Tom,

Final thought.   Earlier I said  the 15 meter  resonance was a third 
harmonic, I  should have said "odd multiple of the 40 meter frequency", 
which is why you multiply by 3.

73, Steve KW3A

On 10/27/2013 10:44 PM, Steve Forst wrote:
> It would be great to get someone over with an analyzer.   You can also
> do some  SWR checks across both 40 and 15 meters to see what is up.
> Tuners out of line.
>
> I think if you are resonant high up in the 40 meter band, you will be
> out of band on 15. There is a third harmonic resonance, which is why 40
> and 15 line up.   If your 40 meter dipole is resonant at 7.100,  then
> times 3 will put you at 21.300.  Right in the middle of the phone
> portion of 15.   On the other hand, if 40 meters is resonant at 7.250,
> then times 3 puts you at  21.750, (out of band).
>
> If this is the problem, you may have to tinker/compromise on 40 meter
> resonance to get 15 meters in band.
>
> This is a popular antenna.   I would wonder what Alpha Delta says about
> 15 meter performance.    I would probably do SWR plots and get the
> analyzer info  before contacting them.
>
> 73 Steve  KW3A
>
> On 10/27/2013 10:11 PM, Tom Behler wrote:
>> Steve:
>>
>> I guess that's what confuses me a bit with the 15-meter portion of my Alpha
>> Delta DXCC.
>>
>> The thing works so well on 40, that you would think it should perform well
>> on 15 meters too, especially if it uses the 40 meter part of the antenna to
>> tune on 15.
>>
>> A good friend of mine has an MFJ antenna analyzer, so I may ask him to come
>> over here and see where the antenna actually resonates on 15 meters.
>>
>> That hopefully should tell me something.
>>
>> Tom Behler: KB8TYJ
>>
>> ----- Original Message -----
>> From: "Steve Forst" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Sunday, October 27, 2013 10:04 PM
>> Subject: Re: 10 and 15 meters continued
>>
>>
>>> Tom,
>>>
>>> Sounds like you had fun.  Svalbard is  between the Top of Norway and the
>>> North Pole.   It belongs to Norway, but is far enough away so it counts
>>> as a separate DXCC country.   I don't see them very often, but did work
>>> them  a few weeks ago in the WAE SSB contest.
>>>
>>> I did a little bit of S and P this weekend, mostly on Saturday.   A
>>> number of JA's on 10 and 15, Guam and Ascension island on 15, and  2
>>> from Kazakhstan and also the persian Gulf  on 10 meters in the morning.
>>>     Didn't hear anything on 160, but the higher bands were so good, it
>>> didn't matter.
>>>
>>> As for your antenna on 15 meters:  If I'm not mistaken, it's full size
>>> on 40, loaded for 75/80, and has 2 parallel dipoles for 10 and 20
>>> meters.   I think the idea is that since 40 and 15 meter bands are
>>> harmonically related,  there is no "real" 15 meter section, and so you
>>> tune   the 40 meter part on 15.
>>>
>>> If the performance is that poor, maybe you can rig up a  single band 15
>>> meter dipole somewhere.
>>>
>>> 73, Steve  KW3A
>>>
>>>
>>> On 10/27/2013 9:29 PM, Tom Behler wrote:
>>>> Hi, again, all.
>>>>
>>>> Most of the contacts I mentioned were on 10 and 20 meters.
>>>>
>>>> For some reason, which I'm going to have to investigate, my DXCC tunes,
>>>> but
>>>> doesn't seem to get out quite as well as I think it should on 15 meters.
>>>>
>>>> Tom Behler: KB8TYJ
>>>>
>>>>
>>>>
>>>
>>
>>
>>
>
>
>