[TenTec] New Jupiter on its Way _ A Few Questions

[Rick - DJ0IP / NJ0IP]

Bob, a good loop will blow a mobile antenna out of the water.  No
comparison, especially when mounted indoors.
However my hunch is, most loops are not good loops.

It is very difficult for the average person to be able to build a good loop.
I don't feel that I can.  
I can build one that works pretty good but not as good as a Kaeferlein AMA
loop.

73 - Rick, DJ0IP
(Nr. Frankfurt am Main)


-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Bob McGraw
- K4TAX
Sent: Sunday, April 27, 2014 11:43 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] New Jupiter on its Way _ A Few Questions

I agree that loops are quieter.......but so is a dummy load.  Secondly, with
a loop in the house, I would NEVER transmit with one due to extremely high
levels of radiation.......a.k.a. brain burners.

A receiving loop has its advantages with directional properties.  That is
about the only good thing I can find about loops unless they are larger than

1/2 wave physically.   I realize we all do not have ideal antenna locations 
and in many cases we must "make do" with what is available.  If a loop is
that choice, then so be it.  Personally, I'd suggest looking at other
alternatives even to a mobile antenna, a C clamp, and a balcony railing.

73
Bob, K4TAX




----- Original Message ----- 
From: <ny6p01 at gmail.com>
To: <tentec at contesting.com>
Sent: Sunday, April 27, 2014 4:05 PM
Subject: Re: [TenTec] New Jupiter on its Way _ A Few Questions


> On Sun, Apr 27, 2014 at 03:52:32PM -0400, K8JHR wrote:
>> LEE -- AS A LONG TIME RECEIVE LOOP USER... (I have used others besides
>> the Wellbrook and DX-E antennas I mentioned previously, but I don't
>> recommend the others at all) I want to be very clear about one thing:
>>
>> YOU ARE ALWAYS BETTER OFF WITH AN ANTENNA
>> LOCATED OUTSIDE THAN IN.
>>
>> The "magnetic" loops are 'quieter" but that is a relative term.
>> Unfortunately, they are NOT IMMUNE to EMI/RFI and the rest of the
>> electrical hash one encounters in the modern domestic environment.
>> There are no free lunches... darn it, cause I LIKE to eat... and
>> "better" or "quieter"  does necessarily mean you will be out of the wood
>> on YOUR particular noise problem.
>>
>> My Wellbrook loop is down now ... I took it down last summer, as it was
>> too close to the transmit antennas to suit me.   Maybe I will mail it to
>> you to try for a while and see for yourself if it helps you situation.
>>   It worked well for me, but maybe it won't cut it in your location.
>> Antennas just seem to work that way, I guess.  You wanna try it?   All
>> you need is coax line and a way to hang a big circle of wire...  any
>> traction?
>
> Well, that's a generous offer, JHR. I am tempted to take you up on it. 
> Only
> problem is that I plan on employing it on the same mast with the
> transmitting antenna. Is that bad practice? The reason is that I am not
> allowed an outdoor antenna, and I live in a small flat.
>
> I would love to get something in the air, though. I am thinking about
> building one myself according to Rick's Old Folk's type antenna, out of
> coax and wire. Given my construction skills, it will be mickey mouse, but
> (hopefully) electrically sound, and give me an idea of what these antennas
> sound like.
>
> Jupiter should be here tomorrow. I'm curious to see how it reacts to the
> indoor antenna 4 meters from the operating position. I've ordered another 
> rf
> choke for the receiver to match the one at the antenna, and if necessary
> will take additional steps.
>
> Then, I'll think about the antenna. I've already started to look for a 
> frame
> for the loop - I'm thinking 3/4" pvc; and flexible copper tubing for the
> main loop.
>
> Lee (NY6P)
>
>
>>
>> -----------------  JHR ----------------------
>>
>>
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