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31  eHam Forums / QRP / RE: 10 Meter antenna for hiking on: February 07, 2012, 05:38:17 AM
This one looks interesting:

http://www.kd5fx.com/FXportable/fx_portable_antenna.htm

Works on 6 meters through 20 meters.  He has photos showing it set up for use on 10 meters and 20 meters with radials cut for 20 meters.  You could go with shorter radials for portable operation on 10 meters.  MFJ also sells a shorter telescopic whip (MFJ-1977) that would work on 6 meters through 15 meters.
32  eHam Forums / CW / RE: Newbie to Hamfest on: February 05, 2012, 04:27:10 PM
Quote
Welcome back Brian, and I sure hope to hear you 40 meters.
I am a recent come-back also, and am always looking
for someone sending code slowly.

Getting back into amateur radio myself.  Own a house in a "no external antennas" neighborhood, so I'm learning CW and experimenting with an indoor magnetic loop on 40 meters.  Wink  Hope to hear you both on 7.114 some evening!

http://www.skccgroup.com/opfreq.php
33  eHam Forums / Licensing / RE: Hope this is not redundant, but... on: February 04, 2012, 01:58:56 PM
Don't know who Gordo is, but I did it myself here and here.
34  eHam Forums / Mobile Ham / RE: Will Illinois be the first State to Ban Ham Radio while Driving? on: February 02, 2012, 08:02:06 AM
Cell phone users are the problem.  Especially cell phone users in urban areas.

Radio operators are not the problem.  Especially radio operators in rural areas.
35  eHam Forums / Mobile Ham / RE: Will Illinois be the first State to Ban Ham Radio while Driving? on: February 01, 2012, 08:07:29 AM
That will go over like a lead balloon with the trucking industry.
36  eHam Forums / Elmers / RE: Wouxux how to calculate offsets on: January 31, 2012, 03:30:34 PM
Looks like you have quite a few repeaters in your area.  Put your callsign into the QTH search or your ZIP code into the Geo search:

http://k5ehx.net/repeaters/qrepeater.php
37  eHam Forums / VHF / UHF / RE: Repeaters for USVI and PR? on: January 26, 2012, 08:25:36 PM
Plug PR or VI into the State Search box:

http://k5ehx.net/repeaters/qrepeater.php
38  eHam Forums / Elmers / RE: MFJ 259-B ok to analyse multibad vertical & 450 Ohm fed doublets? on: January 26, 2012, 11:21:44 AM
Quote
I also modeled a 10m-double extended Zep fed with 450 Ohm window line, for multi band use 20m-10m. Modeling the doublet and getting the Z's is OK but I don't seem to find good feed line length with average impedances to tune easily.
See pages 4-5 of the following:

http://www.dxengineering.com/pdf/WA-Multi-Band%20DipolesRev2.pdf

Quote
will I be able to connect the vertical's radiator and the elevated radials to it &how should I do that - the MFJ has coaxial connector?
I guess you would connect the SO-239's center pin to the vertical's radiator and the SO-239's shield to the radials.

Quote
how can I measure at the input of the 450 Ohm parallel feed line int the shack for the doublet antenna?
"Use the ANTENNA connector’s shield for one lead and its center pin for the other."

http://www.mfjenterprises.com/pdffiles/MFJ-259B.pdf

I hope this helps.  I recently acquired one of these but I haven't tried what you want to do yet.
39  eHam Forums / Antennas and Towers and more / RE: Parallel Dipole (fan) fed with twin lead vs. 80m doublet on: January 19, 2012, 03:43:20 PM
Quote
The doublet was cut down to 100ft because having it at the classice 135ft made it way too tough to use with my tuner on 40m and some other bands.

How long is your feedline?  Here is DX Engineering's recommendation:

"The feedline must be in odd multiple lengths of 1/8-wavelength on the lowest operating frequency to optimize the impedance presented to the balun over the frequency range of the antenna. This length can be calculated using the following formula, or use Table 1. The DX Engineering 300 Ω ladder feedline has a VF of 0.88."

http://www.dxengineering.com/pdf/WA-Multi-Band%20DipolesRev2.pdf
40  eHam Forums / HomeBrew / RE: Weather band receiver kit? on: January 19, 2012, 05:41:46 AM
You could use a receive converter if your HF rig does FM on 10 meters.  The Hamtronics unit looks like it could be moved up to 162 MHz.
41  eHam Forums / HomeBrew / RE: Weather band receiver kit? on: January 09, 2012, 06:09:14 AM
The closest thing I've found is a Vectronics VEC-1012K (which should be retunable for 162.xxx?).  It looks like the VEC-1002K is the same radio with different tuning.  The PCB is 3.3" x 3.0", I wonder if a smaller PCB could be made?
42  eHam Forums / Antenna Restrictions / RE: Shorty Forty v Active antenna on: January 02, 2012, 07:44:07 AM
It looks like you're on the second floor of a three story condo.  Can you hear signals when you touch 30 feet (or thereabouts) of wire to the center conductor of your antenna jack?  The good news is, if signals are getting in, they should get out as well.  The bad news is, if signals aren't getting in, ...

Happy New Year and congrats on the new license by the way!
43  eHam Forums / Antennas and Towers and more / RE: Need indoor/portable antenna suggestions. on: December 26, 2011, 07:51:15 AM
Look into a magnetic loop for indoors.  The MFJ-933 and MFJ-935B tuners use an MFJ-19 capacitor while the MFJ-936B tuner uses an MFJ-23 capacitor.  I would run QRP indoors though.   Smiley

http://www.mfjenterprises.com/antennatalk6.php
44  eHam Forums / Elmers / RE: 180 mile Non-Repeater Communication for Camping on: December 13, 2011, 07:26:44 PM
This may be relevant to your interests:  Everyday VHF, UHF, and SHF propagation
45  eHam Forums / Antennas and Towers and more / RE: 'Magentic' Loops - what's so hard about clear instructions? on: December 13, 2011, 07:12:12 PM
For the upper HF bands, you could use the MFJ-19 butterfly capacitor (used by the MFJ-933 and 935B tuners).

I recently built an indoor loop for 30 and 40 meters.  Constructed from 4" aluminum flashing, it's 6 feet wide by 7 feet tall.  My MFJ-936B (containing a MFJ-23) tunes it on 40 meters.  I hope to try it on 30 meters soon.

It's interesting to switch between copper and aluminum when modeling loops in MMANA:  the practical difference appears to be less than you might think.  I'm interested in trying 5/8" aluminum fuel line as a loop conductor now.
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