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Re: LF: 137kHz rarity

To: <[email protected]>
Subject: Re: LF: 137kHz rarity
From: "Graham" <[email protected]>
Date: Sun, 17 Apr 2016 14:26:19 +0100
Importance: Normal
In-reply-to: <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
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Rx at Sat, 16 Apr 2016 23:40:00 GMT
From RC4HAA by M0DSZ Loc IO82LS
Frequency: 0.136 MHz (2200m), OPERA, -38dB
Distance: 3478 km bearing 291°
Yes, -38 dB , full decode ,  be interesting  to see  the  fade pattern  ,
M0DSZ 2200m OPERA 3478 km 23:40:00
F6CNI 2200m OPERA 3236 km 23:40:01
PA7EY 2200m OPERA 2999 km 23:44:26
EW6BN 2200m OPERA 1402 km 23:40:04
R3LW 2200m OPERA 1257 km 23:40:07
UZ2HZ 2200m OPERA 1247 km 23:40:05
RN3AUS 2200m OPERA 923 km 23:40:20
UA4WPF 2200m OPERA 459 km 23:40:01

From: "Mike Dennison" <[email protected]>
Sent: Sunday, April 17, 2016 1:01 PM
To: <[email protected]>; <[email protected]>
Subject: LF: 137kHz rarity

> There was some unusual propagation last night on 137kHz.
> Opera32 transmissions from IZ7SLZ were received well by M0DSZ or
> several hours but were not receive at all by me. Nothing strange
> there as M0DSZ has an exceptionally good receiver.
> I received R7NT's Op32 several times during the night whilst M0DSZ
> received him less often. Again, nothing odd as LF propagation is
> often selective.
> The really interesting thing was R7NT's SNR was around -40B with most
> reporting stations around Europe, and with me most of the time. But
> at 0007 he was -19dB, and at 0207 -17dB. Between these peaks, at
> 2312, 0112 and 0312UTC he was back to around -40.
> These were all genuine transmissions reported by several Eu stations
> every time, but no-one reported those big peaks which were more than
> 20dB above the Op32 reception limit.
> Big propagation enhanced peaks are commonplace on the HF-SHF bands
> but rare on 137kHz. It seems they are also geographically very
> selective.
> Mike, G3XDV
> ==========
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