Bitcoin donations to: 1CE9UfWJcHBYkWPns7iqBqZgKhd5xfqEaM thanks!
Buy Bitcoins easily by clicking HERE!


Use coupon radiopreppers for 20% off on the above site.

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - caulktel

Pages: 1 ... 7 8 [9] 10
121
Antennas / Re: Trapped EFHW info
« on: June 30, 2017, 01:21:09 PM »
Well my trapped EFHW was a epic failure. After getting the 20 meter section perfectly tuned with the trap on the end of the wire, I added the 40 meter section. 20 was still fine but the 40 meter section was too long and resonating at about 6.8Mhz, so I started cutting it to get it in band, well that messed up the 20 meter side, so I had to add a foot to it to get it back in tune, then 40 was out again, so I cut some more off the 40 meter side, then the whole antenna became messed up. 20 was resonate in 2 places, neither of which were in the ham bands and 40 was no longer resonate at all. It got so hot outside, I packed up and went home:-( I don't know if I want to try this again, I may just stick with mono band EFHW antennas. Bob, are you saying a 63' wire is resonate on 40 and 20 without a tuner? I have used it that way, but always needed a tuner on 20.

Joel
N6ALT

122
VHF and Above / Re: VHF SSB for Local/Regional Comms? And IC-251E...
« on: June 25, 2017, 05:20:55 PM »
Thanks Gil, I'm rather proud of my IC-251A. I'm using it with a halo antenna right now and it seems to work very good with low SWR. I also have a small 40 watt 2 meter amp, but have not had to use it yet. I'm mostly working local SSB right now. Where did you find a CTCSS board? I would have though those would be hard to find by now. I had to completely rebuild the mic, but it sounds good now and has the DTMF pad in it. Great old radio.

Joel
N6ALT

123
Antennas / Re: Trapped EFHW info
« on: June 24, 2017, 01:02:12 PM »
 Lamewolf, that's the same transformer I use on all my EFHWs. Works great on all bands.

Joel
N6ALT

124
VHF and Above / Re: VHF SSB for Local/Regional Comms? And IC-251E...
« on: June 24, 2017, 12:58:15 PM »
Hi Gil,

A Ham friend of mine gave me the US version because it didn't work. I was able to restore it back to working order. It is a great radio.

Joel
N6ALT

125
Antennas / Re: Chameleon PLOOP 2.0.
« on: June 24, 2017, 12:47:56 PM »
I built one out of copper tubing and PVC pipe and a air variable cap from Ebay. $30 total. The problem is, it's not portable and wont fit in my car, so I guess that why they get the big $$$, portability.

Joel
N6ALT

126
General Discussion / Re: QRP Night, seems like a good idea...
« on: June 24, 2017, 12:43:19 PM »
I built a new Trapped EFHW for 20/40 meters to use for Field day, and planned to go portable today, but today is going to be the hottest day of the year, (about 110 F), so I decided to stay in my air conditioned shack and work a few people from here instead. I know, I gave up to easy:-(

Joel
N6ALT

127
Antennas / Re: Trapped EFHW info
« on: June 13, 2017, 06:33:33 PM »
Thanks Bob, that was the exact information I was looking for.

Joel
N6ALT

128
Batteries & Solar / Re: Best portable battey pack for QRP HF/CW
« on: June 12, 2017, 10:09:23 AM »
Hi Gil,

I have noticed the same thing as you, that the cells when they come off the charger are right at 4.1 volts then they slowly drop to about 4 volts, so I'm glad that is normal. I have a Chinese Constant Current Load, (N8Q2),  that I checked the same battery on by discharging it to 3V, and it showed the battery at 1750Mah which seems closer to normal than the Imax. Maybe I'm not setting the Imax up correctly. I'm having it discharge at 500ma and have it set for a 1S battery, I'm not sure what else to do. Still learning, and wished I hadn't recycled all those laptop batteries over the years. I'm a computer tech:-( 73

Joel
N6ALT

129
Antennas / Re: Trapped EFHW info
« on: June 12, 2017, 09:49:01 AM »
Ray, thanks for the info. I'm presently using a 40 meter EF 0n 20 with a tuner, but the performance is not as good as a cut to length antenna. I can switch between the two in my shack and there are signals that pop up up that can't even be heard on the 40 meter wire with the tuner, so I'm hoping a properly tuned trap would be better. I have never used them before, but like Gil, I would rather not have to take my antenna down to change bands.

