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
>
>--
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Nick Hall-Patch
Victoria, BC
Canada
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