PA0RDT Antenna

Useful information regarding antennas for SDR products.
M0RON
Posts: 6
Joined: Wed Apr 03, 2019 10:18 am

PA0RDT Antenna

Postby M0RON » Mon Apr 29, 2019 1:18 pm

[quote][/quote]
Hi all,
I received my PA0RDT mini whip antenna from Roelof today, posted Friday, rapid delivery.
Looks nicely made and good quality, I'll get it up this week, fed with lmr400 coax, looking forward to seeing what results it gives.
Andy
Last edited by M0RON on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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fotoralf
Posts: 38
Joined: Wed Aug 08, 2018 10:13 pm
Location: Western Germany, near Belgian border
Contact:

Re: PA0RDT Antenna

Postby fotoralf » Mon Apr 29, 2019 6:32 pm

Got mine years ago and still happy with it. If something is good enough to receive IQ2MI in East Belgium, then it's good enough for me.

Ralf

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Mike2459
Posts: 250
Joined: Mon Jul 24, 2017 8:24 pm

Re: PA0RDT Antenna

Postby Mike2459 » Mon Apr 29, 2019 11:20 pm

I saw a significant increase in signals and a reduction in noise when the coax shield was connected to a good earth ground and an RF isolation transformer was installed. I believe the current version has the isolation transformer already installed.

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M0RON
Posts: 6
Joined: Wed Apr 03, 2019 10:18 am

Re: PA0RDT Antenna

Postby M0RON » Tue Apr 30, 2019 10:07 am

Hi Mike,
Yes, the isolation transformer is installed and has jumper to connect antenna ground to station ground, but can be taken out.
The incoming coax will be attached to a ground rod next to the house which is in turn connected to a further 4 ground rods.
73
Andy
M0RON
Last edited by M0RON on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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ON5HB
Posts: 113
Joined: Sat Dec 29, 2018 1:07 pm
Location: Heppen - Belgium
Contact:

Re: PA0RDT Antenna

Postby ON5HB » Sun May 05, 2019 10:49 am

Beware that the coax is part of the antenna but if not properly isolated from common-mode-currents it can either make it receive badly or receive a lot of electrical noise from buildings nearby.
Typical the thing is placed on a wooden stick and the coax isolated at the ground level, but as far away from buildings and electrical wires as possible.
Just giving it earth is not enough in most cases.

I myself used ferrite at 10 meters from the whip on the coax.

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Greetings,

Bas - ON5HB


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