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UTILITY-kuuntelu >> CLE >> CLE 116
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Aiheen aloittaja RJL Pvm 25.03.09 - 08:15:16

Aihe: CLE 116
Kirjoittaja RJL Pvm 25.03.09 - 08:15:16

Ennakkotietojen perusteella CLE 116 pitää sisällään kuuntelua mahdollisimman yksinkertaisilla laitteilla. Onkos kellään aikomusta osallistua ja minkälaisilla vermeillä? Itsellä on sopivasti ensi viikko pakkolomaa joten jos vihdoinkin pääsisi toteuttamaan pitkäaikaisen haaveen ja rakentaisi legendaarisen Wiio-Somerikko yksiputkisen paristovastaanottimen No 63.

Vehje on 50-luvun alkupuolen satoa, putkella DLL21 toteutettu suora vastaanotin joka rakennetaan puualustalle. Anodijännitteenä käytettiin neljää litteää taskulampunparistoa, nykyään täytynee tyytyä 9 voltin neppariparistoihin. Laite on tarkoitettu keski- tai pitkäaaltojen AM-kuunteluun mutta kun kelan joutuu joka tapauksessa käämimään itse niin sen saa helposti siihen väliinkin NDB-alueelle. Soinnillista sähkötystä voi kuunnella AM-moodissa mutta kun laitteessa on takaisinkytkentä onnistuu myös soinnittoman sähkötyksen kuuntelu.

Osia olen hankkinut jo vuosia, putken sain aikoinaan tasakymmensynttäreillä ja nyt löysin jopa muovisäätökonkat jotka tulivat eilen Amerikoista. Ajan henkeen sopivat Omega-kuulokkeet löytyi OH3AA:n rompetorilta viime kesänä. Kovin montaa muuta osaa ei olekaan joten ei muuta kuin puutöihin.

Reijo, OH3AVA

Aihe: Re: CLE116
Kirjoittaja RKA Pvm 31.03.09 - 21:06:46

Tässä siis hieman ennakkotietoa kuuntelutapahtumien järjestäjiltä ...

CLE116 will be from Good Friday, 10th April at 10 a.m. to Easter Monday,
13th April at 2 p.m. (your local times). ...

It will not exclude users of normal receivers, who will
probably be surprised to find that listening without a narrow filter does
have some unexpected advantages.

After that, the provisional dates for future listening events are:
CLE117 May 22 - May 25
CLE118 June 19 - June 22
CLE119 July 24 - July 27
CLE120 August 21 - August 24

Good listening
Brian

-RKA

Aihe: Re: CLE 116
Kirjoittaja OH5YW Pvm 04.04.09 - 07:01:15

Hi all

Our special Easter CLE will soon be here.
## If you feel that this one is 'not for you', do please have a look
## at the end of this email where I attempt to change your mind!

Days: Friday 10 April to Monday 13 April
Times: 10 a.m.(Friday) - 2 p.m.(Monday), your LOCAL time
Frequencies: Centred on 360 kHz (see below)
NDBs: Not more than 100, all 'Normal' ones or UNIDs

We are asked to listen with NON-SELECTIVE receivers
- i.e. with a WIDE filter or NO filter.
If possible, your 'barn door' should be open wide enough for you to hear
the NDBs on at least three adjacent frequencies all at the same time
(e.g. NDBs on 349 kHz and on 351 kHz with the receiver set to 350 kHz).
Listening to one NDB and ignoring several others of different pitch, can
be quite a challenge - but a satisfying one when you find how quickly
it becomes easier to do.

To take part, you could listen with:
1. Ideally, a simple home-made receiver, such as those used by Mark,
Finbar and others.
2. OR - An 'antique' receiver - e.g. valve-based, such as the R1155.
3. OR - A normal receiver but with NO filtering, or a WIDE FILTER,
say not less than 2 kHz (and no use of an audio filter).

You choose how wide a range of frequencies you will listen in,
CENTRED ON 360 kHz.
E.g. you could choose 350-370 kHz or 330-390 kHz or 260-460 kHz, etc.
(That allows each of us to choose a +/- range with enough NDBs to match
our equipment's capability, and it will also allow us to compare our
results, at least around 360 kHz).

