Topband: 60' or 70' spacing on Hi-Z 4/8 element RX array

[Bob Kupps]

Hi Gary
We plan to set up ours with 60' spacing for best 40m performance, and with just 10' elements.. When it is done we will be able to compare the performance on 80 and 160 with our monoband 8 circles. I agree that power gain is not important, particularly in our high QRN environment. AFAIK 70' spacing is not an option however I could be wrong. We hope to have it done before the CW test because we lost our 80m 8 circle relay box due to water damage and a replacement won't be ready in time so we should have some info for you soon...73 Bob HS0ZIA
Sent from Yahoo Mail on Android 
 
  On Wed, Nov 2, 2016 at 17:29, StellarCAT<rxdesign at ssvecnet.com> wrote:   I just purchased a HiZ 8 element array ... and am trying to decide which way I want to go. I want a bit better performance on 40 than the standard 80’ spacing provides (lobes are quite high angled) ... and going down to 70’ improves 40 a good bit – going to 60’ even more so (and improves, from an RDF standpoint, both 160 and 80!) ... I’ve modeled all conditions. I see the Total power however suffers a good bit when going down in size due to lost ‘aperture’ effect ... on 160 meters going from 80/20 (height of vertical) down to 70’/20 is a –3db loss in total power ... going to a 60’/20 is –6.6db. Lee assures me that this won’t have any real effect here unless my ... if I understand him correctly, local noise is very low – which it isn’t it turns out ... and I was wondering how others using smaller spacing, either 60’ or 70’, like the overall performance on 160 especially as well as 80? 

thanks for your time,

Gary 
K9RX

[this is not to second guess Lee, this is rather just a ‘comfort’ request ... I am still at a bit of a loss when he says it will be a loss of –6.6db going from 80 to 60 foot and yet I won’t notice the difference! Not sure what the real world implications of that are in the headphones. This will be using their new Plus6 preamps]
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