A look at the PA0RDT mini-whip HF compact active antenna

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A look at the PA0RDT mini-whip HF compact active antenna

Postby radiostationx » Sun Aug 05, 2018 2:17 pm

Purchased last year, I have done a small write up on this quirky active antenna for HF.

Enjoy the read.

http://www.merseyradar.co.uk/?p=316
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Re: A look at the PA0RDT mini-whip HF compact active antenna

Postby m0lsx » Sun Aug 05, 2018 3:43 pm

How did you connect this to your 606? As the 606 from what I remember is not really designed for external antennas beyond a wire soldered to a jack plug.
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Re: A look at the PA0RDT mini-whip HF compact active antenna

Postby radiostationx » Sun Aug 05, 2018 5:06 pm

Here we go, connection for the PL-600 or 660 as its the same 3.5 mono I think..
Forgive the very short piece of Webro UF100 coaxial used to join up the whip here for demo, the real one is much longer..perhaps too long.

I have used a mono jack for the Tecsun antenna input end (decided on a decent quality metal one and it just so happened i had the very thing in the parts box ,from decades ago probably !) and an F connector to BNC for both the antenna injector box terminations, they are easy fitted and I can swap "on the fly" to mcx for the r820t dongle direct or sma to the spyverter via adaptors and patch leads which I have plenty of. Connection to the whip in the demo photo is via f connector/pl259 male adaptor.

The 12v is supplied from a standard wall wart thingy, or the shack psu depending on where I want the tecsun /r820 at the time.


Image

By design there isnt any voltage on the receiver side of the power injector. But If you want to be extra sure that no voltage goes into the rx, you can install a dc blocking capacitor in the patch lead on the receiver side.
If you are using f connectors thats easy as dc blockers are widely available, its nothing special just a capacitor but they look the part.
Triax are a pretty well known brand, you can find these on ebay/amazon and a local tv/sat supplier easy enough.

http://www.triax.uk/products/satellite/ ... e-dc-block

As ever, any item in the chain will have some factor of insertion loss and a dc blocker device is no exception.

I have used long wire dipoles, inverted Ls and all sorts of rough and ready experimental antenna rigs made out of stripped down cat 5 network cable with the Tecsun PL-600, its a great performer for the cash.
One of The 8 cores of a network cable can be very handy to make antennas for travelling, its very light and easy to manage ,say 10mtrs is a good start, just put on a mono jack and wrap it all on little diy bobbin and string it out around your room or in a tree for that matter when needed. Put away in 2 minutes flat.
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Re: A look at the PA0RDT mini-whip HF compact active antenna

Postby m0lsx » Sun Aug 05, 2018 6:02 pm

radiostationx wrote: By design there isnt any voltage on the receiver side of the power injector. But If you want to be extra sure that no voltage goes into the rx, you can install a dc blocking capacitor in the patch lead on the receiver side.


The cheapest & simplest DC blocker is a capacitor. They make an excellent addition to put on the black wire side of a mobile radio, as they are dirt cheap, easy to put in place/ replace & they stop damage from happening if you ever accidentally reverse the polarity.
Also I know of two two people who have lost radios whilst starting their vehicles.
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Re: A look at the PA0RDT mini-whip HF compact active antenna

Postby jonboy1081 » Tue Aug 07, 2018 10:26 pm

Great review, just ordered a similar one from the Russian guy for portable use, strangely enough I’ve been looking at the G-Whip receive antennas too for home, I have the 20 & 40m ones but want a dedicated receive a antenna.

Cheers

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