Good idea! Sort of hard to believe that hasn't been done before.. anyone have
any data??
bill, K1DY
________________________________
From: Zack Widup <w9sz.zack@gmail.com>
Sent: Thursday, September 14, 2017 4:37 PM
To: Bill Olson; VHF Contesting Reflector
Subject: Re: [VHFcontesting] Log Periodic ?
Maybe someone can bring one to a Central States conference or another
conference where antenna testing is done? Kent WA5VJB has always been
accurate and impartial in his measurements.
73, Zack W9SZ
On Thu, Sep 14, 2017 at 11:13 AM, Bill Olson <callbill@hotmail.com> wrote:
> Hi all, Create claims the gain of the 50-1300MHz LPDA is 10-12dBi (~8-10dBd).
> I don't see how those numbers could possibly be accurate given the element
> taper and the boom length etc.. Reports of performance compared to single
> band Yagis seem to bear that out. I'd guess the realistic gain is more like
> 3-4dB over a dipole. That's like a 2 or 3 element single band Yagi.. Now
> admittedly you'd need 2,3,4, 5 or 6 single band Yagis to do the job since the
> Log Periodic does cover 6 ham bands.. If you can tolerate mediocre
> performance (probably really poor performance on 903/1296) but need the
> simplicity of a single antenna I guess this would be an option, but I sure
> wouldn't go that way,. Heck, it looks like the thing costs $519 too, (from DX
> Engineering at any rate)!! Holy smokes! The way I see it, you're paying for
> having broad band performance which you aren't using.. It works as well at
> 88MHz as it does at 144! Great for a TV antenna but who needs that on the ham
> bands?!
>
> I GET the simplicity factor and agree that ANY antenna is better than no
> antenna, and I KNOW people are using these antennas and are happy with them,
> just saying my piece I guess..
>
>
> bill, K1DY in Maine
>
> ________________________________
> From: VHFcontesting <vhfcontesting-bounces@contesting.com> on behalf of Zack
> Widup <w9sz.zack@gmail.com>
> Sent: Thursday, September 14, 2017 2:23 PM
> To: VHF Contesting Reflector
> Subject: Re: [VHFcontesting] Log Periodic ?
>
> I think if you're close to a metropolitan area with a lot of people to
> work who are close by, the log periodic is the way to go. Some of the
> Rovers in the Chicago area I know use LPDA's. My favorite portable
> location is about 100 miles from the closest stations I work. I have
> found it's advantageous to use a separate, larger beam with more gain
> for each band.
>
> 73, Zack W9SZ
>
>
> On Thu, Sep 14, 2017 at 7:45 AM, Patrick Thomas <p-thomas@mindspring.com>
> wrote:
>> Like all things in contesting, I think it depends on one's goals and
>> circumstances. Sure, an LPDA will not perform as well as long (maybe even
>> mid-length) yagis. But... it also will cost less, take up less space in the
>> vehicle, take up less space/weight on the mast, take less time to set up
>> (assuming you start from scratch), and will only require one run of heavy
>> coax. Plus obviously AN antenna will outperform NO antenna! And as others
>> have mentioned, you can use it for a backup "any band that failed" antenna
>> in the future, if you later graduate to a higher-performing setup.
>>
>> Cheap surplus coax switches of good quality show up fairly often on ebay
>> that can handle frequencies up to 1-2 GHz at a couple hundred watts,
>> switching between 6-10 connectors, and these are easily controlled by
>> anything from an automated arduino to a pushbutton control panel, so I would
>> not be turned off by the need for a switch.
>>
>> Just my thoughts on the matter. I considered building my own LPDA as there
>> are many good calculators out there, but ended up with a large van for a
>> rove vehicle, which will happily swallow many large antennas. Now if it
>> would just run reliably....
>>
>> Patrick
>> KB8DGC
>> _______________________________________________
>> VHFcontesting mailing list
>> VHFcontesting@contesting.com
>> http://lists.contesting.com/mailman/listinfo/vhfcontesting
VHFcontesting -- VHF
Contesting<http://lists.contesting.com/mailman/listinfo/vhfcontesting>
lists.contesting.com
The VHF Contesting Reflector is designed to be a place to discuss all aspects
of contesting on frequencies of 50 MHz and above. We hope to generate
discussions of any ...
>
> VHFcontesting -- VHF
> Contesting<http://lists.contesting.com/mailman/listinfo/vhfcontesting>
VHFcontesting -- VHF
Contesting<http://lists.contesting.com/mailman/listinfo/vhfcontesting>
lists.contesting.com
The VHF Contesting Reflector is designed to be a place to discuss all aspects
of contesting on frequencies of 50 MHz and above. We hope to generate
discussions of any ...
> lists.contesting.com
> The VHF Contesting Reflector is designed to be a place to discuss all aspects
> of contesting on frequencies of 50 MHz and above. We hope to generate
> discussions of any ...
>
>
>
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting@contesting.com
> http://lists.contesting.com/mailman/listinfo/vhfcontesting
VHFcontesting -- VHF
Contesting<http://lists.contesting.com/mailman/listinfo/vhfcontesting>
lists.contesting.com
The VHF Contesting Reflector is designed to be a place to discuss all aspects
of contesting on frequencies of 50 MHz and above. We hope to generate
discussions of any ...
>
> VHFcontesting -- VHF
> Contesting<http://lists.contesting.com/mailman/listinfo/vhfcontesting>
VHFcontesting -- VHF
Contesting<http://lists.contesting.com/mailman/listinfo/vhfcontesting>
lists.contesting.com
The VHF Contesting Reflector is designed to be a place to discuss all aspects
of contesting on frequencies of 50 MHz and above. We hope to generate
discussions of any ...
> lists.contesting.com
> The VHF Contesting Reflector is designed to be a place to discuss all aspects
> of contesting on frequencies of 50 MHz and above. We hope to generate
> discussions of any ...
>
>
>
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting@contesting.com
> http://lists.contesting.com/mailman/listinfo/vhfcontesting
_______________________________________________
VHFcontesting mailing list
VHFcontesting@contesting.com
http://lists.contesting.com/mailman/listinfo/vhfcontesting
|