the top of the van where I already have a 3/8 24...
I had a chance to talk to Sam yesterday when I called in for an RMA# for my 257HP. He mentioned the next batch of 1012's will have a button on the front panel to switch between 10 and 12 meters.
Also, he said that the new 257HP will retain memories no matter how long you have it unplugged...
ADMIN was quick to respond with a password reset, so I am back on.
Problem is, when my new call was added, all the info (BIO, pics, etc) from my old call was "disappeared".
No big deal, just had me going there for a bit!
:crying:
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