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Call Sign : 26-CT-3971 / M7TDV Posts : 733 Times Thanked : 40 Join date : 2021-01-30 QTH or Location : Cirencester, Gloucestershire Equipment Used : Little radios, home-made antennas
Subject: Re: Procomm P99 Sat May 21, 2022 9:38 pm
Hi Andy. I haven't used one, so would be wrong for me to voice much of an opinion. Others here have used though. HERE's one thread on it if by chance you haven't spotted it.
I believe it to be an end fed half wave, and being so the length of pole it is mounted on should make very little difference to how it performs.. except of course that a longer pole getting it higher will almost certainly help. I will stand corrected though if others who have experience using say otherwise.
Call Sign : 2-CT-210 Posts : 30 Times Thanked : 6 Join date : 2022-01-01 QTH or Location : Lexington, Kentucky Equipment Used : Alinco DX-SR8
Subject: Re: Procomm P99 Wed May 25, 2022 4:01 pm
Andy & All, Usually, a ground plane is perpendicular-ish to the vertical element. The tower would have minimal effect as a ground plane. I am assuming you have mounted your Sigma dipole also in a vertical position. The only real difference between these two antennas is the location of the feed point. Performance between the two should be similar. I don't think the P99 would be an 'up-grade' unless you added a ground plane to it. Either as the add-on kit or adding your own DIY bit of kit. 2CT210
Call Sign : 2-CT-224 Posts : 5 Times Thanked : 0 Join date : 2022-08-18 QTH or Location : Mound, MN Equipment Used : Galaxy 959, President McKinley 2, Procomm PT99 Age : 60
Subject: Re: Procomm P99 Mon Aug 29, 2022 9:16 pm
I've owned a Procomm PT99 the past year and have had it up on 2 different steel pipe masts. The first being about 25 feet long and off the ground, the second recently about 8 feet long mounted on the roof. Neither mast has made any difference at all in tuning, so the mast makes no difference and does not act as a ground plane. There is a ground plane kit for this antenna. Procomm and others (Walcott Radio here in the US) claim a 30% improvement in performance as the ground plane kit is supposed to lower the angle of radiation. I am using the recommended ground plane kit and it seems to work better using it vs. not using it. Overall the antenna is very easy to tune, is light weight, and does not require anything real heavy duty to mount it.