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11
New To Radio / Re: Do I need an SWR meter for a backpack rig?
« Last post by vwflyer on August 13, 2017, 10:57:33 PM »
From one location to the next I don't have to move the tuning knob very far at all if I don't change my operating frequency. However, those tuners can have a pretty sharp Q. Often times the difference between low SWR and high is just a bump of the knob. If most everything about the two installations are the same (hight of antenna, kind of support, nearby objects, type of ground under it, etc.) it should be really close. But there are so many variables that can affect SWR and you will never be able to exactly duplicate your home setup. The hight of the tuner itself above the ground seems to make a lot of difference. Sometimes I'll stake the tuner down to the ground and sometimes I'll bungie it to a table or a branch. It just depends on my operating position's accommodations. When you set up in a randomly different location every time, you find different arrangements that seem to work best. Without a meter you won't know if it's close enough or not.
12
New To Radio / Re: Do I need an SWR meter for a backpack rig?
« Last post by SlowBro on August 13, 2017, 06:53:27 PM »
Ok but what about in the situation I describe? At home, I tune it. In the field, I put the antenna at about the same height. Would it be sufficient to say the tuner should be placed in roughly the same spot for both locations, or can they really vary that much?
13
New To Radio / Re: Do I need an SWR meter for a backpack rig?
« Last post by vwflyer on August 13, 2017, 12:52:17 PM »
I own both the Sotabeams Mountan tuner and the SOTA Tuner. The second one has the LED indicator. When I hook these to my YouKits radio which has it's own SWR meter I find that the LED does a great job of giving me low SWR on the YouKits meter. However, with the Sotabeams Mountain tuner I found that simply tuning for maximum noise is not accurate enough to assure me low SWR on the YouKits rig. I have to use the rig's SWR meter to bring it down. So I wouldn't recommend a tuner without some kind of SWR indication if your rig doesn't have a meter.
14
New To Radio / Re: Do I need an SWR meter for a backpack rig?
« Last post by SlowBro on August 13, 2017, 09:29:28 AM »
Yes that looks like the circuit I mentioned in the third post. The LED is actually the SWR "meter" and its brightness changes strength as the reflected power changes. Quite a simple and clever circuit, and should be simple to build and cost little and weigh next to nothing and take up little room in my pack. A win-win.
15
New To Radio / Re: Do I need an SWR meter for a backpack rig?
« Last post by Jon_Garfio on August 13, 2017, 07:58:48 AM »



Enviado desde mi iPhone utilizando Tapatalk Pro
16
New To Radio / Re: Do I need an SWR meter for a backpack rig?
« Last post by Jon_Garfio on August 13, 2017, 07:58:08 AM »
For this qrp activities with a rig without swr meter, I use a endfed antena tunner that tunned throught a variable capacitor or coil, no need swl meter because the perfect tunned is when the maximum noise recepcion.

You can get it the mountain tunner of Sotabeams or the Ilertenna from a spanish dealer.

The ilertenna has a led to sintonize it (minimun bright is the perfect swr tunned).


Enviado desde mi iPhone utilizando Tapatalk Pro
17
New To Radio / Re: Do I need an SWR meter for a backpack rig?
« Last post by SlowBro on August 13, 2017, 05:54:14 AM »
Probably a moot question. I just found a circuit that's super easy to build using stuff I already have on hand and that would vanish into the pack, it's so small and light. I still would like to know the answer, but more for academic reasons.
18
Radio Reviews, Questions and Comments. / Re: The 'Old Standard' FT-817ND.
« Last post by Sparks on August 13, 2017, 01:04:44 AM »
Sparks, where are you located? Is your BALUN a 4:1 or 1:1 type? You would use it to feed a dipole or Windom.. Do you have two support points high up to string a wire, only one? None? Trees?


Thanks to the three of you who have replied. Sorry for not responding until now! Life's unforeseen circumstances and family responsibilities forced me to leave the radio and the paraphernalia packed and stored with a friend in southern Norway, until further notice, so I haven't been able to look closely at the balun. I planned to use the set for portable QRP (CW only) on hiking trips in forests and mountains. I now consider selling the FT-817ND and instead acquire this radio:


http://radiopreppers.com/index.php/topic,1327.0.html  ( ELAD FDM-DUO Transceiver )
19
Radio Reviews, Questions and Comments. / ELAD FDM-DUO Transceiver
« Last post by Sparks on August 13, 2017, 12:39:06 AM »
I cannot find this Italian radio mentioned anywhere in this forum. Anyone here familiar with it?


I am asking because Norway's major ham outlet runs a summer sale with a 25% discount on this one, and I am considering selling my unused Yaesu FT-817ND to acquire the ELAD FDM-DUO instead.


Some links concerning this radio, mostly reviews:
https://eclecticlight.co/2015/10/04/sdr-the-elad-fdm-duo-an-hf-transceiver-for-all/
http://www.hamradioscience.com/elad-fdm-duo-sdr-done-right/
http://www.rtl-sdr.com/hamradioscience-reviews-the-elad-fdm-duo/
http://www.eham.net/reviews/detail/11933  (Several reviews; mostly very favorable.)
https://www.hamradio.co.uk/amateur-radio-base-station-radio-elad-transceiver/elad/elad-fdm-duo-5w-multi-use-sdr-transceiver-pd-5447.php
http://sdr.eladit.com  http://sdr.eladit.com/FDM-DUO/  (Manufacturer's site.)
http://shop.elad-usa.com/sdr-radio/  (U.S. shop.)
http://www.permo.no/index.php/item/654-elad-fdm-duo-tranceiver  (Where the summer sale is.)
20
New To Radio / Re: Do I need an SWR meter for a backpack rig?
« Last post by SlowBro on August 12, 2017, 08:15:54 PM »
Say for example I'm at home and string my antenna up a half wavelength in the trees and find that I need to put the tuner dial 3/4 of the way. (I'm building a simple MEF-1 tuner. Schematic.) If I then go out into the woods and put the antenna at about the same height, can I reasonably expect that placing the tuner dial in about the same spot will give about the same SWR? (Knowing that perfection is not required.)
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