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91
Antennas / Re: Trapped EFHW info
« Last post by cockpitbob on June 30, 2017, 10:40:00 PM »
Hi Joel,

I used 24AWG insulated wire and the higher dielectric constant of the insulation slows things down just a bit so yes about 63' for 7MHz and 14MHz will resonate at that length too.

You'll need a "coupler" (49:1 or 64:1 transformer) but not a tuner.  Trim for resonance at 14MHz and 7MHz will be fine.  14MHz is fussier about length because the waves are 2x shorter.  I like the wide-band transformer type couplers like LNR precision's since there's no variable cap to have to adjust.
 
92
Antennas / Re: Building a Portable 6-el. VHF 2m Yagi-Uda Antenna.
« Last post by gil on June 30, 2017, 05:01:55 PM »
Quote
Could the rod have anodizing that needed to be sanded/filed off?

Hi Bob, I did sand it. Either the brazing rods I got from China are crap, or it just wasn't hot enough, maybe both. I need to find someone locally who can help me out... I should have used brass or copper rods and be done with it...

Gil.
93
Antennas / Re: Trapped EFHW info
« Last post by caulktel 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
94
Antennas / Re: Building a Portable 6-el. VHF 2m Yagi-Uda Antenna.
« Last post by cockpitbob on June 30, 2017, 09:42:52 AM »
Thanks Bob  :)

Quote
I remember you were inquiring about aluminum solder, but I didn't see anything that looked like 2 pieces soldered together.

Well, that's because it didn't work :o The reflector is missing 3cm... I taped the piece on for now, but I need to find a way to permanently attach it with a good electrical contact.

Gil.
Could the rod have anodizing that needed to be sanded/filed off?
I've always wanted to solder aluminum but never put any time into that.  I've seen a salesman demonstrate aluminum soldering at a car show and it looked pretty simple.  I wish I had bought some rods to try.
In a class I learned to gas welded aluminum (oxy acetylene) and it's tricky as hell with everything needing to be clean and all oxide removed.
95
Antennas / Re: Building a Portable 6-el. VHF 2m Yagi-Uda Antenna.
« Last post by Jon_Garfio on June 30, 2017, 07:33:35 AM »
I watched yesterday the video, no glamour but simple and effective.

Some day I will make anything like this for 50 mhz.

Thanks for show us, Gil.


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96
Classifieds / Re: Wanted: Mountain Topper
« Last post by Jon_Garfio on June 30, 2017, 03:07:02 AM »
FB Jon.

That one was also made by Youkits. You'll have a lot of fun with it. We should try a contact some time.

Gil.


Yes, I know LNR rigs have more performance but I just paid 160 for Ten Tec (Youkits).

I hope we meet on the air as soon as posible.




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97
Classifieds / Re: Wanted: Mountain Topper
« Last post by gil on June 30, 2017, 02:59:53 AM »
FB Jon.

That one was also made by Youkits. You'll have a lot of fun with it. We should try a contact some time.

Gil.
98
Classifieds / Re: Wanted: Mountain Topper
« Last post by Jon_Garfio on June 30, 2017, 01:15:39 AM »
Finally I bought a second hand mint condition Ten Tec R40/30.



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99
Batteries & Solar / Re: Man Portable Off-Grid Power for Amateur Radio
« Last post by STN on June 29, 2017, 11:21:18 PM »
Thanks SCARRY.
Yeah we all need to justify the costs find the balance for our needs.
Looking forward to your show & tell.
100
Batteries & Solar / Re: And the winner is...
« Last post by cockpitbob on June 29, 2017, 09:25:23 AM »
Maybe it's so hot there, this is where the cold water side of the faucet comes from
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