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.....
Seden,WD6ELU
"YU1ASB to WD6ELU CQ CQ CQ...."
Medium Frequencies (300kHz-3MHz)
The only amateur medium-frequency band is situated just above the domestic AM broadcast band.
Ground wave provides reliable communication out to 150 km (90 mi) or during the day, when no
other form of propagation is available. Long-distance paths are made at night via the F2 layer.
To tell you the truth i never worked on this...Pitty!
1.8-2.0 MHz (160 m)
The top band, as it is sometimes called, suffers from extreme daytime D-layer absorption.
Even at high radiation angles, virtually no signal can pass through to the F layer, so
daytime communication is limited to ground-wave coverage. At night, the D layer quickly
disappears and worldwide 160-m communication becomes possible via F2-layer skip. Atmospheric
and man-made noise limit propagation.Tropical and midlatitude thunderstorms cause high levels
of static in summer, making winter evenings the best time to work DX at 1.8 MHz. A proper
hoice of receiving antenna can often significantly reduce the amount of received noise while
enhancing desired signals.
We have rig in local club but i do not have time to go there oftenly....Also no conditions to
put beam in backyard...stupid reason but true!
I usually work on my 80m....3.737 and 3.725...when at home.Preparing shaft for next season...
Right now i am far away from home and must stay until 09/2007.
In local we are using 145.4MHz....and R2,R3 and R7+...QL6WU works excellent! Although i prefer
"Slim Jim" due verical polarisation...not located well..any GP would do the job i suppose.
But there is 50MHz band very popular lately in my country...Intend to make transceivier when
have some spare time...i guess in winter...I also have CB FM/AM...but this band almost abandoned
here in Serbia...Pitty!
FOR "BELEIVERS" TO READ VERY CAREFULLY !!! (ESTEBAN JUST READ THIS)
Noise
Many unintentional radio emissions result from man-made sources. Broadband radio signals are
produced whenever there is a spark, such as in contact switches, electric motors, gasoline
engine spark plugs and faulty electrical connections. Household appliances, such as fluorescent
lamps, microwave ovens, lamp dimmers and anything containing an electric motor may all produce
undesirable broadband radio energy. Devices of all sorts, especially computers and anything
controlled by microprocessors,television receivers and many other electronics also emit radio
signals that may be perceived as noise well into the UHF range. In many cases, these sources
are local and can be controlled with proper measures.
High-voltage transmission lines and associated equipment, including transformers, switches and
lightning arresters, can generate high-level radio signals over a wide area, especially if they
are corroded or improperly maintained. Transmission lines may act as efficient antennas at some
frequencies, adding to the noise problem. Certain kinds of street lighting, neon signs and
industrial equipment also contribute their share of noise.
Now can anybody tell me something about LRL accuracy!? If we presume that lrl is workin at all?
Great Esteban knows the "secret", of course! Aint no noise which can disturb Estebans
"whoola-whoola" devices...!
Seden,WD6ELU
"YU1ASB to WD6ELU CQ CQ CQ...."
Medium Frequencies (300kHz-3MHz)
The only amateur medium-frequency band is situated just above the domestic AM broadcast band.
Ground wave provides reliable communication out to 150 km (90 mi) or during the day, when no
other form of propagation is available. Long-distance paths are made at night via the F2 layer.
To tell you the truth i never worked on this...Pitty!
1.8-2.0 MHz (160 m)
The top band, as it is sometimes called, suffers from extreme daytime D-layer absorption.
Even at high radiation angles, virtually no signal can pass through to the F layer, so
daytime communication is limited to ground-wave coverage. At night, the D layer quickly
disappears and worldwide 160-m communication becomes possible via F2-layer skip. Atmospheric
and man-made noise limit propagation.Tropical and midlatitude thunderstorms cause high levels
of static in summer, making winter evenings the best time to work DX at 1.8 MHz. A proper
hoice of receiving antenna can often significantly reduce the amount of received noise while
enhancing desired signals.
We have rig in local club but i do not have time to go there oftenly....Also no conditions to
put beam in backyard...stupid reason but true!
I usually work on my 80m....3.737 and 3.725...when at home.Preparing shaft for next season...
Right now i am far away from home and must stay until 09/2007.
In local we are using 145.4MHz....and R2,R3 and R7+...QL6WU works excellent! Although i prefer
"Slim Jim" due verical polarisation...not located well..any GP would do the job i suppose.
But there is 50MHz band very popular lately in my country...Intend to make transceivier when
have some spare time...i guess in winter...I also have CB FM/AM...but this band almost abandoned
here in Serbia...Pitty!
FOR "BELEIVERS" TO READ VERY CAREFULLY !!! (ESTEBAN JUST READ THIS)
Noise
Many unintentional radio emissions result from man-made sources. Broadband radio signals are
produced whenever there is a spark, such as in contact switches, electric motors, gasoline
engine spark plugs and faulty electrical connections. Household appliances, such as fluorescent
lamps, microwave ovens, lamp dimmers and anything containing an electric motor may all produce
undesirable broadband radio energy. Devices of all sorts, especially computers and anything
controlled by microprocessors,television receivers and many other electronics also emit radio
signals that may be perceived as noise well into the UHF range. In many cases, these sources
are local and can be controlled with proper measures.
High-voltage transmission lines and associated equipment, including transformers, switches and
lightning arresters, can generate high-level radio signals over a wide area, especially if they
are corroded or improperly maintained. Transmission lines may act as efficient antennas at some
frequencies, adding to the noise problem. Certain kinds of street lighting, neon signs and
industrial equipment also contribute their share of noise.
Now can anybody tell me something about LRL accuracy!? If we presume that lrl is workin at all?
Great Esteban knows the "secret", of course! Aint no noise which can disturb Estebans
"whoola-whoola" devices...!
Attached Files
bon salut du Mexique
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