Joel
N6ALT

130
Antennas / Trapped EFHW info
« on: June 11, 2017, 06:58:42 PM »
Hi all,

I normally use EFHW antennas for all my portable ops with a 28ft fiberglass pole, but they are all mono band, so I got this idea to make a multi band 20,40 meter EFHW using these traps from, http://www.sotabeams.co.uk/pico-traps-kit-pair/ I understand how to tune the traps, but I'm not clear on how to determine where to place the trap on the wire. I assume being as I want to use it on 20 and 40, that it needs to be approximately 66 feet long total length, but where do I insert the 20 meter trap, at 33 feet? I have done a lot of searching, but have not found a definitive answer on how to figure it. Do I build the 20 meter section first with the trap at the end and tune it to length, then add the 40 meter section? Any help would be appreciated.

Joel
N6ALT 

131
Batteries & Solar / Re: Best portable battey pack for QRP HF/CW
« on: June 11, 2017, 06:41:17 PM »
So I bought a Imax B6, (not the fake one). After calibrating it so the voltage reading agrees with my accurate multi meter, I find that it will only charge a single 18650 cell to 4.1 volts or slightly less. I know 4.2 volts is the upper limit, so should it be going higher or is simply being safe. Is that normal? Also the old laptop batteries that I'm using all show that they only are rated at about 1000mah, I thought these were 2200mah batteries. maybe they are just going bad as they are pretty old. I am finding there is a lot to this LiIo charging, but I am determined to build me some portable battery packs. I ordered some balancing cables for the Imax 6 so I can balance charge my packs. Still learning.

Joel
N6ALT

132
Antennas / Re: MR100 Cheap Chinese Antenna Analyzer Review.
« on: May 12, 2017, 10:03:51 PM »
Found it, thanks.

Joel
N6ALT

133
Antennas / Re: MR100 Cheap Chinese Antenna Analyzer Review.
« on: May 12, 2017, 01:12:51 PM »
Hey Gil,

I have the MR100 also and have had good success with mine. In your video review you said you would post the graphing software somewhere? In any case I cant seem to find it. Also, my power switch is down in the right bottom side of the tester, where yours is on top I noticed, otherwise everything seems to be the same.

Joel
N6ALT

134
Batteries & Solar / Re: Best portable battey pack for QRP HF/CW
« on: May 12, 2017, 11:05:00 AM »
Gil,

I took my first Gateway Laptop battery pack apart and found 2 bad cells out of 6. The other 4 have 3.7 to 3.8 volts on them. I'm charging them one at a time in a cheapo Chinese 16850 charger for my LED torch. I will look at the charger you suggested and read up on the 16850 chemistry to see how to properly charge them. I know multiple battery packs need to use some kind of load leveling circuit, so I will investigate that as well. Thanks a lot for the tip.

Joel
N6ALT

135
General Discussion / Re: Anything interesting going on?
« on: May 12, 2017, 10:10:24 AM »
I grew up in Chico, 18 miles north of the Oroville Dam, so upstream😀. We used to take field trips in school to the dam when it was being built in the early 60s. Since then I have run Telecom cables inside of the dam itself. If it ever breaks is going to be a big deal with a lot of life/property loss. I never understood why the emergency spillway was made out of dirt. It just stands to reason that if water went over it it would wash the earthen made dam away and breach the dam, and I dont have a engeneering degree:-) I guess they never though they would have to use it.

Joel
N6ALT

Pages: 1 ... 7 8 [9] 10