I just bought one of these
So that gives me apart from antenna analyzer (SWR etc) Q meter L meter C meter Frequency generator to 60 MHz etc, well scroll down
What do you think?
Actually I bought it because I am planning a large 7 and 14 MHz loop antenna, like this:
BTW I found manual in English with circuit diagrams of that analyzer.
You might need a shielded loop to eliminate the noise: An unshielded and unbalanced loop isn't going to do much to reduce noise pickup (unless you have a problem where the noise is mixing with out of band signals and landing in your receiver bandpass). I suggest you consider separate antennas for TX and RX, using a shielded and balanced loop for RX. I'm going to be dealing with a similar problem, where one of the local hams managed to land in an apartment located very close to a large electrical substation.
Good luck.
-- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
On a sunny day (Wed, 06 Aug 2014 09:06:39 -0700) it happened Jeff Liebermann wrote in :
Yes, loops are cool, and there are many coupling methods,. I once designed a loop system for around 100 kHz for around a hall, for translation receivers (little radios with ferrite rod in the hall). We got permission from the English GPO to run it,
240 W altogether, 12 channels, NBFM, you would not believe the voltages you could get at the loop itself (that several hundred meters long sometimes).So there is a problem also with the small copper pipe loops in resonance, even when using a piece of coax as tuning capacitor (would flash over). I actually switched series inductors with relays, and used special fixed HV ++kV capacitors. We looped Royal Albert Hall (London) and Palace of Sports (Rome)... other places...
So I am prepared....
The alternative for very good antenna seem to be these, but have not used those:
Electric screening of the loop I have never tried, but can easily be tried with some coax.
This antenna analyzer seems like a nice thing, it is simpler than adding a DDS signal generator to my SWR meter and rewriting all soft:
Making it myself, even the box and parts adds up to more than the 76 Euro this thing is... Its hard to compete with ebay China.
On a sunny day (Wed, 06 Aug 2014 14:07:08 GMT) it happened Jan Panteltje wrote in :
It came today, fully functional, very nice thing, good as signal generator too for the meter bands..
I am also working on a high end fed antenna design, wondering if some HV MOSFETS can drive it _at_ the antenna base. Same for the magnetic loop, 2 HV MOSFETS in push pull. And the whole thing in the attic. Remote controlled. Cheap IRF 500V MOSFETS all the way to 7MHz.
On a sunny day (Wed, 06 Aug 2014 14:07:08 GMT) it happened Jan Panteltje wrote in :
The thing is very heavy!!! It turns out to be a housing of 1.4 mm steel sheet! 2 in one! The second housing is the battery compartment that has its own screw on lid for many AAA batteries.
SWR 1.0 mm But that resistor is 47 Ohm, plus .4 Ohm for the inductor....
Thing consumes about 150 mA at 12V.
I also used it to tune my 27 MHz GPA antenna, seems about right.
Would not use it as L or C meter...
On a sunny day (Wed, 06 Aug 2014 14:07:08 GMT) it happened Jan Panteltje wrote in :
So, playing and wrote soem soft. there seems to be an exel script to do this, but Phil Hobs does not like spreadsheets. So what to do? And anyways do we need that? So I coded some code.
This is fully automatic (no, actualy I needed to type enter and gnuplot) Of course you can format it anyways you like.
This is on dummy antenna (it drier inside behind the PC).
The thing is very heavy!!! It turns out to be a housing of 1.4 mm steel sheet! 2 in one! The second housing is the battery compartment that has its own screw on lid for many AAA batteries.
SWR 1.0 mm But that resistor is 47 Ohm, plus .4 Ohm for the inductor....
Thing consumes about 150 mA at 12V.
I also used it to tune my 27 MHz GPA antenna, seems about right.
Would not use it as L or C meter...
On a sunny day (Wed, 06 Aug 2014 14:07:08 GMT) it happened Jan Panteltje wrote in :
So, playing and wrote some soft. there seems to be an exel script to do this, but Phil Hobs does not like spreadsheets. So what to do? And anyways do we need that? So I coded some code.
This is fully automatic (no, actualy I needed to type enter and gnuplot) Of course you can format it anyways you like.
This is on dummy antenna (it drier inside behind the PC).
So, for those running Linux, the code to remote control the box and draw nice graphs is here:
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.