[TowerTalk] Pattern Innovantennas 7el 6 M LFA2 WOZ Yagi

[Doug Turnbull]

Friends, 
      I have just now changed from a 6 el 6M quad to 7 el LAF2 WOZ Yagi by Innovantennas    These are my findings so far.    As you will see to the end I make some sweeping statements about Yagi vs quad.    I may be wrong but they are my observations for this situation.    I hope this is not off topic and that the ranting of a geezer does not annoy.    It is not my intent and hopefully no such thing occurs.

 

      Thank you for the bandwidth.

 

                             73 Doug EI2CN

 

From: turnbull <turnbull at net1.ie> 
Sent: Sunday 3 April 2022 15:24
To: Doug Turnbull <turnbull at net1.ie>
Subject: 7 el Pattern

 

Dear Friends,

 

 

These measurements are difficult and are carried out on a solid CW  carrier from EI0SIX at 50.004 MHz.   You must allow for a 0.5 lsb error or perhaps I might say +|- 1.5 dB, a quarter S unit.

Pk sig Az 153  -92.5 dB
2.5 dB Az 116 -95 dB
2.5 dB Az 170 ‐95 dB
5 to 6 dB Fwd lobe W 54
degrees approx

Turn Yagi 180 degrees
153  + 180 = 333 degree

@ Az 333 pk sig -116.5 dB

Thus FB ~ 24 dB

Front to Side
333 - 90 = 243 degrees
Az 243     pk sig = -130 dB
Thus FS ~ -37.5 dB

Now these measurements as previously stated have  tolerances.    Furthermore they may differ from the computer model negatively because of proximity of the house and terrain.

I am certain the pattern is tighter than that which I had with the 6 element quad.   Furthermore I bet the quad is no better at rejecting noise in general and in particular from my neighbours PV panels.   I expect no improvement in forward gain which would be noticeable. 

Previously I ran JA on six from EI like a madman perhaps 45  in 90 minutes.   I saw no difference on average with the two big GD stations.   We each rivaled the other more or less equally.   The quad performed very well but was not noticeably different from the performance of 'long john' Yagis.

I purchased the Yagi specifically to reduce EMI from a PV system.   

The Yagi is infinetly easier to tune as well.   In my case no tuning proved necessary.

For me the case is closed.   I agree a two element Yagi is the equal of a three element Yagi and probably superior at rejecting noise.   How much better in numeric terms, I have never seen presented.   Without numbers we are lost.

If this is confrontational well I was sensitized to claims made for the quad.    I a heard these claims since 1960 but hams overwhelmingly use Yagis.   There are reasons.   Perhaps the full loop on the LFA Yagi for a driver and the modified director largely eliminate the quad advantage at noise rejection?

Please forgive typos and lack of editing this is hell on a phone

73 Doug EI2CN

Sent from my Galaxy