Things have changed over this pasted year or so. Many more new stations have come on and these newbies are running lower power and RXers that may not be up to what some of the veteran ops are using. There really isn't allot of room for QRO in the 630 meter band-fortunately those of us that have been on awhile have authorization up above 500 kHz. If I do any more QRO it will be above say 490 kHz [600 M band]-plenty of room up there-just announce a freq and folks will come up for you-20W ERP should be the limit at 630M-Bob
> From:
[email protected]> To:
[email protected]> Date: Fri, 20 Dec 2013 17:40:45 +0000
> Subject: Re: LF: OPERA overload?
>
> Jay,
>
> Just pulled these back from the psk-data base ,
>
> + 8 OPERA 0.477 20/12/2013 00:15 United States 1387498502 WE6XGR FN12LQ
> WD2XNS
> + 8 OPERA 0.477 20/12/2013 00:32 United States 1387499533 WE6XGR FN12LQ
> WD2XNS
>
> +8 is 5/6 db up on my signal over 25 miles range ,
>
> That's definitely one up from 'Cookie' more to Tall Boy , if Bob runs
> to double figures , then may be 'Grand Slam'
>
> The spectrum w/f has no link to the decode engine , but , yes under
> those conditions the noise floor is going to be much higher
>
> Can you generate a local signal 100% op4 , see if Bob will run the
> timer , give you 4 tx 8 rx window , that would give a value to the
> drop ?
>
> Use something like spec-lab to give a better view , the w/f in Op is
> only a indicator / tune aid , what happens to the noise floor , carrier
> on / off ?
>
> 73-G,
>
> --------------------------------------------------
> From: <
[email protected]>
> Sent: Friday, December 20, 2013 1:24 AM
> To: <
[email protected]>
> Subject: LF: OPERA overload?
>
> > G
> >
> > I have to take issue with your earlier comments about OPERA being immune
> > to overload. Check out the
> > waterfall below. I'm looking for OP8 signals out west (UT and VE7) and
> > WE2XGR/6 running OP4 is
> > clearly desensing the OPERA software. Sensitivity can be seen returning to
> > normal between keyed
> > characters.
> >
> > The receiving setup is a 1000' BOG (beverage on ground) > Harris RF-590
> > receiver > Delta 44 sound
> > card. Receiver AGC is off and the received signal level is well below that
> > to cause gain compression
> > in the receiver. Likewise, the sound card is being operated well below
> > compression/clipping levels.
> >
> > Weak signals do not decode under these conditions ... same as with WSPR.
> >
> > Jay W1VD WD2XNS WE2XGR/2 WG2XRS/2
> >
> >
> >
> >
> >
>
