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91
Antennas / Re: Magnetic loop antenna.
« Last post by gil on April 25, 2018, 03:39:49 AM »
Quote
??  21 x 3.14159=.....wow, that's a lot of copper! 

Oops, I meant perimeter, not diameter!

Good looking loop Jon. Now you can get fairly cheap vacuum capacitors from Russia, not much more than a good air capacitor.

Gil.
92
General Discussion / Re: GUERILLA QRP PORTABLE
« Last post by gil on April 25, 2018, 03:37:47 AM »
Quote
The concepts of Gil and Julian are two sides of the same coin.

I believe so as well. He uses mainly digital and I mainly use CW. The reason is probably that we both noticed that voice modes aren't that efficient. While you can certainly have lots of fun with QRP SSB and make amazing contacts, relying on it for emergency use isn't the greatest idea... Digital or CW (which could be considered a digital mode) give us a much better chance to establish contact. When you do go out and set up your station in the field, you can't help coming to similar conclusions...

Gil.
93
Radio Reviews, Questions and Comments. / Re: The Yaesu FT-891.
« Last post by gil on April 25, 2018, 03:32:05 AM »
Certainly, but 1A on receive is still an enormous current draw when you're operating on batteries. If you're operating close to your car or have some means of transportation, that's great. We are talking mainly about prepping here though, and in such an application, that radio is not a good choice IMHO. To power it, you need a larger battery and a  larger solar panel. Even the new battery chemistries aren't that small if you want a reasonable operating time. If you need to hike out of a situation on foot with a backpack, your 891 and its associated equipment will end up in a ditch after a few miles... For a camp radio, maybe, with a solution like OH8STN uses. He is the only one I have seen who came up with a workable solution, but still, I would not want that extra gear size and weight.

Gil.
94
Radio Reviews, Questions and Comments. / Re: Yaesu 817 vs 857 / 5W vs 100W
« Last post by gil on April 25, 2018, 03:23:47 AM »
My opinion as well Ray.

Julian did make it work with new battery technology and a large solar panel, but I also prefer something that fits in a small bag or a large pocket for that matter... One thing that might work is something like the new QRPVer digital QRP transceiver:

https://qrpver.com/transceivers/qrpver-1-v-2-jt65-psk-bpsk-fsq-qrp-transceiver.html

But you still need a tablet... It is a small solution for someone who does not want to learn Morse code.

Gil.
95
General Discussion / Re: GUERILLA QRP PORTABLE
« Last post by Guerilla QRP Portable on April 25, 2018, 02:32:51 AM »
Thank you for the comments.
The concepts of Gil and Julian are two sides of the same coin.
From both concepts much can be learned.
Many new photos of portable activities have been added to my qrz.com.com/db/z35m page.
96
Antennas / Re: Magnetic loop antenna.
« Last post by Jon_Garfio on April 25, 2018, 02:08:01 AM »
I made this two months ago.
It is amazing how works into the floor.
The problem is found a good variable Air capacitor at low price.

Enviado desde mi Redmi Note 4 mediante Tapatalk

97
Antennas / Re: Magnetic loop antenna.
« Last post by RadioRay on April 24, 2018, 09:46:54 PM »
I had FCC add 'narrow band telegraphy' on my marine SSB license many years ago, so was able to talk with Rene' from WLO once, during Night of Nights on marine freqs when I lived aboard.  That was fun. Unfortunately, I received that after they stopped issuing the 4 letter ship's calls to 'voluntarily equipped' vessels, so my call sign in Marine Morse was about a foot and a half long - ha ha.
98
Antennas / Re: Magnetic loop antenna.
« Last post by johno on April 24, 2018, 09:43:03 PM »
??  21 x 3.14159=.....wow, that's a lot of copper! 

I think it was Bob Grove of Monitoring Times that started a big discussion a few years ago about using RG-6.  I know we use it at a lot higher frequencies that 30 megs.  I'll certainly look into your suggestion.  I used RG-6 because I had about a mile of it and some connectors.

To me, light weight is good.  I'm now living in my first bug out location, but keep the camper fully stocked and ready to go. 

Just for info, radio station WLO transmits weather and pirate activity reports on 8.470.8 megs USB in RTTY and SITOR-B and are authorized to operate with emergency organizations should the need arise like in another Katrina scenario where everything is gone.  I monitored the bands for hurricane Harvey and the Puerto Rican hurricane and there was virtually nothing to hear, which shows me that we have a long way to go.
99
Radio Reviews, Questions and Comments. / Re: Yaesu 817 vs 857 / 5W vs 100W
« Last post by RadioRay on April 24, 2018, 07:53:49 PM »
13.8VDC at 5 Amps = 69 Watts to produce a 5 Watt signal.  Receive current is also too large for real field work., unless you're vehicle mobile or drag it to the nearby operating area , then back to the car. It's a matter of what you prefer, but I prefer portable.

>Ray
100
Radio Reviews, Questions and Comments. / Re: Yaesu 817 vs 857 / 5W vs 100W
« Last post by gil on April 24, 2018, 05:51:55 PM »
The FT-891 is a great alternative as you can just leave it at 5 w and if you need more just dial it in. You dont need 100w or the 25A draw when you can make contacts at 20watts with a good antenna like a linked dipole
Certainly... But the 891 burns 5A at 5W output. My MTR burns 0.7A at the same power output... Not to mention the 35mA on receive...
Gil

Sent from my SM-G928F using Tapatalk

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