MIME-Version: 1.0
Date: Thu, 28 May 2015 21:13:34 +0100
Message-ID: <CAA8k23QWqS1sg3XyPs58WpOEWpXYVyVxSeqPEEqj1Bfza+yjmw@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org, rsgb_lf_group@yahoogroups.co.uk
Subject: LF: WSPR-15 Test transmission
Content-Type: multipart/alternative; boundary=001a11c2902a7c7865051729fe6d
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: O

--001a11c2902a7c7865051729fe6d
Content-Type: text/plain; charset=UTF-8

I'll be running WSPR-15 again this evening.  3s% duty cycle (is that what
you meant from Frame Rate , Andy F...?)

Frequency 475809.3HZ, EIRP +33dBm

I'm pondering a dual mode WSPR-2 / WSPR-15  beacon source using a PIC + DDS
, Interleaving transmissions using the the two symbol rates and controlling
frequency appropriately.

Its a bit of a mind bender trying to work out a suitable sequence for the
two sub-modes.   I want a PN sequence that averages out around 33%, but the
lowest common denominator for the timing interval is one minute, and the
highest common factor is 30 minutes. So any pre-stored pattern will need to
be based on a one minute grid.  Ideally I want a technique that allows turn
on at any arbitrary time ( GPS timing is used) and it falls into the best
place in the sequence to match 15 minute or two minute repeats.

The  PN sequence will probably have to repeat every 4 or 6 hours.   My
current WSPR-15 sequence repeats ever 7.5 hours, or every 60 slots
On WSPR-2 the same PN sequence is in use, where it repeats after 2 hours.

Andy  G4JNT

--001a11c2902a7c7865051729fe6d
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">I&#39;ll be running WSPR-15 again this evening. =C2=A03s% =
duty cycle (is that what you meant from Frame Rate , Andy F...?)<div><br></=
div><div>Frequency 475809.3HZ, EIRP +33dBm</div><div><br></div><div>I&#39;m=
 pondering a dual mode WSPR-2 / WSPR-15 =C2=A0beacon source using a PIC + D=
DS , Interleaving transmissions using the the two symbol rates and controll=
ing frequency appropriately.</div><div><br></div><div>Its a bit of a mind b=
ender trying to work out a suitable sequence for the two sub-modes. =C2=A0 =
I want a PN sequence that averages out around 33%, but the lowest common de=
nominator for the timing interval is one minute, and the highest common fac=
tor is 30 minutes. So any pre-stored pattern will need to be based on a one=
 minute grid.=C2=A0 Ideally I want a technique that allows turn on at any a=
rbitrary time (=C2=A0GPS timing is used) and it falls into the best place i=
n the sequence to match 15 minute or two minute repeats. =C2=A0</div><div><=
br></div><div>The =C2=A0PN sequence will probably have to repeat every 4 or=
 6 hours. =C2=A0 My current WSPR-15 sequence repeats ever 7.5 hours, or eve=
ry 60 slots</div><div>On WSPR-2 the same PN sequence is in use, where it re=
peats after 2 hours.<br></div><div><br></div><div>Andy =C2=A0G4JNT</div><di=
v><br></div></div>

--001a11c2902a7c7865051729fe6d--