The Survival Podcast Forum

Survivalism & Self Sufficiency Topics => The HAM Radio Board => Amateur Radio How-To's => Topic started by: Greekman on August 17, 2015, 01:00:03 AM

Title: Active HF receiving antenna
Post by: Greekman on August 17, 2015, 01:00:03 AM
found this elsewhere.
I wonder if it is as good as the guy claims
http://www.chirio.com/mini_whip_e.htm
Title: Re: Active HF receiving antenna
Post by: Carl on August 17, 2015, 06:37:14 AM
Active antennas do BOOST receive signals strength and this allows you to hear great stations with a small antenna...but the also amplify NOISE and this is not so good...a proper antenna can be had with just a bit more wire and though wire is not as pretty as a short PVC stick...you will discover that as far as antennas go...size does matter and a few dollars worth of wire still beats $500 worth of aluminum (HF Vertical) or a handful of components that give you more noise to contend with.

Bottom line: Does it work?  YES
Does it give more signal?   YES,with more noise
Will you be happy with the results?   YES,until you compare to a proper size antenna made from wire
Is it a good project to learn electronics?  YES , but the only advantage is performance vs size and a full size antenna with easily out perform amplified signal and noise from a small antenna,

Wouldn't it make sense to build this in to PREMIUM RADIO RECEIVERS if it really offered a performance gain? BUT NO they offer attenuators to help block out some of the noise instead.This is why we have RF GAIN control...to turn DOWN the noise.

Let me know how this works out for you...

Because maybe my opinion is a load  of manure.....
Title: Re: Active HF receiving antenna
Post by: Greekman on August 17, 2015, 07:17:18 AM
I will admit I had forgotten about amplifying the noise too.

I was enticed to the design beacause my HT also receives HF..with no filters etc though
Title: Re: Active HF receiving antenna
Post by: Carl on August 17, 2015, 07:53:01 AM
I will admit I had forgotten about amplifying the noise too.

I was enticed to the design beacause my HT also receives HF..with no filters etc though

Get a connector and attach 30 feet of wire to go to the center pin of the connector,save $$$ and your talkie
will receive commercial broadcast on short wave as good as a pocket short wave radio. OR get one of the
TECSUN PL 360 and get a AM/FM/Short Wave  clock radio with thermometer and rechargeable batteries for
a better receiver with much longer battery life and power versatility..

http://www.amazon.com/Tecsun-PL-360-Digital-Portable-Shortwave/dp/B004QJKO52
Title: Re: Active HF receiving antenna
Post by: Greekman on August 17, 2015, 12:02:27 PM
but i won't be hand carriable...lol and one more antenna will not hurt.
BTW i do have made me a random wire receiving antenna at 73 feet IIRC