Hi Gery,
depending on the antenna/matching sytem Q some might have a SWR-BW
issue,i.e. not enough bandwidth (3kHz) with a decent swr
for SSB.
Lossy sytems would be better in this respect...
I remember a QSO on 160m with a German OM using the famous (in Germany)
Siemens tuned loop antenna (circumference about 8m and very
wide conductor diameter) which was used by military and Bundesgrenzschutz.
He tuned to SWR 1.0 with a CW carrier but when he started talking in SSB SWR
went up to >3 and output power
of the TRX was folded back.
There is a 1.1kHz wide digital SSB mode called FreeDV
http://freedv.org/tiki-index.php
My personal experience with that mode seems not very promising.
You need at least 10dB SNR for a stable decoding and the voice sounds like
from a robot.
73
Clemens
DL4RAJ
________________________________
From: [email protected]
[mailto:[email protected]] On Behalf Of Holger 'Geri',
DK8KW - DI2BO - W1KW
Sent: Wednesday, January 02, 2013 9:37 PM
To: [email protected]
Subject: Re: LF: 477 A local SSB chat band ?
Hi,
I kind of like the idea of an SSB channel. I just pulled out the
conditions of my first secial license for 160m from 1973 or 1974. That said
1815 to 1835 kHz with 10 Watts in CW, additionally one SSB channel for 1832
to 1835 kHz, so why not trying this on 630m, too? Here in Germany we are
currently limited to 800 Hz bandwidt but I am sure we can sork towards a
special license under certain conditions such as daylight operation only ..
sounds good to me!
Vy 73
Geri, DK8KW
----- Original Message -----
From: Graham <mailto:[email protected]>
To: [email protected]
Sent: Wednesday, January 02, 2013 8:58 PM
Subject: Re: LF: 477 A local SSB chat band ?
Hi Pete
Its quite obvious that the allocation is quite able
to support normal armature activity , and why not ? its no longer a
experimental allocation , its just the same as 10 or top band , un
expected results today though ! ssb sounds odd , may be as the
path is stable , sstv ? must be a narrow mode , and the 'new'
digital voice is 2KHz , but that requires a linear Tx path
As for the band edge
I'm straining to find a engineering reason , that
wspr and qrss has decided to run mid band ? Im sure users had a
reasonable discussion at the introduction of the band , to place the
modes at the edges , with live cw a the lower portion ? its well
know that these long carrier modes cause disruption to other band
users and are well placed at the band edges , 'vanity beacons' is a
term I have seen noted in referral, as occupancy increases , by users
not linked or even aware of discussions taking place on these
groups , i'm sure there will be problems leading to the introduction
of band plan's , for some the plans form part of the licence
conditions ..
Is Opera a vanity system ? , actually no, it compliments
ros- data mode in that the ave s/n readings can be used to determine
if a path will support the data mode , each having the same
averaging s/n reading taken along the time line ,
73 -G..
From: M0FMT <mailto:[email protected]>
Sent: Wednesday, January 02, 2013 6:21 PM
To: [email protected]
Subject: Re: LF: 477 A local SSB chat band ?
Hi all
One SSB channel at the high edge of the band only used
during daylight hours no DXing!
73 es GL es HNY Pete M0FMT IO91UX
From: Graham
<[email protected]>
To: [email protected]
Sent: Wednesday, 2 January 2013, 16:13
Subject: LF: 477 A local SSB chat band ?
Quite intriguing propagation on this 'new' band
From some unexpected early 600 mile + Opera
decodes last night , to several wspr TA decodes , [G8's again ..]
to today's test with Gary using USB-SSB voice ,
Where as at 1300z we had 5/9 signals each
way as expected over 25 miles , GI3PDN Ray , called on CW , to
give a report of 5/9 across the Irish Sea , some 100 miles for
our two signals , his CW also in the 5/9/9 region, one wonders how
far inland the signals travelled ?
After a short 3 way qso, we closed the test
round 1330z , may not of been quite as sociable after dark , but
with a small Ae , 40 x 70 ft iv L and 35 ft Top load vert , 50
watts pep , results defiantly superior to say 160 mtrs using the
same Ae's
73 -G
G0NBD
E-Mail ist virenfrei.
Von AVG überprüft - www.avg.de
Version: 2013.0.2805 / Virendatenbank: 2637/5996 - Ausgabedatum:
29.12.2012
|
