Re: [IRCA] Loops and the SRF-59

["Saul Chernos" <sauldx@xxxxxxxxxxxx>]

Thanks. Will keep this on file for when I'm testing the loop on the SRF.

----- Original Message ----- 
From: <satya@xxxxxxxxxxxx>
To: "Mailing list for the International Radio Club of America" 
<irca@xxxxxxxxxxxxxxxx>
Sent: Monday, January 07, 2008 11:42 AM
Subject: Re: [IRCA] Loops and the SRF-59


> Hi all:
>
> I have a couple Terk loops (essentially the same as the Radio Shack loop)
> - placing the 59 inside gives the maximum gain: probably all you would
> ever want in most situations.
>
> However, placing it at the foot of, and in line with, the loop:
>
>          ---------------      ------
>         |     LOOP      |    |  59  |
>          ---------------      ------
>
> gives somewhat reduced gain, but narrows the bandwidth for more
> selectivity :-).  The optimum separation between the 59 and the loop
> appears to be about 2 inches: adjacent slop goes down but the signal is
> still quite high.
>
> THEN, rotating the 59 in this position allows for some pretty mean phased
> nulls.  I have found that first pointing the loop such that the pest is
> nulled to the extent practical works the best: the 59 then inductively
> picks up mostly DX signal from the loop, and whatever pest signal the 59
> picks up can be cancelled out by the pest signal picked up on its own
> little ferrite.  On the Terk, there is a "line out" jack that can be
> connected to a spotter receiver, which can be used to find the best null
> orientation for the loop, after which the 59 can be brought in for the
> final kill.
>
> Note that the Terk literature indicates that the loop has a 300 ohm
> output, and the supplied parallel-wire cable is designed for that.
> However, I have found that the output is actually around 50 ohms, and
> simply connecting a 1/8" mono coaxial cable to the "line out" jack works
> the best!  The output is still rather low, and I have a Palstar AA30 and
> MFJ-1020C that can bring the loop output up to a decent level.
>
> Sometimes the phased null occurs when the 59 is sidled up along the base
> of the loop:
>
>          ---------------
>         |     LOOP      |
>          ---------------
>                         ------
>                        |  59  |
>                         ------
> or somewhere in between.  I still have to rotate the 59 a bit regardless
> of where is ends up at.  Occasionally I rotate the 59 in azimuth as well.
>
> 73 - Kevin
>
>
>
>
>>>>> Colin wrote: I pulled out my oak-frame 5' loop (from being moth-balled
>>>>> by Wellbrook!) - rewound the wire, added the capacitor..and Wahoo!
>>>>> Does
>>>>> this loop ever cook with the SRF59, the Sangean DX200VX, et al.<<<
>>
>> Interesting idea. My two Radio Shack loops are at my Burnt River ON DX
>> site,
>> so I will have to wait to try using them in conjunction with my SRF-59. I
>> use these loops with my two Sangean ATS 909 radios by simply
>> putting the radio on a plastic book reader and placing the radio and book
>> reader in the middle of the loop. I wonder what I might expect using the
>> SRF-59. Though I do think the SRF-59 might perform as well or maybe even
>> better on its own; perhaps the loop would act as some sort of phasing
>> mechanism and enhance the SRF-59? I'd be curious if anyone tries this;
>> otherwise I will wait a week or two.
>>
>> Saul
>>
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>
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