Ok Joe ,
I wondered why you where missing from the map , for last nights sing
along !
600 mtrs mid band qrg now 478.500 with +/- 50 Hz pass band
,
still 477.000 USB . but the pass band has been centred on 1500 Hz
73-G,
--------------------------------------------------
From: <[email protected]>
Sent: Monday, October 20, 2014 1:01 PM
To: <[email protected]>
Subject: Re: LF: 136 Khz opera 32 deep search last night km07ks
Hi Markus and Graham,
Thanks for the info on op. I'll look for a lower QRG in
the passband for 2200m OP32. Hopefully 478.65 is still OK for OP8.
It is planned to add 630m to the 2200m exciter by replacing the
CMOS 4020 (divide by 16) with a faster 74LS161. The DDS output is
set at 16f and then divided to improve the resolution and square the
output, but 16x479 kHz is too fast for the 4020.
Thank-you to IZ7SLZ and SV8RV for their reception reports.
73
Joe VO1NA
On Sun, 19 Oct 2014, Graham wrote:
Hi Joe ,
Quite possibly ,
One of the unintended consequences of NED !
[ Never Ending Development]
The last major upgrade to Opera , saw the removal of dual speeds
for each band and the audio being centred on 1500 Hz
That put the mid band Rf-QRG at 137.500 with decoder pass band
+/- say 45 Hz
However , decode threshold and false decodes are improved , with
some decodes showing with fade losses of 60%
477K is now set at OP8 478.500 KHz
73-Graham
--------------------------------------------------
From: <[email protected]>
Sent: Sunday, October 19, 2014 7:26 PM
To: <[email protected]>
Subject: Re: LF: 136 Khz opera 32 deep search last night km07ks
Thanks Dionysios and Terry GW0EZY for the reports of the OP
transmissions.
Thanks also to DF6NM for his grabber and accurate freq measurements.
It seems many OP stations have migrated down about 50 Hz. Did I miss
something?
The TX was running 240 watts 2.2 amps to the 100 m wire. Will be QRV
& QRO again tonight.
73
Joe VO1NA
On Sun, 19 Oct 2014, Dionysios Vlachiotis wrote:
sv8rv km07ks Opera-32 correlation
date time call distance frequency bandwidth snr
correlation
2014-10-19 03:54:24 VO1NA 5905km 137554.746Hz 2mHz -47.6dBOp 92%
15.1dB
2014-10-19 01:34:22 VO1NA 5905km 137554.746Hz 2mHz -47.0dBOp 84%
16.7dB
2014-10-18 22:58:33 DF6NM 1510km 137507.749Hz 2mHz -29.9dBOp 97%
20.0dB
2014-10-18 22:50:32 G3XDV 2266km 137529.800Hz 4mHz -39.3dBOp 100%
20.3dB
2014-10-18 20:34:20 G3XDV 2266km 137529.800Hz 2mHz -41.7dBOp 92%
19.9dB
2014-10-18 19:55:44 DF6NM 1510km 137507.749Hz 2mHz -33.0dBOp 88%
19.7dB
2014-10-18 18:24:46 G3XDV 2266km 137529.797Hz 9mHz -46.7dBOp 91%
17.7dB
73 de SV8RV
Dionysios Vlachiotis
Zakynthos (Zante) island GREECE
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