NASA HF ACTIVE ANTENNA

A place to discuss the HF and Shortwave listening side of the radio hobby. Discuss equipment, frequencies and antenna systems etc. Anything HF!
gerald123
Super Member
Super Member
Posts: 363
Joined: 12 Feb 2009, 00:05

NASA HF ACTIVE ANTENNA

Post by gerald123 » 30 Jan 2018, 21:53

hi i am thinking of getting the ....nasa hf active antenna .has any one used them and are they any good for the ameture bands and air bands on hf...

User avatar
ch25
Super Member
Super Member
Posts: 446
Joined: 03 Dec 2016, 11:07
Call Sign: n0call
Location: Poland

Re: NASA HF ACTIVE ANTENNA

Post by ch25 » 30 Jan 2018, 22:13

Link?
You can't have too many antennas...

gerald123
Super Member
Super Member
Posts: 363
Joined: 12 Feb 2009, 00:05

Re: NASA HF ACTIVE ANTENNA

Post by gerald123 » 30 Jan 2018, 22:26


gerald123
Super Member
Super Member
Posts: 363
Joined: 12 Feb 2009, 00:05

Re: NASA HF ACTIVE ANTENNA

Post by gerald123 » 30 Jan 2018, 23:05


User avatar
ch25
Super Member
Super Member
Posts: 446
Joined: 03 Dec 2016, 11:07
Call Sign: n0call
Location: Poland

Re: NASA HF ACTIVE ANTENNA

Post by ch25 » 31 Jan 2018, 08:10

I was using miniwhip active antenna, performing well. This antenna seem to be similar.
Do not forget, that you gonna need power adaptor.
Chris
You can't have too many antennas...

gerald123
Super Member
Super Member
Posts: 363
Joined: 12 Feb 2009, 00:05

Re: NASA HF ACTIVE ANTENNA

Post by gerald123 » 31 Jan 2018, 15:15

ch25 wrote:
31 Jan 2018, 08:10
I was using miniwhip active antenna, performing well. This antenna seem to be similar.
Do not forget, that you gonna need power adaptor.
Chris
just orderd this one..a bit cheaper...

http://www.ebay.co.uk/itm/Mini-Whip-HF- ... 1438.l2649

User avatar
ch25
Super Member
Super Member
Posts: 446
Joined: 03 Dec 2016, 11:07
Call Sign: n0call
Location: Poland

Re: NASA HF ACTIVE ANTENNA

Post by ch25 » 31 Jan 2018, 15:18

Good choice.
Chris
You can't have too many antennas...

gerald123
Super Member
Super Member
Posts: 363
Joined: 12 Feb 2009, 00:05

Re: NASA HF ACTIVE ANTENNA

Post by gerald123 » 31 Jan 2018, 15:43

ch25 wrote:
31 Jan 2018, 15:18
Good choice.
Chris
thanks for the replies ....will let you know how i get on with it.

User avatar
kilimax
Veteran
Veteran
Posts: 2697
Joined: 05 May 2014, 09:18
Call Sign: GM0BRJ
Location: Same Country as Buick Mackane

Re: NASA HF ACTIVE ANTENNA

Post by kilimax » 31 Jan 2018, 19:32

gerald123 wrote:
31 Jan 2018, 15:43
ch25 wrote:
31 Jan 2018, 15:18
Good choice.
Chris
thanks for the replies ....will let you know how i get on with it.
I have the very same active aerial and it does work well. My main RX aeral is a Wellbrook ALA1530S+ Imperium loop. It's a superb aerial and I have to say the miniwhip while not as good, is a decent performer. Factor in the price and you have a bit of a bargain.

