[UK-CONTEST] CQWW SSB 10m SO Unassisted : G3ZQH

[Clive GM3POI]

Forget about minor differences in alleged gain of the different antennas, and think in terms on Wave angle required at the wanted frequency. For example 10m is roughly half the angle of that required at 20m typically often below 5 degrees. This is the only real DX performance to worry about, fractions of a db are meaningless. Far better to have a 2el 10m yagi at 70ft than a 6el at 30ft.
73 Clive GM3POI 

-----Original Message-----
From: UK-Contest [mailto:uk-contest-bounces at contesting.com] On Behalf Of G3ZQH
Sent: 30 October 2012 07:52
To: uk-contest at contesting.com
Subject: Re: [UK-CONTEST] CQWW SSB 10m SO Unassisted : G3ZQH

Thanks for info on hexbeam vs Yagi.  Interesting that the noise level was lower with the Yagi- possibly as a result of the higher angle lobe that appears on the hexbeam at around 50’ height.

I have pasted in a table I put together a couple of years ago when I was looking for best value for a 5-band directional antenna. It is interesting to see that with these inevitably compromised antennas there is generally fairly poor performance on 10m particularly F/B ratio. The SteppIR in 2- or 3-el format is actually worse than the hexbeam on 10m F/B!

 
 
SteppIR 3 el
SteppIR 2 el
Optibeam 10-5
G3TXQ hex
Spiderbeam
Max. Element length (m)
10.97
10.97
7,70
6.6
10
Boomlength (m)
4.9
1.44
3.75
6.6
10
Turning Radius (m)
6
5.61
4.3
3.3
5
Weight (kg)
19
13.6
14
10
11.5
Windload (sq ft)
6.1
4.0
3,2
6.0
3.8
Gain dBd 20
4.9
4.2
4.2
3.8
4.5
Gain dBd 17
5.5
4.2
4.4
3.2
3.2
Gain dBd 15
5.7
4.1
4.2
3.5
4.7
Gain dBd 12
6.2
4.0
4.4
3.0
3.0
Gain dBd 10
6.3
3.8
4.8
3.6
4.9
F-to-B dB 20
21
18
22
22
15
F-to-B dB 17
20
19
17
19
20
F-to-B dB 15
27
13.7
15
16
20
F-to-B dB 12
21
13
15
13
10
F-to-B dB 10
11
9.3
20
16
18
Price £
1500
1100
1000
500
450
 

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