Towertalk
[Top] [All Lists]

Re: [TowerTalk] Inverted V for 160/80 on the same feedline

To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] Inverted V for 160/80 on the same feedline
From: "Frosty" <frosty1@pdq.net>
Date: Wed, 20 Apr 2011 16:51:30 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
You might go look at the antennas that the guy at HY-Power antennas sells 
they seem to be good for the money.

I don't have anything to with him except I have one for 40/80/160.


Charles F. Frost
Frosty K5LBU
frosty1@pdq.net

----- Original Message ----- 
From: "Dick Green WC1M" <wc1m73@gmail.com>
To: "'Mike Fatchett W0MU'" <w0mu@w0mu.com>; <towertalk@contesting.com>
Sent: Wednesday, April 20, 2011 4:35 PM
Subject: Re: [TowerTalk] Inverted V for 160/80 on the same feedline


> I've had good results on CW using a 80/160 trapped inverted vees made with 
> a
> pair of Unadilla/Reyco traps.
>
> 73, Dick WC1M
>
> -----Original Message-----
> From: Mike Fatchett W0MU [mailto:w0mu@w0mu.com]
> Sent: Wednesday, April 20, 2011 2:26 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Inverted V for 160/80 on the same feedline
>
> In theory then you should be able to get a decent swr for both bands.  I
> don't really care about the bandwidth too much as they will be used for
> CW in a contest.
>
> The goal is to have a good match and a single feedline for weight,time,
> baggage considerations for travel.
>
> W0MU
>
> On 4/20/2011 12:20 PM, Jim Brown wrote:
>> On 4/20/2011 10:53 AM, Mike Fatchett W0MU wrote:
>>> This might also be called a Fan dipole.
>>>
>>> Can you run 160 and 80 on the same feedline with decent swr?  I have
>>> tried to model this and have not been very successful.
>>>
>> The short answer is yes, sort-of.  In general, the longer antenna will
>> show the same SWR bandwdith as it would without the higher one, and the
>> higher one will have it's SWR bandwidth reduced by about half. My
>> experience is with 80/40 fans, and with 20/15/10 fans, and these
>> characteristics show up both in the NEC models and in measurements of
>> real antennas.
>>
>> This is exactly the opposite of what happens with the loaded multi-band
>> dipoles like those sold by Hy Power Antenna Company -- the higher band
>> antenna retains full SWR bandwidth, and the lower frequency (loaded)
>> band has reduced SWR bandwidth.  I've also modeled those antennas, and
>> like them a lot. In boht cases, the reduced SWR bandwidth can be
>> compensated with a tuner and losses minimized by using low loss 
>> feedlines.
>>
>> For more detail, see my applications notes on Antennas for Limited
>> Space.  There are two that compliment each other  -- one is text, the
>> other a power point presentation.
>>
>> http://audiosystemsgroup.com/publish.htm
>>
>> 73, Jim K9YC
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk 

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

<Prev in Thread] Current Thread [Next in Thread>