Correct. I thought you were only using nitrogen for the 30' piece but
apparently you need it at the antenna or somewhere else in your system.
GL with this project!
John KK9A
Sent via the Samsung Galaxy 7 edge, an AT&T 4G LTE smartphone.
On Tue, Jun 12, 2018 at 11:31 PM, Doug Ronald <doug@dougronald.com> wrote:
But neither of those appears to pass the nitrogen. I would have to string a
> separate hose just for that...
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> john@kk9a.com
> Sent: Tuesday, June 12, 2018 07:48 PM
> To: towertalk@contesting.com
> Subject: [TowerTalk] Connector on 7/8 Heliax
>
> For only 30' I would use FSJ4 or LDF4 with an EIA on one end and a DIN on
> the other. These cables are easy to work with (and ship) and there is
> really no additional loss compared to 7/8 for this length and frequency.
> If
> you have trouble finding a cable assembly like this, please contact me
> directly.
>
> John KK9A
>
>
> Tue Jun 12 19:50:27 EDT 2018
> Previous message (by thread): [TowerTalk] Connector on 7/8 Heliax
>
> Air because the antenna's 1 5/8 EIA transmission line is pressurized. I
> already have the nitrogen setup for that outdoors at the antenna's base,
> but
> I can put the tank inside where it belongs if I have pressurized helix as
> well.
>
> Actually if I buy a ready-made cable, I'll have a 1 5/8 EIA flange on one
> end, and a 7/16 DIN into the shack on the other. Then I can get rid of the
> EIA-to-N adapter at the antenna base.
>
> We're just talking HF. The antenna is rated 3 -- 30 MHz. I want low loss
> transmission line to maintain my hard-fought noise figure at the upper end
> toward 30 MHz. Since I'm on solar power, I'll be lucky to even get 1500
> Watts out, but the EIA stuff is the way the antenna came, and I'm stuck
> with
> it.
>
> So you guys have any suggestions on a good place to pick for the
> transmission line? I see Commscope, maybe RFParts, Pasternack, but what
> others are out there?
>
> Thanks for responding,
> -Doug
>
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