[Lowfer] 136 KHz Opera

Lloyd Chastant lloydc6 at gmail.com
Thu Jan 8 08:35:56 EST 2015


Had a few here with v 1.5.5
Lloyd W3NF

On Thu, Jan 8, 2015 at 12:52 PM, Garry Hess <k3siw at sbcglobal.net> wrote:

> There was more opera32 activity on 136 kHz last night so a second
> comparison of v1.5.5 vs DF6NM deep search was made. Unfortunately, while
> reception was simultaneous, the antennas were different. Eprobes fed both
> sdr-iq receivers, but the one used for v1.5.5 is known to be a bit more
> sensitive than the other at LF.
>
> Decodes for v1.5.5 were:
>
> 11:13    136 VO1NA Op32 Deep Search -41 dB
> 10:38    136 VO1NA Op32 Deep Search -41 dB
> 10:03    136 VO1NA Op32 -38 dB   |---------| Fade: 3%
> 09:28    136 VO1NA Op32 Deep Search -42 dB
> 08:53    136 VO1NA Op32 Deep Search -42 dB
> 07:08    136 VO1NA Op32 Deep Search -43 dB
> 06:33    136 VO1NA Op32 Deep Search -41 dB
> 05:58    136 VO1NA Op32 Deep Search -42 dB
> 05:23    136 VO1NA Op32 Deep Search -42 dB
> 04:48    136 VO1NA Op32 Deep Search -42 dB
> 01:04    136 WD2XNS Op32 -16 dB  |---------| Fade: 0%
> 00:32    136 WD2XNS Op32 -17 dB  |---------| Fade: 0%
> 00:08    136 VO1NA Op32 Deep Search -40 dB
> ***********  08/01/2015  ***********
> 23:59    136 WD2XNS Op32 -21 dB  |---------| Fade: 0%
> 23:33    136 VO1NA Op32 Deep Search -40 dB
> 23:26    136 WD2XNS Op32 -22 dB  |---------| Fade: 0%
> ***********  07/01/2015  ***********
>
> Detections for DF6NM deep search were:
>
> 2015-01-08 10:38:54 VO1NA   2836km 137476.981Hz  12mHz -48.1dBOp  94%
> 16.6dB
> 2015-01-08 10:03:53 VO1NA   2836km 137476.978Hz   2mHz -48.9dBOp  98%
> 16.4dB
> 2015-01-08 04:48:52 VO1NA   2836km 137476.999Hz  17mHz -49.2dBOp  94%
> 16.0dB
> 2015-01-08 01:37:48 WD2XNS  1268km 137479.996Hz   3mHz -24.3dBOp  97%
> 16.4dB
> 2015-01-08 01:05:03 WD2XNS  1268km 137479.996Hz   2mHz -23.0dBOp 100%
> 20.7dB
> 2015-01-08 00:32:15 WD2XNS  1268km 137479.999Hz   5mHz -21.3dBOp  93%
> 20.8dB
> 2015-01-08 00:08:48 VO1NA   2836km 137477.004Hz   3mHz -49.3dBOp  94%
> 17.2dB
> 2015-01-07 23:59:29 WD2XNS  1268km 137480.003Hz   1mHz -28.0dBOp  92%
> 21.2dB
> 2015-01-07 23:33:47 VO1NA   2836km 137477.004Hz   3mHz -45.9dBOp  97%
> 16.2dB
> 2015-01-07 23:26:44 WD2XNS  1268km 137480.003Hz   3mHz -28.3dBOp 100%
> 21.4dB
> 2015-01-07 22:58:46 VO1NA   2836km 137477.001Hz   4mHz -47.1dBOp  94%
> 16.7dB
>
> Last night was very cold here (-11F) and the noise floor was raised
> compared to the previous night. Thus, VO1NA generally required "deep
> search" detection with v1.5.5 and that code yielded more detections than
> the DF6NM code. As mentioned earlier that was at least to some extent
> because the former receive setup was more sensitive than the latter.
> Neither code gave any falses, but I noticed that v1.5.5 produced "03:09
> 136 UW8SM de WD4KPD Op32 Deep Search 7863 km -43 dB in WASHINGTON, NC. with
> 0.1w + T-ant." Indeed UW8SM was active earlier in the evening but this was
> almost certainly a false because no Europeans reported reception at that
> time.
>
> Next time I'll switch the eprobes and see what happens.
> --
> 73, Garry, K3SIW, EN52ta, Elgin, IL
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