Fred,
One final thing I'll throw out as a head's up, is that since the off
center fed antenna is unbalanced, there is a bit more of a chance of
RFI then with a center fed dipole. More likely if you run power.
I had some RFI when running a THP solid state amp on 1 or 2 bands,
which caused the amp to fault. A ten turn coax choke at the feedpoint
fixed it.
I won't say it is a common problem, but it is something you should be
aware of.
You might want to look at reviews on e-ham to help with your research.
73,
Steve KW3A
On 7/18/2013 4:51 PM, Fred Adams wrote:
> I just got my wife to help me do a little measuring and I believe I can
> just fit the 80 meter windom antenna in. I plan to put a small station in
> my bedroom and I have a small 38 foot roan tower outside my bedroom so I
> think I have the support in the perfect place. It looks more interesting
> all of the time. I am close to the city airport so I can't put up anything
> very high. My base station is about 42 feet at the apex and does fine for
> what I do. On my base station I have a 80 double bazooka and a DXCC
> antenna. Thanks to all of you guys for the info. I will let you know how
> things work out. I think I will give the windom a good try. Thanks again,
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Steve Forst
> Sent: Thursday, July 18, 2013 3:52 PM
> To: [log in to unmask]
> Subject: Re: Windom 6 thru 80 meter antenna
>
> Ok Fred. If you plan on using a support to hold up the
> balun/feedline, figure about 90 feet for the long end of the antenna and
> 45 feet for the short end. If you are lucky, you will have an
> existing support at the right spot. I didn't use any support for the
> feedpoint, but many people do.
>
> 73, Steve KW3A
>
> On 7/18/2013 3:43 PM, Fred Adams wrote:
>> Steve, thanks much. I plan to do some outside measuring and a little
>> further checking on the antenna but I like the sound of the info that
>> you provided. Thanks again,
>>
>> -----Original Message-----
>> From: For blind ham radio operators
>> [mailto:[log in to unmask]]
>> On Behalf Of Steve Forst
>> Sent: Thursday, July 18, 2013 3:29 PM
>> To: [log in to unmask]
>> Subject: Re: Windom 6 thru 80 meter antenna
>>
>> Fred,
>>
>> It is basically the same length as a full size 80 meter dipole, just
>> that the feedpoint is off center. Depending on what brand you go with,
>> it will be somewhere around 133 - 136 feet long and feedpoint will
>> be around 2/3 from one end. Baluns will also vary: some use 4:1 and
>> others use 6:1.
>>
>> I had one up a few years ago and it worked quite well. It works
>> harmonically on bands above the lowest band (80 meters), so no tuner
>> needed on 40, 20, 10, and even on 12 and 17 meters. It's not resonant
>> on 30 and 15 meters although you can use a tuner and make it work.
>> There is also a mod to add a parallel dipole to make it resonant on 30
>> and 15.
>>
>> Mine was set up in a slanting configuration, with one end hanging
>> down from the highest point. I think it can work in a few different
>> configurations, but maybe the flat top or inverted vee are the most
>> common.
>>
>> Good luck, Steve KW3A
>>
>> On 7/18/2013 3:11 PM, Fred Adams wrote:
>>> Are any of you guys running the 6 thru 80 meter windom antenna? If
>>> so, I would appreciate some info on this antenna. How long are the
>>> legs and best height for average use? Any good or bad things that
>>> you have to say about the antenna. I recently heard a guy talking on
>>> a windom and he had a very good signal barefooted and this got me
>>> interested. First, I have to know the length so I can find if I have
>>> the
>> space. I will appreciate any info
>>> good or bad. Thanks much,
>>>
>>>
>>>
>>
>>
>>
>
>
>
|