"...actually I find that M2 is right on in their numbers – no specmanship here
whatsoever."
Then look here at the on-line M2 spec for their 12L LPDA model:
"Gain 6.8 dBi / 11.6 dBi @ 45' "
The gain is really 11.6 dBi at 45 ft. across the entire 30-10m spectrum? I can
see using one figure in free space, but not over earth.
Any manufacturer that implies gain at a specific height above ground, is using
"specmanship." At the very least, manufacturers should state: "modeled x.x MHz
at xx ft./m in height over flat earth. Changes in the surrounding terrain will
affect this specification." Also see Optibeam's advertising material for
similar height/gain claims.
Paul, W9AC
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
StellarCAT
Sent: Tuesday, April 7, 2015 10:18 AM
To: tower
Subject: Re: [TowerTalk] Antenna choices
At the very bottom of the page for Original Tennadynne products is this
statement:
" *These gain figures are fictitious, but since other antenna manufacturers
tend to use them to manipulate things in their favor by enhancing their
specifications with phony data, we've added them so that you can get accurate
comparisons. "
73 K9WN Jake
...actually I find that M2 is right on in their numbers – no specmanship here
whatsoever. Also Optibeam and Innovantennas all use actual numbers from real
modeling! I asked the owner of Tennadyne to provide actual modeled numbers –
his reply was to send an anecdotal note from a user glowing about how well it
performed – to which I replied “you can find this type of report for TA33’s...
real hard data from modeling is what I need to know for comparison”... he
declined to provide it and wished me well. Nice enough guy – but no hard data
to back it up.
Gary
K9RX
_______________________________________________
_______________________________________________
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
|