Re: [IRCA] KAZ Antenna Query and two TA Unids

[neilkaz <neilkaz@xxxxxxxxxxxxx>]

Hmmm...those dimensions should give you some decent nulls all across the BCB band. Very weird that you get great LW nulls but poor at high freqs from a KAZ that size.

I'd start by debugging your variable resistance control by replacing it with a fixed resistor. If that results in the same, then perhaps your xfmr is the problem and you could replace with your homemade own.  73 KAZ


-----Original Message-----
>From: Alan <alan@xxxxxxxxxxxxxxx>
>Sent: Oct 27, 2011 3:40 PM
>To: irca@xxxxxxxxxxxxxxxx
>Subject: Re: [IRCA] KAZ Antenna Query and two TA Unids
>
>Neil,
>
>Thanks for taking the time to answer my query (and who better to answer 
>it), and the offer to model it.
>
>When I said I re-erected the KAZ, I should have stated that I made this 
>one quite a bit smaller than the first one.
>Current dimensions, are 55' baseline 5' above very wet ground and the 
>apex is 23' above the baseline.
>The Ocean is just less than a 1/4 mile away in the same direction as the 
>feed-point (280 degrees)
>The null is non existent on the upper freqs.
>
>
>Alan
>
>On 27/10/2011 17:56, neilkaz wrote:
>> I you could give me the exact dimensions I can model this. 140ft is quite large for BCB and I'd expect some possible pattern degradation for the upper BCB. What is the apex height and approximately how far above ground is the 140 ft base wire?
>>
>> However, it is concerning that your nulls are great on LW, but poor on lower BCB. How are they on the upper BCB?
>>
>> You may wish to try to debug your setup with a fixed resistor and if you suspect any issues with the Mini-Circuits balun, use that home brew.
>>
>> 73 KAZ
>
>_______________________________________________
>IRCA mailing list
>IRCA@xxxxxxxxxxxxxxxx
>http://montreal.kotalampi.com/mailman/listinfo/irca
>
>Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers
>
>For more information: http://www.ircaonline.org
>
>To Post a message: irca@xxxxxxxxxxxxxxxx
>

_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx