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Content preview: Lot depends on the RX Bob That's a nice set , looking in the book , the first mixer LO drive is +23 dBm 200 mW , compared to the Racal Ra 1778 / Ra 6790gm at +37 to +39 dBm 5 to 8 watts drive , that gives a dynamic range ~ 120 dB , that puts a question round the large signal handling I run my 6790 with no pre-amp, clean right upto the local 10Kw mw tx , where the ra1778 with pre-amp takes a hit , same mixer , but the pre-amp over loads , [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.42 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 783e848a630124d13ae6ef06c152f951 Subject: Re: LF: OPERA overload? Content-Type: multipart/alternative; boundary="----=_NextPart_000_00EF_01CEFDBB.C6BB7A10" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30,HTML_MESSAGE, MISSING_OUTLOOK_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Status: O X-Status: X-Keywords: X-UID: 2536 This is a multi-part message in MIME format. ------=_NextPart_000_00EF_01CEFDBB.C6BB7A10 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Lot depends on the RX Bob=20 That's a nice set , looking in the book , the first mixer LO drive = is +23 dBm 200 mW , compared to the Racal Ra 1778 / Ra 6790gm = at +37 to +39 dBm 5 to 8 watts drive , that gives a dynamic = range ~ 120 dB , that puts a question round the large signal = handling I run my 6790 with no pre-amp, clean right upto the = local 10Kw mw tx , where the ra1778 with pre-amp takes a hit , = same mixer , but the pre-amp over loads , =20 SDR is the way out of the problem , digitise the Ae signal . G,=20 From: Bob Raide=20 Sent: Friday, December 20, 2013 5:54 PM To: rsgb_lf_group@blacksheep.org=20 Subject: RE: LF: OPERA overload? G et all; 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 =20 > From: g8fzk@g8fzk.fsnet.co.uk > To: rsgb_lf_group@blacksheep.org > Date: Fri, 20 Dec 2013 17:40:45 +0000 > Subject: Re: LF: OPERA overload? >=20 > Jay, >=20 > Just pulled these back from the psk-data base , >=20 > + 8 OPERA 0.477 20/12/2013 00:15 United States 1387498502 WE6XGR = FN12LQ=20 > WD2XNS > + 8 OPERA 0.477 20/12/2013 00:32 United States 1387499533 WE6XGR = FN12LQ=20 > WD2XNS >=20 > +8 is 5/6 db up on my signal over 25 miles range , >=20 > That's definitely one up from 'Cookie' more to Tall Boy , if Bob runs=20 > to double figures , then may be 'Grand Slam' >=20 > The spectrum w/f has no link to the decode engine , but , yes under=20 > those conditions the noise floor is going to be much higher >=20 > Can you generate a local signal 100% op4 , see if Bob will run the=20 > timer , give you 4 tx 8 rx window , that would give a value to the=20 > drop ? >=20 > Use something like spec-lab to give a better view , the w/f in Op is=20 > only a indicator / tune aid , what happens to the noise floor , = carrier=20 > on / off ? >=20 > 73-G, >=20 > -------------------------------------------------- > From: > Sent: Friday, December 20, 2013 1:24 AM > To: > Subject: LF: OPERA overload? >=20 > > G > > > > I have to take issue with your earlier comments about OPERA being = immune=20 > > to overload. Check out the > > waterfall below. I'm looking for OP8 signals out west (UT and VE7) = and=20 > > WE2XGR/6 running OP4 is > > clearly desensing the OPERA software. Sensitivity can be seen = returning to=20 > > normal between keyed > > characters. > > > > The receiving setup is a 1000' BOG (beverage on ground) > Harris = RF-590=20 > > receiver > Delta 44 sound > > card. Receiver AGC is off and the received signal level is well = below that=20 > > to cause gain compression > > in the receiver. Likewise, the sound card is being operated well = below=20 > > compression/clipping levels. > > > > Weak signals do not decode under these conditions ... same as with = WSPR. > > > > Jay W1VD WD2XNS WE2XGR/2 WG2XRS/2 > > > > > > > > > >=20 >=20 ------=_NextPart_000_00EF_01CEFDBB.C6BB7A10 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Lot  depends on the  RX Bob =
 
