Re: [IRCA] Oklahoma TP DX 8/29/17

[Chuck Hutton <charlesh3@xxxxxxx>]

But let's note Richard's original question:

Question: Is it feasible to couple a Wellbrook ALA1530LNP aerial
with a C Crane Skywave receiver without serious modification? I'd
like try using them together.
There was no request for a comparison with an FSL.

And the answer to Richard's questions remains that it will work, or at least 2 of us think so.

Chuck


________________________________
From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Nick Hall-Patch <nhp@xxxxxxxx>
Sent: Tuesday, August 29, 2017 10:31 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] Oklahoma TP DX 8/29/17

A good point Gary.

I believe that you have noted that the FSL tends to favor the lower
MW band, where its Q is highest.   Perhaps there might be a more even
match at higher frequencies when using a brute force broadband antenna.

It would be an interesting comparison.

best wishes,

Nick

  At 01:21 30-08-17, d1028gary@xxxxxxxxxxx wrote:
>Hi Nick,
>
><<< Might I disagree Gary? >>>
>
>No disagreement, necessary, Nick!
>
>I think both of us agree that the ALA1530 would boost the CC
>Skywave's MW reception beyond that of the midget stock loopstick.
>Almost any type of external antenna will do that, as long as it is
>designed for MW frequencies. In Richard's situation, however, he
>already has a very effective 8" FSL antenna, which has received DU
>audio from several different Australian stations in Oklahoma. The
>high performance of that antenna is directly related to its razor
>sharp, single-optimized-frequency advantage. Directly connecting a
>small, mismatched broadband antenna in its place is unlikely to
>accomplish anything significant. Otherwise, we would already have
>had multiple reports of DU's being received far inland on the
>ALA1530. In rare situations that might be possible with a $1,000+
>table receiver with a 50 ohm antenna input, but not with a
>mismatched Ultralight radio.
>
>Gary
>
>
>----- Original Message -----
>
>From: "Nick Hall-Patch" <nhp@xxxxxxxx>
>To: "Mailing list for the International Radio Club of America"
><irca@xxxxxxxxxxxxxxxx>
>Sent: Tuesday, August 29, 2017 5:55:26 PM
>Subject: Re: [IRCA] Oklahoma TP DX 8/29/17
>
>Might I disagree Gary?
>
>I think what the ALA1530 could do is boost sensitivity across the
>band for the CC Skywave. The old method of coupling a random wire
>into a portable radio seems to work at least as well for a 50 ohm
>output from the Wellbrook amplifer. A turn or two of wire around
>the body of the radio could hot things up nicely when the wire is
>connected between the center pin and ground of the ALA1530's RF
>output connector, normally meant to couple into a receiver input connector..
>
>Elegance might involve a loop of wire around the internal loop's
>ferrite rod, with a small input connector adapted from the ALA1530's output?
>
>At any rate, I have neither a CC Skywave nor an ALA1530, so I
>haven't tried it exactly. But the concept seemed to work haywired
>with a PL-380 that was modified already with an external 7.5" ferrite
>rod antenna being fed by a Wellbrook ALA100 amplifier hooked to a 4'
>square copper pipe antenna . Wenatchee on 900kHz became readable
>here on a late summer afternoon, with little sign on it before.
>
>Also tried the ALA-100 with the old SRF-39 Ultralight...KONA-610
>leapt out whereas just traces before.
>
>Give it a try Richard. It won't be "Ultralight" anymore, but it
>might bring up those trans-Pacifics, plus you can aim the loop in the
>right direction or use it to null interference.
>
>best wishes,
>
>Nick
>
>At 19:16 29-08-17, d1028gary@xxxxxxxxxxx wrote:
>
> ><<< Question: Is it feasible to couple a Wellbrook ALA1530LNP aerial
> >with a C Crane Skywave receiver without serious modification? I'd
> >like try using them together. >>>
> >
> >The short answer is that this wouldn't work very well, Richard.
> >
> >The Wellbrook ALA1530LNP is a relatively small broadband loop
> >designed for a 50 ohm impedance-input table receiver, while since
> >the CC Skywave is a pocket radio designed for portability, it was
> >never designed to be directly connected to any external antenna (50
> >ohm input, or otherwise). Installing such a 50 ohm antenna connector
> >on the CC Skywave would be a nightmare, and even if you do this,
> >since the ALA1530LNP is a broadband loop designed to receive all MW
> >frequencies simultaneously, it's highly unlikely to provide the
> >single-optimized-frequency performance of an inductively coupled FSL
> >antenna when used with an Ultralight radio.
> >
> >This is the flip side of a challenge that has been intriguing the
> >local Perseus-SDR DXers for about 5 years now-- how to somehow
> >combine the single-optimized-frequency performance of the FSL's with
> >the 50-ohm input Perseus-SDR's, and still have spectrum capture
> >capability. That challenge is equally monumental.
> >
> >73, Gary DeBock (in Puyallup, WA)
> >
> >
> >----- Original Message -----
> >
> >From: "Richard N Allen" <richarda@xxxxxxxxxxxx>
> >To: irca@xxxxxxxxxxxxxxxx
> >Sent: Tuesday, August 29, 2017 6:30:01 AM
> >Subject: [IRCA] Oklahoma TP DX 8/29/17
> >
> >The only possible signal heard here from across the Pacific was a
> >significant carrier from the WSW on 702 kHz, most likely from 2BL.
> >It was first heard as a slight heterodyne against 700-XEGD at 1142
> >UTC becoming much stronger toward sunrise at 1200. It peaked at 1201
> >before fading somewhat at 1204, then regaining in strength 1206. The
> >signal began fading away from 1210 but didn't disappear until around
> >1225. In the past 2BL has been the most often heard DU carrier
> >signal here, but only rising above the audio threshold a few times.
> >
> >No Asian signals were observed. Also, there wasn't the usual trace
> >of a signal from DU on 612.
> >
> >Question: Is it feasible to couple a Wellbrook ALA1530LNP aerial
> >with a C Crane Skywave receiver without serious modification? I'd
> >like try using them together.
> >
> >Richard Allen,
> >near Perry OK USA,
> >Skywave & 8-inch FSL.
> >
> >Sent from my iPad
> >
> >--
> >This message has been scanned for viruses and
> >dangerous content by MailScanner, and is
> >believed to be clean.
> >
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>Nick Hall-Patch
>Victoria, BC
>Canada
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Nick Hall-Patch
Victoria, BC
Canada

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