Re: LF: Good OP8 results .. Q 136 OP32 Test ?

["Graham" <g8fzk@g8fzk.fsnet.co.uk>]

Thanks  Markus

 

Last night  , OP32  test , I see  only  your  signal   reached  rn3agc , was  propagation  down  compared to the  last  nights , but Mike  also  reached  TF3

 

For the  psk system to  work, you  will  need  to  run the  windows  software ? 

 

S/N , well  one  problem  with   static  s/n  measurements  is that  , the  real  radio  path is  not  included , so  signal  variations  are  not  allowed  for  , decode levels  of  -40 dB s/n  are  average , so  the  lower detection  levels  can be  10 dB lower  again

 

One thing  from the test  , the  beacon timer  is  only  x2   64 mins  timer  is  too  long , next  issue  , this  will  be   30 mins  ,  Mike  may of  missed  windows  with the  1 hour  timer  running 

 

Recovery of   s/n data  from  PSk-   There  has been  a  change to the  adif  log  file,  so  , shortly  , the  adif  download , should  have the  s/n  level  of the  record  as  well  , hopefully  there  exists  at  application  to  extract the  data  and  map the  results .. 

 

73 -G..

From: Markus Vester

Sent: Monday, July 23, 2012 12:25 AM

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: Good OP8 results .. Q 136 OP32 Test ?

Hi Graham,

 

yes, I've been testing two rounds of "homemade" opera-32 on 137.590 kHz, 0.6 W ERP. Also had a go at opera-8 in the middle (ending 22:25) which apparently went unnoticed.

 

PSK reporter surely has no idea of where I live, and for some reason it erroneously located me at IO91UX (incidentally the QTH of M0FMT). Thus the distances on the web are not correct.

 

BTW is it possible to read the SNR off pskmap as well, or only from the application? -39 dB on Opera's "slightly biased average power scale" would mean -35 dB carrier vs noise in 2.5 kHz. Which would be +14 dB SNR in 30 mHz, ie. a comfortable "O" in QRSS-30, and probably readable in QRSS-10 as well.

 

Best regards,

Markus (DF6NM in Nuernberg JN59NJ)

 

PS  just noticed that TF3HZ has managed to capture my second op-32 transmission (ending 23:07). This should be about 2540 km or so.

From: Graham

Sent: Monday, July 23, 2012 12:45 AM

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: Good OP8 results .. Q 136 OP32 Test ?

Ok Stefan 

 

DF6NM   has  just  decoded  at  -39 dB  with  RN3AGC  , this  is  right  at the  lower  s/n of  OP32

22:16 136 DF6NM de RN3AGC Op32 1541 mi -39 dB in Moscow with 3w + Tube TX ant 35

So a good  start , may  be  OP32  would decode   TA , we  will  see  during  the  next  time  ?

 

73-G..

From: Stefan Schäfer

Sent: Sunday, July 22, 2012 10:35 PM

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: Good OP8 results .. Q 136 OP32 Test ?

Wow, i can see EA7HAZ. That is a nice "goal". There are a few stations on that pskmap that i never heared from on the reflector. That looks like a real chance to get some newcomers. At least i have some hope!
Well, now i am not in Heidelberg and cannot transmit this night but i may give it a try soon again.

Good luck for Mike!

73, Stefan/DK7FC


Am 22.07.2012 21:17, schrieb Graham:

Ok Stefan,

 

Well , we can only  wait  and  watch  ! , there  are  14  monitors  at the  moment , just  hope  , switched  to  OP32

It is  summer , may be  136  activity  was  not  expected , could be  on vacation etc ?

 

Audio  band  for  OP32  is   100 Hz  1500  to  1600 Hz  with  +/-   2 Hz   total  system  stability  requirement  , this  should not  be a  problem

 

GL 73 -G..

From: Stefan Schäfer

Sent: Sunday, July 22, 2012 7:05 PM

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: Good OP8 results .. Q 136 OP32 Test ?

Hi Graham,

I do not doubt that W1VD will decode me on OP32 these days. But are there others like VO1NA? I also wrote an email to him but got no answer so far. What about VE1VDM?

73, Stefan

Am 22.07.2012 18:09, schrieb Graham:

Remarkable   results  using   OP8  on on  136  from  Stefan,  Mike and  Tom  both  reaching  TF3HZ    1858 Km   and   RN3AGC / RX3QFM , though  not  at the  same  s/n level !, but  both  decoding  inside the  OP8 limits

 

While the condx, appeared  not to  support  TA propagation  , this  would  be a  good  opportunity  to  to  test the  OP32 mode

 

Could we ask, those using  Opera OP8   on 136 to  change to  OP32  for  any overnight  or  other  beacon  activity for comparison ?

 

OP32  offer's  a  6 dB lower  decode s/n  , but  with  X4   longer  tx 'times'  may  provide  range  extension greater than  predicted  by  s/n , the  system working  by  average  power  along the  time  line , being  able to  take  advantage of  qsb  and  flash  events ..

 

Thanks  All

 

Graham

G0NBD

 

INFO :-

 

Follow the progress of Op8 tests and other 136 activity on Mikes Blog,

http://g3xdv.blogspot.co.uk/

400 mW   ERP >>  136kHz Op8 to Iceland and Russia

Transmitted an Opera8 beacon again overnight on the 136kHz band and got reports
from RN3AGC, RX3QFM and TF3HZ (-32dB). The Icelandic station produced five
decodes between 0022 and 0202. Best distance was 2681km to RX3QFM. Highlights
were as follows:

02:02 136 G3XDV de TF3HZ Op8 1858 km -35 dB in Reykjavik
01:37 136 G3XDV de TF3HZ Op8 1858 km -31 dB in Reykjavik
01:12 136 G3XDV de TF3HZ Op8 1858 km -32 dB in Reykjavik
00:47 136 G3XDV de TF3HZ Op8 1858 km -32 dB in Reykjavik
00:47 136 G3XDV de RX3QFM Op8 2681 km -33 dB in KO91OO
00:22 136 G3XDV de TF3HZ Op8 1858 km -32 dB in Reykjavik
00:22 136 G3XDV de RN3AGC Op8 2483 km -34 dB in Moscow
23:57 136 G3XDV de RN3AGC Op8 2483 km -31 dB in Moscow