Logs should show NOT MORE THAN 100 NDBs logged (if more than 100,
the harvester will 'drop' the loggings furthest from 360kHz!)

I will summarise everyone's equipment on the first page of the combined
results, and I may highlight the results from the simpler homebrew sets, so
please tell us:
The RECEIVER/AERIAL you used (If homebrew, quote the total number
of active devices, the transistor/valve types, whether regen., etc.)
The FILTER(S) used, if any.

All the usual procedures for making logs apply:

Send your CLE log to the List, if possible as a plain text email
and not in an attachment, with CLE116 at the start of its title.
Please show on EVERY LINE of your log:

# The full date (or Day No.) and UTC (the day changes at 00:00 UTC).
# kHz - the beacon's nominal published frequency, if you know it.
# The Call Ident.

Show those main items FIRST on each line, before other optional details
such as Offsets, Location, Distance, Cycle times, etc.
If you send incomplete logs to the List during the event, please also send
your 'Final', complete one.
Whether or not you are a first time CLE-er, please make your log interesting
to everyone by showing your own location.

If you want to, you could send us two separate logs made from different
sites - maybe from home and from a portable location (the 100 limit would
apply separately to each). The extra two hours on the first and last day
might help with 'midday' listening out of doors.

I will send the usual 'Any More Logs?' email at about 18:00 UTC on Tuesday
14th April so that you can check that your log has been found OK. Do make
sure that your log has arrived on the List at the very latest by 08:00 UTC
on Wednesday 15th. I hope to complete the combined results on that day.

Listening with 'back to basics' equipment often gives very satisfying and
unexpected results and it can also show us how we might be able to improve
our listening when operating more normally. However you choose to take
part, I hope you will find it very worthwhile.

Good listening
Brian

Aihe: Re: CLE 116
Kirjoittaja OH5YW Pvm 04.04.09 - 07:05:46

Greetings,

Now we have the final details of the upcoming CLE 116, Barn Door event,
attached is a new picture of my 1 AD, ie One Active Device receiver,
and which I will use during the CLE.

It uses just one active component, a dual gate Mosfet type BF960, the
power supply is an ordinary PP3 9v battery. The transformer a normal
mains supply ( European) 0 - 220 volt primary and 0 - 20 volt secondary type.

A Hi-Z pair of headphones is essential, however Steve Ratzlaff has reported
using 600 ohm headphones made by JRC, type ST-3 and available from
Universal Radio in Ohio. I have already ordered a pair. The Hi-Z phones
I use at present are World War 2 vintage and tend to be a little sore, physically,
on the outside of one's ears, over a protracted listening period. They are DLR5's.

No effort has been made to tidy up this set, rather it is a test bed for experiments.

Note that a simple single turn link can be used on the ferrite rod to feed a
frequency counter and although the "offset" is not strictly accurate, it nevertheless
gives one a very good idea where one is on the NDB band.

Some figures now, for those having a go building Mike Tuggles receiver and on whose
circuit my receiver is based. Thanks to Mike for sharing this circuit with us.

Using a main tuning capacitor of 0 - 450 pf.

1. Main tuning coil measured 627 uH on the ferrite rod.
2. Feedback coil measured 266 uH on ferrite rod, should be smaller in value, but worked for me.
3. Antenna coupling coil 4 turns of 20 SWG enamelled copper wire.
4. Frequency counter link 1 turn

( Note: The feedback coil of 266 uH, used about 60 turns of Litz wire. This will give you
an idea of the number of turns needed. Work up the value for the Main tuning coil )

No need to use enamelled copper wire, it just formed easy, use what you have. I used Litz wire
for the Main and Feedback windings. Use what you have, scramble wind to fit, just to get going.
Later you can use Litz for best efficiency, but with a week to go to the Barn Door CLE 116 it
is best now to just build, and improve later on, when you have the time.

If a One Active Device is not realisable without Hi-Z phones, use the secondary winding of that
mains transformer to feed a signal to a basic LM386 audio amplifier, so you can run your
ordinary 8 ohm speaker. Or, instead of that speaker, plug in your 8 ohm headset , adjusting
the volume to suit.

Best of luck in this interesting, upcoming CLE 116.

Finbar O'Connor Malin , County Donegal, Ireland.

http://editio.net/utility/fkuvat7/1ad.jpg