[Lowfer] Antenna environment changes

[N1BUG]

That agrees with my experience. In the spring I hung a 80m inverted
V from one of the towers which support the T LF/MF antenna. This
caused resonance on LF to move down. I had to change a tap on the
big coil to get it back within range that the small variometer could
tune. I needed less inductance which tells me I had added
capacitance. The R component did not change so I reasoned that by
calculation, EIRP hadn't changed (what happens in the far field I
don't know). It doesn't seem to have harmed my radiation much. My LF
WSPR2 signal has been decoded in Europe several times this summer.

That experience didn't surprise me since I was putting wire very
close to the LF/MF antenna top hat. Yesterday's experience did come
as a surprise. The aluminum tube was very low and not close to the
LF antenna. But as IK1HSS put it ...a wingbeat of a butterfly...

Paul



On 09/05/2018 01:06 AM, William E. Isakson wrote:
> Steve, Don't get rid of your new antenna.   What you did to the LF antenna
> by putting in the new one was to add capacitance, so now subtract a little
> of the inductance from the LF and it will be fine.
> --------
> 
> 
> Bill Isakson     AC6QV
> Roseburg, Oregon USA
> bill.isakson at gmail.com
> 
> 
> 
> 
> On Tue, Sep 4, 2018 at 9:58 PM Steve <ve7sl at shaw.ca> wrote:
> 
>> Just experienced something similar here after erecting a full-size 80m
>> inverted-V dipole and 40m one on the same feedline...way high at ~90 but
>> legs and feedline very close to my LF/MF inverted-L. Noted my resonance
>> moved from 475-ish to 465!! I have no idea what detrimental effects it may
>> be having on my radiation / erp but suspect that it can't be good. I may
>> have to remove the new antennas.
>>
>> Steve
>>
>>
>> WEB - "The VE7SL Radio Notebook": http://qsl.net/ve7sl/
>>
>> VE7SL BLOG - "Homebrewing and Operating Adventures From 2200m to
>> Nanowaves":
>> http://ve7sl.blogspot.ca/