2395RE: Re: [O_P_E_R_A_] RE: JA1ODJ >> KL7L Alaska 3461 Miles 136 KHz , -37 dB s/n 5%Fade
- Nov 6, 2013
No the mode is in use from audio to light , usage may be tracked with the psk-reporter , usage on the lower bands is notable as the on/off keying and low s/n offers a alternative to the traditional qrss system , and provides accurate s/n (average) and fade pattern as % along the time lime . OP32 lower decode limit is round -40 dB s/n [ref to path-sim] with the advent of the 73Khz band OP64 -43 s/n was added to the range and linked to the psk-reporter as 4000 meter's,
A combination of AFC/FEC and noise limiting provides excellent results in difficult circumstances , using only 'normal' Ham band equipment , the shorter 30 second / 60 second modes provide good scatter propagation on vhf/uhf , the afc tracking aircraft Doppler
136 activity increases during the winter months (northern) at the moment Pacific stations are achieving
quite substantial range with limited power levels and Ae systems , the modes immunity to Doppler spread makes it very suitable for propagation via polar path where spreading disrupts mfsk/fsk
---In O_P_E_R_A_@yahoogroups.com, <bcarling@...> wrote:Question - is OPERA only used on the 136 kHz band?
On 4 Nov 2013 at 14:15, g0nbd@... wrote:
Up to -32 dB now !
Rx at Mon, 04 Nov 2013 13:19:46 GMT
From JA1NQI in Japan
Loc QM05DV by KL7L
Distance: 3444 miles bearing 272°
Frequency: 0.136 MHz (2200m), OPERA, -32dB
---In email@example.com, <g0nbd@...> wrote:
Dont think you can do much better than a mini-whip , its all down to local noise , I think some of the JA stations have remote systems , the other view is all that wire could be radiating on 136 , by coupling ?
---In firstname.lastname@example.org, <wd4rbx@...> wrote:
Hi G,TNX for the links. Lots of interesting equipment at LFengineering. I'm wondering about there preamp for VLF/LF. This is what I'm thinking. Build the DK7FC VLF active E probe circuit and use their preamp or simply use their preamp and add a 4 to 1 audio transformer for second output connection to a sound card for the Dreamers Band RX? I'm wondering if this setup would be any better then DK7FC circuit?Are you kidding me...? I Hope the JA station picture is just an optical allusion. Look at all those mains wires. I would be afraid to stand next to his tower much less climb it. How on Gods green earth does he hear anything @ 136 KHz? You go dude..!Rich
From: "g0nbd@..." <g0nbd@...>
Sent: Friday, October 25, 2013 3:49 PM
Subject: RE: Re: [O_P_E_R_A_] RE: JA1ODJ >> KL7L Alaska 3461 Miles 136 KHz , -37 dB s/n 5%FadeTx station details
Carrier 200W specifies power as 100W (50% duty cycle).
Good contact with manageable 'safe' power levels !
---In O_P_E_R_A_@yahoogroups.com, <email@example.com> wrote:I wonder what kind of antenna he's using?Rich
From: "g0nbd@..." <g0nbd@...>
Sent: Friday, October 25, 2013 12:24 AM
Subject: [O_P_E_R_A_] RE: JA1ODJ >> KL7L Alaska 3461 Miles 136 KHz , -37 dB s/n 5%Fade
http://9328.teacup.com/136khz/bbs/7499---In O_P_E_R_A_@yahoogroups.com, <firstname.lastname@example.org> wrote:JA1ODJ >> KL7L Alaska 3461 Miles 136 KHz , -37 dB s/n 5%Fade F irst JA/USA decode using OP32 on 136KHz , [no details of tx station yet] 73-G,
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