[TowerTalk] Lossy traps?

[Jerry K]

Yes Sir, I did. That's why I bought the Force 12 C3XLD.
73, Jerry W5KP

Dan Hearn wrote:
> Did you ever stop to think that the usual tri band trapped beam uses a single coax feed for all bands and to get a 50 ohm feed point impedance it is necessary to detune the elements from their best length for gain or f/b. In addition, the element spacing is the same for all bands so another compromise there.  
> 73, Dan, N5AR
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com [mailto:towertalk-bounces at contesting.com]On Behalf Of Jerry K
> Sent: Wednesday, October 29, 2008 7:05 AM
> To: Tower Talk
> Subject: Re: [TowerTalk] Lossy traps?
>
> A fixed element non-trapped tribander with only three elements appears
> to be an oxymoron. In the only comparison I can offer, I ran a standard
> Moseley TA-33 trapped tribander for years with decent results, finally
> went to a Force 12 C3XLD (3 bands, no traps, but F12 doesn't call it a
> "tribander") and the difference was literally astonishing. But the F12
> was a $1400 antenna with 10 full-length elements on a 33' boom with
> separate feeds for each, weighs 75 lb, and is essentially three
> monobanders on a common boom (10M used 4 elements). From day one the
> Force 12 was the proverbial 'nuclear weapon' in a pileup. The difference
> was dramatic, and yes, people 5000 miles away and more certainly did
> notice the difference. Just for fun, I also occasionally ran QRP to that
> antenna and had a blast trying to convince Europeans I really was
> running only 800mw. :)
> 73, Jerry W5KP
>
> foxbw at comcast.net wrote:
>   
>> How "lossy" are traps on a trap tri-bander?   Some manufacturers of non-trapped tri-banders cite the lossy aspect of traps, but how real is that loss?   Can it be measured?   Would someone 500 or 5000 miles away notice the difference between a  trapped tri-bander and a similar tri-bander antenna without traps?  Notice I said tri-bander, not mono-bander, SteppIRs, etc.
>>
>> Anyone have any idea?
>>
>> TNX / 73,
>>
>> Barry - W1HFN
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