End fed antenna
The end fed antennas are full length half wave dipoles where the coax connector is at one end of the dipole, where it is most needed. The big advantage of these antennas is that can be mounted horizontally, vertically or as a sloper. No counterpoise is needed.
This antenna is very small and well built. The only weak point is in the antenna radiator which attaches to the matching network without any strain relief. That would not normally be a problem and do not think it would be an issue with normal use.
IZ0JOJ End Fed antenna installed @ my university accommodation in Bristol
Can you see it?
It is a very versatile antenna, stows-away into a very small volume, power rating of 25W and size. Bandwidth is amazing: around 200 khz. No tuner is advised to be used. The matching box that is about 1″ x 1″ x 1.5″that has a BNC connector. Weight is 3.5 ounces. My version is the 40/20/10 meters band Trail Friendly . 75$ + shipping from USA store. The construction is excellent and I have never ever had need to call the customer service but on eham.net reviews some ham radio op did have need to call the store and seems they are quick and gentle.
SWR on 10 meters band (28.250 mhz) is 1:1
SWR on 12 meters band (24.900 mhz) is 2:0
SWR on 15 meters band (21.200 mhz) is 2:7
SWR on 17 meters band (18.100 mhz) is 3:5
SWR on 20 meters band (14.150 mhz) is 1:1
SWR on 30 meters band (10.100 mhz) is 3.2
SWR on 40 meters band (7.050 mhz) is 1:2
If you travel around the globe, if you need a stealth antenna, with easy deploy …and easy transportable,
the end fed antenna is what you need. If you need a strong, reliable, with very good construction, excellent service,
you need a LNR precision end fed antenna. Very good value. On Eham it has been reviewed as 4.7 on 5.
Click down here to see a nice video about my LNR precision END FED ANTENNA and ME working in 20 meters band.
Portable operation QRP from Termoli (CB) –
Calling CQ on 15 meters band – End FED antenna by LNR precision Trail friendly (10-15-20-40 meters band)
What to say? I spent 1 hour doing QSO over all ham radio bands.
73 de IZ0JOJ
PSK31 and RTTY via wolphilink interface
Article by W4FDT
“You can do very efficient PSK31 and RTTY among other things with a device called Wolphi Link and the
droid psk app in the android play store. The device can be purchased through the wolphilink website:
It is very simple to hook up, infact it just plugs into your tablets headphone jack and the other end plugs into your data port on your radio and thats it. No software to adjust, no sound card drivers to fool with or anything like that.
Here there is a video of me using it with my current setup.
Attached is a picture of the way my setup is done and it is very convenient for me. Portable ops cannot be much easier without having to haul around a laptop etc to run digital modes, i can just use my regular cell phone!”
QRP FT 817, Elecraft KX3, ICOM 703 FORUM
A new forum dedicated to QRP FT 817, Elecraft KX3, ICOM 703 has been created.
Sections: Antenna reviews / test ; Modifications / Mods ; How to / Filter / SSB CW /
Microphones / Portable QRP antennas / Walkabout / QSO.
The forum is definitely the place where every QRPer could share his knowledge. It is free, no fees. All the ham radio amateurs are very welcome. Please join us and share with us your knowledge.
QRP FT 817, Elecraft KX3, ICOM 703 FORUM is growing up with many post on Alexloop antenna, how to build a loop magnetic antenna, or dipole as well multi band antennas. Gipsy dipoles but not only. We will discuss on china products that are coming at cheaper prices. Do not forget to register and join the forum. Mods for Elecraft KX3, Yaesu FT 817 and ICOM 703. Which is the best adds on for Elecraft KX3? Which filter for your yaesu ft 817? Is a new yaesu ft 817 coming soon? Let’s discuss on the forum.
73 de IZ0JOJ
The Russian team are planning to activate SSTV from the International Space Station (ISS) on Thursday December 18
The transmissions will be continued until Saturday December 20, 2014.
SSTV mode will be PD180 : Frequency 145.800 MHz with 3 minute off periods between transmissions. Twelve different photos will be sent during the operational period.
Start time would be around 14:20 UTC on December 18 and 12:40 UTC on December 20. The transmissions should terminate around 21:30 UTC each day.
I will be tuned on the VHF frequency with my ARROW antenna and my FT 817 🙂
I will post SSTV photos if I can receive one!
Yaesu FT-817 and Miracle Whip Antenna
The Miracle Whip was the smallest and lightest portable HF whip antenna on the market (now there is also the wonderwand antenna that is quite similar). It is a plastic box containing a PL-259 plug and a variable matching transformer (the C-VAT) topped by a 1 meter and half telescopic whip.
The antenna’s performance even without a counterpoise are great!
How to use
Very simply: while receiving, rotate the tuning knob until the signal is the strongest. You can do this while listening to noise, it doesn’t need to be another station. This will get you close. Now transmit, and watch the SWR meter on the FT-817. Click below to see the video and great results.
From indoors, I was able to do 15 (!) QSO on 17 m and 15 m band during SSB contest last month. The longest QSO was done with Sweden (from Italy!). I give this antenna a mark of 6/10. Great contacts during my summers. Specially on 15/17 and 10 meters great contacts! Good SWR . Add a long counterpoise and job is done!
The Miracle Whip works very well as a 1/4 wave on 2 meters band. Better SWR you have if you ground your FT-817 ND. Fully-extended, it makes a 3/4 wave at two metres, which has some useful gain. This whip should work as a 1/4 or 3/4 wave on 70 cm but I never managed to have an acceptable SWR using a 3/4 length. For 6 meters band I tested several times but I was able to have bad SWR.
MIRACLE Whip antenna compared with others
A few years ago on the Yahoo “HF-Pack” Group the MW was compared with a variety of other antennas in controlled conditions on an antenna test range. Its gain without a wire counterpoise was measured as 29dB below a dipole and 10dB below with one on 20m i.e. some 5 S points down using just the MW alone (i.e. poor) but only 1.5-2 S points down if a decent counterpoise or earth was used too (not at all bad).
Alternatives to the Miracle whip? The Wonder Wand antenna is manufactured in the UK – looks almost identical. It uses pre-tuned switched settings for each band and it also supports a tuneable counterpoise wire. This antenna is not as expensive (only 90£).
The Miracle Antenna Company has recently announced some new versions of their antenna including a switched version (not unlike the Wonder Wand) and one with a BNC connector rather than a whip so that wire antennas and “rubber ducks” can be used instead (The Miracle Ducker).
My opinion on Miracle Whip Antenna in the QRP world.
The Miracle Whip is an amazing short wave receiving antenna for our FT-817 ND QRP Radio. The Miracle Whip offers excellent transmit capability and it doesn’t require a battery. I strongly recommend this whip if you need a cheap, tiny, portable, walkabout antenna mainly for receiving and then for quick contacts not very far away where you are. The best performance in my humble opinion are in CW and higher band (17/15 and 10 meters band) with a counterpoise.
Click below to see video about results of FT 817 and Miracle whip