A few tips for you.
Try and get the aerial as far away from the house as possible to reduce any hash.
Ensure you make the coax connection waterproof as any water ingress will be fatal for the amplifier
Double check that you have breathing holes to prevent moisture from building up :thumbup:
Kilimax - Drew
Amateur Callsign GM0BRJ
Tango Mike Callsign 108TM144

I've changed radios that many times, I've forgotten what I have :think:

User avatar
ch25
Super Member
Super Member
Posts: 446
Joined: 03 Dec 2016, 11:07
Call Sign: n0call
Location: Poland

Re: NASA HF ACTIVE ANTENNA

Post by ch25 » 31 Jan 2018, 20:34

My advice: use ferrite clamp-on cores right under antenna and before coax entrance your house. 10-15 each side. It will help a lot to reduce coax acting as antenna and bringing all the noise to your rx.
Or better 2x choke balun on FT240-43 core winded 2x 9 turns. http://www.m0pzt.com/choke_balun.png
You can cut 10dB of noise. I recommend to read and apply: http://active-antenna.eu/tech-docs/comm ... ftp-10.pdf
Use good, double shielded coax, quality CATV 75Ohm is very for for that.
Chris
You can't have too many antennas...

User avatar
Admiral
Legend
Legend
Posts: 10000
Joined: 08 Mar 2011, 21:20
Call Sign: 26TM157
Location: MK-UK

Re: NASA HF ACTIVE ANTENNA

Post by Admiral » 01 Feb 2018, 10:52

I have found with my PA0RDT active antenna that I get better performance and better signal to noise by mounting it on a non-metalic pole. I have mine on a bamboo pole, I am guessing the fishing type poles would be good too.
Winner of the 2017 IBTL 'Summer Sizzler' competition

gerald123
Super Member
Super Member
Posts: 363
Joined: 12 Feb 2009, 00:05

Re: NASA HF ACTIVE ANTENNA

Post by gerald123 » 16 Feb 2018, 12:19

ch25 wrote:
31 Jan 2018, 08:10
I was using miniwhip active antenna, performing well. This antenna seem to be similar.
Do not forget, that you gonna need power adaptor.
Chris
hi .i have now got the antenna..i have heard that it would be a better idea to use a 12v battery if so what amp should it be ......also would any 12 v power suply should i use...

User avatar
owza
Super Member
Super Member
Posts: 327
Joined: 16 May 2011, 10:26
Call Sign: 2E0
Location: NW, UK

Re: NASA HF ACTIVE ANTENNA

Post by owza » 16 Feb 2018, 14:47

Whatever you do, watch out it doesn't have any reverse voltage protection. I damaged mine whilst it was on the chimney stack! :lolno: (edit, If we are still talking about the NASA?)

gerald123
Super Member
Super Member
Posts: 363
Joined: 12 Feb 2009, 00:05

Re: NASA HF ACTIVE ANTENNA

Post by gerald123 » 16 Feb 2018, 15:12

owza wrote:
16 Feb 2018, 14:47
Whatever you do, watch out it doesn't have any reverse voltage protection. I damaged mine whilst it was on the chimney stack! :lolno: (edit, If we are still talking about the NASA?)
i got this one insted..but same aplies.....

http://www.ebay.co.uk/itm/Mini-Whip-HF- ... 2749.l2649

gerald123
Super Member
Super Member
Posts: 363
Joined: 12 Feb 2009, 00:05

Re: NASA HF ACTIVE ANTENNA

Post by gerald123 » 16 Feb 2018, 15:15

gerald123 wrote:
16 Feb 2018, 15:12
owza wrote:
16 Feb 2018, 14:47
Whatever you do, watch out it doesn't have any reverse voltage protection. I damaged mine whilst it was on the chimney stack! :lolno: (edit, If we are still talking about the NASA?)
i got this one insted..but same aplies.....

http://www.ebay.co.uk/itm/Mini-Whip-HF- ... 2749.l2649
i am thinking of hanging it outside bedroom window .....to try it i have not got a garden.i know it should be further away from house ...

Post Reply

Who is online

Users browsing this forum: No registered users and 5 guests