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Old 04-08-2007, 06:53 PM   #15
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I don't understand why shortening the coax would change the SWR. At least any appreciable amount. Presuming the radio output impedance is 50 ohm nominal and the coax is 50 ohm nominal, the only hitch is the antenna. I am not sure you can alter or tune a Firestick.

But, in any event, the losses at even 1.8:1 SWR is practically nothing.

I worked about 80 countries on 10 and 15 meters with a 75 watt rig before I found out the rig was only 20 watts and my SWR was 4:1. After I got the true facts, I couldn't make a contact.
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Old 04-08-2007, 07:03 PM   #16
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Go to the Firestik WEB site mentioned in one of my earlier posts. All the instructions are there.
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Old 04-09-2007, 11:26 AM   #17
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by hamguy:

#4. What is a "no-ground plane antenna that is tip fed."

A little more information, please. </div></BLOCKQUOTE>In general, antennas can be base, center, or end(tip) fed. In the case of a vertical, a base fed antenna will connect the coax to the antenna at the base, a tip fed will connect the coax to the tip of the antenna.

The theory is that in situations where the antenna is partially blocked by air conditioners or is mounted on the side of a vehicle, a tip fed antenna will propagate better than a base fed antenna. Wish I knew how to support this. It is probably dependent on antenna construction and frequency. Hellllpppp. Just reporting what is advertised, which we know is always accurate.
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Old 04-10-2007, 08:15 AM   #18
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OK, I unnerstand.

I have a Gap "Titan" and I believe it is tip loaded.

I talked to the owner of a screwdriver antenna company about their use on a Class A RV. He finally agreed that since the bulk of the antenna must be above the roofline, it was not suited to (in motion) RV optimal use.

I use a push-up fiberglass mast attached to the ladder and a wire wrapped around the length. I push up as much as I can run it through a automatic tuner. Works fairly well and when parked, I push it up to 33' where it works VERY well.
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