That's a nice  set , looking  in = the =20 book  , the  first  mixer LO drive  is   = +23=20 dBm  200 mW  , compared to  the  Racal  Ra = 1778  /=20 Ra 6790gm  at  +37 to +39 dBm  5 to 8 watts  =20 drive  , that  gives  a dynamic  range  ~ 120 = dB=20 ,   that puts a  question round the  large = signal =20 handling   I run my  6790  with  no  = pre-amp,=20 clean  right  upto the  local  10Kw  mw  = tx =20 , where  the  ra1778  with  pre-amp  takes = a hit ,=20 same mixer  , but the  pre-amp over  loads ,  =20
 
SDR is the  way  out  of = the  problem=20 , digitise the  Ae signal .
 
G,

From: Bob Raide
Sent: Friday, December 20, 2013 5:54 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: RE: LF: OPERA overload?

G et all;
Things have changed over this pasted year or = so. =20 Many more new stations have come on and these newbies are running = lower=20 power and RXers that may not be up to what some of the veteran ops are=20 using.  There really isn't allot of room for QRO in the 630 meter=20 band-fortunately those of us that have been on awhile have authorization = up=20 above 500 kHz.  If I do any more QRO it will be above say 490 = kHz [600=20 M band]-plenty of room up there-just announce a freq and folks will come = up for=20 you-20W ERP should be the limit at 630M-Bob
 
> From: g8fzk@g8fzk.fsnet.co.uk
> To:=20 rsgb_lf_group@blacksheep.org
> Date: Fri, 20 Dec 2013 17:40:45=20 +0000
> Subject: Re: LF: OPERA overload?
>
> = Jay,
>=20
> Just pulled these back from the psk-data base ,
> =
> + 8=20 OPERA 0.477 20/12/2013 00:15 United States 1387498502 WE6XGR FN12LQ =
>=20 WD2XNS
> + 8 OPERA 0.477 20/12/2013 00:32 United States 1387499533 = WE6XGR=20 FN12LQ
> WD2XNS
>
> +8 is 5/6 db up on my signal = over 25=20 miles range ,
>
> That's definitely one up from 'Cookie' = more to=20 Tall Boy , if Bob runs
> to double figures , then may be 'Grand=20 Slam'
>
> The spectrum w/f has no link to the decode engine = , but ,=20 yes under
> those conditions the noise floor is going to be much=20 higher
>
> Can you generate a local signal 100% op4 , see = if Bob=20 will run the
> timer , give you 4 tx 8 rx window , that would = give a=20 value to the
> drop ?
>
> Use something like = spec-lab to=20 give a better view , the w/f in Op is
> only a indicator / tune = aid ,=20 what happens to the noise floor , carrier
> on / off ?
> =
>=20 73-G,
>
>=20 --------------------------------------------------
> From:=20 <jrusgrove@comcast.net>
> Sent: Friday, December 20, 2013 = 1:24=20 AM
> To: <rsgb_lf_group@blacksheep.org>
> Subject: LF: = OPERA=20 overload?
>
> > G
> >
> > I have to = take issue=20 with your earlier comments about OPERA being immune
> > to = overload.=20 Check out the
> > waterfall below. I'm looking for OP8 signals = out west=20 (UT and VE7) and
> > WE2XGR/6 running OP4 is
> > = clearly=20 desensing the OPERA software. Sensitivity can be seen returning to =
> >=20 normal between keyed
> > characters.
> >
> > = The=20 receiving setup is a 1000' BOG (beverage on ground) > Harris RF-590 =
>=20 > receiver > Delta 44 sound
> > card. Receiver AGC is off = and the=20 received signal level is well below that
> > to cause gain=20 compression
> > in the receiver. Likewise, the sound card is = being=20 operated well below
> > compression/clipping levels.
>=20 >
> > Weak signals do not decode under these conditions ... = same as=20 with WSPR.
> >
> > Jay W1VD WD2XNS WE2XGR/2 = WG2XRS/2
>=20 >
> >
> >
> >
> >
>=20
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