Or keep an eye on Dave GW4GTE's web site http://www.s9plus.com/ as he's bringing out a DDS kit based on a cheap module soon. (Multirock II)
Dave 'YXM
On 20 February 2012 21:41, Ken <[email protected]> wrote:
Hi Mal
They are Ebay from Hong Kong, prices vary but all about the same when you include
p&p, delivery was very quick less than a week..
I purchased a 0 - 5MHz
cased model because I was not sure how the controls would be presented on the pcb
version, cost was £51.00, they come with a plug top power unit, one some
versions the power is via a 3.5mm jack socket, others via a USB connector, I
specified 3.5mm jack, it came as USB with a power unit so need to make a
interface power lead, you will need to contact them via Ebay to make them
understand which version, other very satisfied with it.
Here are some Ebay item
numbers
Cased models: 2MHz:
170674937558, 3MHz: 290605547500. 5MHz:290614271439
Un-cased:
5MHz:290593851947
If you go into Ebay, in
the tile line type in DDS Function signal generator and ‘All
Categories’ you will find a list of them.
Anything else mail me
73s
Ken
M0KHW
Where did u get the 0 - 5 Mhz dds osc from
?
----- Original Message -----
Sent: Monday, February 20, 2012 11:11 AM
Subject: RE: LF: opera 500
Hi Mal.
Ok you are bang on the
line limit. I hope to be back on LF soon, constructing a HV power supply, the
original project was designed for the 500kHz 10w ERP limits, now starting to
re-design for the new LF band. Lucky they don’t use 470/475kHz Ifs any
more. Just purchased 0 – 5MHz DDS osc so generating the change in frequency
is no problem, but need to do new input filters for the RX pre-amp, driver
board for the 23W TX , transformers and PA for the valve TX not for the
appliance operators you can tell an appliance operator he has no solder
burns. On a different note have not heard anything regarding Finbar recently is
he ok?
Regards.
Ken M0KHW
Yes the filters are fitted. I know how the
system works as you describe it. Since the common denominator is
the copper line I thought the RF would effect both. My line is probably 3
miles to the telephone exchange via various junction boxes etc and 30 plus
years old. Not ideal and never intended to carry high speed data. The
engineer did say my line was noisy.
The whole country needs to be re-cabled
with fibre optic cable now that wideband data is here to stay and make
life easy for the Appliance Operator
----- Original Message -----
Sent: Sunday, February 19, 2012 7:26 PM
Subject: RE: LF: opera 500
Hi Mal.
The telephone portion is
speech in the standard 300Hz – 3400Hz speech band directly on the copper
pairs, the DSL sits on top of this using the DSLAM in the exchange, that is why
you have a ‘Micro Filter’ at each telephone outlet in the house, do
you have a ‘Micro Filter at each telephone outlet?
Regards.
Ken
M0KHW
From: [email protected]
[mailto:owner-[email protected]]
On Behalf Of mal hamilton
Sent: 19 February 2012 11:29
To: [email protected]
Subject: Re: LF: opera 500
No overhead lines around my QTH, all
underground and there is no problem with the telephone regardless of power on
any band.
Normally it is not a problem with CW, SSB,
or QRSS it is just a problem with Opera because of the data base feedback
facility
----- Original Message -----
Sent: Sunday, February 19, 2012 11:05 AM
Subject: RE: LF: opera 500
Hi Mal.
I had the same problem
until I went Fibre To The Cabinet (FTTC), if you are on a long local line
especially if it is overhead, the most likely there will not be any DSL
carriers above 500kHz, and what are present will have a very poor S/N ratio. I
fitted common mode chokes on every piece of cable I could find and they made no
difference, only a few watts at 500kHz and the lower HF bands would cause the
DSL router to drop out and re-train up. I had my ex (pre-retirement) colleagues
from BT Adastral Park, conduct measurements on my local line, (2.8km in
length with 30m of drop wire) as part of a national survey, the line without
the common mode chokes had no DSL carriers above 500kHz with an S/N less than
10dB, with a few watts of TX power with and without CMCs the remaining carriers
were degraded sufficiently to cause the router to retrain. Another cause could
be if you have drop wire there could be corrosion on any external screw
terminals causing ‘Rectified Joints’ like the rusty bolt effect on
radio masts, water getting into older types of drop wire can cause corrosion on
the plated steel conductors.
Hope this helps.
Ken
ex-BT Adastral Parkl
M0KHW
I have some filtering and the phone
is not effected only the data stream taking some hits.
It could well be an earth loop
problem, must investigate further.
Its a long time since I have been in
Walmsley/Liverpool. I used that route frequently Liverpool/Belfast but these
days its Cairnryan/Larne
The mode is popular because it is
easy to implement especially with CW transmitters and C/D/E amplifiers.
----- Original Message -----
Sent: Saturday, February 18, 2012 9:02 PM
Subject: Re: LF: opera 500
Yes I cam across
this some time ago with the first broad
band router, I brought one by edimax , not
supposed to be the best , but had a metal case
and a real fcc licence , that was
fine , till adsl2 , the net-gear modem supplied
was 100% u/s with any Rf on any band
....
I brought the the newer
version of the edimax , its not as Rf proof
as the old adsl-1 version, but for some
reason , only takes a hit on 160/80
Not too much
you can do , apart from the usual Rf
chokes , could try a radio card from the
router to the PC , if that's where the Rf is being
picked up ..unplug everything , see if
it crashes with just the phone line
connected ? but with just the driver , sounds a bit like a
earth link .. depends how you have the station
wired up , i am in the top front room of the
house , so no direct earth , that's out in
the shed , where the tuners are , but I
need to bond everything together to stop
cable pick up..
Sent: Saturday,
February 18, 2012 6:36 PM
Subject: Re: LF: opera 500
This seems to be the problem
although it recovers quickly but not quick enough. It happens with very little
RF being transmitted at the driver chip stage without the PA switched on.
----- Original Message -----
Sent: Saturday, February 18, 2012 1:00 PM
Subject: Re: LF: opera 500
Are you sure the
internet/broadband connection is not being frozen
by the TX . ?
I have this problem on
160 and 80 for some reason , 10 watts and
the web traffic stops
but oddly , no problem on
the other bands ...so you can miss the
incoming spots ..
check the psk map
and you will see 'who' is decoding you ..
This is one of the
reasons a server handling the ros &
opera s/n reports would be a
good addition . but the problem is finding
some one or group who could construct such a piece
of software .. it can be located on
the sever JR runs .... still looking
for offers on that ..
Sent: Saturday,
February 18, 2012 11:05 AM
Subject: Re: LF: opera 500
But why am I not seeing this info on
the right hand windiow. You are S9 audible
----- Original Message -----
Sent: Saturday, February 18, 2012 10:40 AM
Subject: Re: LF: opera 500
Op 18-2-2012 11:12, mal hamilton schreef:
Does anyone copy my op4 on 501.5 at
present. No database feedback from anyone
10:16
500 G3KEV de PA0LCE Op4 495 km -9 dB in LAGE MIERDE JO21NJ
10:16
500 G3KEV de PA3ABK Op4 443 km -3 dB in Dordrecht
10:16
500 G3KEV de G3ZJO Op4 229 km -26 dB in Northampton
10:16
500 G3KEV de ON6EO Op4 -4 dB in JO11LE
10:16
500 G3KEV de PA0ONO Op4 421 km -13 dB in Rotterdam
10:16 500 G3KEV de PA0A Op4 461 km -1 dB in
Lucaswolde JO33DE
10:15
500 G3ZJO de G3ZJO Op4 0 km +6 dB in Northampton
with .0002w + 5m inv L-rx mini whip
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