For the past two nights, in the evening around 10:00 or so on the US
east coast
on 5.065 (or was it 5.056) mHz sideband, I have heard a broadcast that I
cannot identify. I cannot tell if it's lower or upper sideband as my
reciever has an adjustable BFO,
not a LSB/USB switch.

It is definately aviation. It's a two way conversation of which I can
only
make out the ground based side. I cannot make out the aircraft side.
It sounds like instrutions of some sort but not the type you would hear from
an approach or ground controller and anyway, it's not on standard
(civilian) tower freqs.
It's a two way conversation so it's not ATIS.
Most of the side of the conversation that I can hear seems to consist of
LAT/LON quordinates.

That's as best as I can describe it. If you need more info, I'll try to
listen better
so as to supply better details.

Any idea what this might be?

Thanks,

coustanis wrote:

For the past two nights, in the evening around 10:00 or so on the US
east coast
on 5.065 (or was it 5.056) mHz sideband, I have heard a broadcast that I
cannot identify. I cannot tell if it's lower or upper sideband as my
reciever has an adjustable BFO,
not a LSB/USB switch.

It is definately aviation. It's a two way conversation of which I can
only
make out the ground based side. I cannot make out the aircraft side.
It sounds like instrutions of some sort but not the type you would hear from
an approach or ground controller and anyway, it's not on standard
(civilian) tower freqs.
It's a two way conversation so it's not ATIS.
Most of the side of the conversation that I can hear seems to consist of
LAT/LON quordinates.

That's as best as I can describe it. If you need more info, I'll try to
listen better
so as to supply better details.

Any idea what this might be?

What radio are you using? It's always possible you are receiving an image.

N8KDV wrote:

coustanis wrote:

For the past two nights, in the evening around 10:00 or so on the US
east coast
on 5.065 (or was it 5.056) mHz sideband, I have heard a broadcast that I
cannot identify. I cannot tell if it's lower or upper sideband as my
reciever has an adjustable BFO,
not a LSB/USB switch.

It is definately aviation. It's a two way conversation of which I can
only
make out the ground based side. I cannot make out the aircraft side.
It sounds like instrutions of some sort but not the type you would hear from
an approach or ground controller and anyway, it's not on standard
(civilian) tower freqs.
It's a two way conversation so it's not ATIS.
Most of the side of the conversation that I can hear seems to consist of
LAT/LON quordinates.

That's as best as I can describe it. If you need more info, I'll try to
listen better
so as to supply better details.

Any idea what this might be?

What radio are you using? It's always possible you are receiving an image.

DX-390
http://www.transistor.org/collection...alistic11.html

coustanis wrote:

N8KDV wrote:

coustanis wrote:

For the past two nights, in the evening around 10:00 or so on the US
east coast
on 5.065 (or was it 5.056) mHz sideband, I have heard a broadcast that I
cannot identify. I cannot tell if it's lower or upper sideband as my
reciever has an adjustable BFO,
not a LSB/USB switch.

It is definately aviation. It's a two way conversation of which I can
only
make out the ground based side. I cannot make out the aircraft side.
It sounds like instrutions of some sort but not the type you would hear from
an approach or ground controller and anyway, it's not on standard
(civilian) tower freqs.
It's a two way conversation so it's not ATIS.
Most of the side of the conversation that I can hear seems to consist of
LAT/LON quordinates.

That's as best as I can describe it. If you need more info, I'll try to
listen better
so as to supply better details.

Any idea what this might be?

What radio are you using? It's always possible you are receiving an image.

DX-390
http://www.transistor.org/collection...alistic11.html

While I'm not 100% sure I'd almost be willing to bet you are receiving an image from
higher up in the band.

Have to try and check out that frequency range tonight.

N8KDV wrote:

coustanis wrote:

N8KDV wrote:

coustanis wrote:

For the past two nights, in the evening around 10:00 or so on the US
east coast
on 5.065 (or was it 5.056) mHz sideband, I have heard a broadcast that I
cannot identify. I cannot tell if it's lower or upper sideband as my
reciever has an adjustable BFO,
not a LSB/USB switch.

It is definately aviation. It's a two way conversation of which I can
only
make out the ground based side. I cannot make out the aircraft side.
It sounds like instrutions of some sort but not the type you would hear from
an approach or ground controller and anyway, it's not on standard
(civilian) tower freqs.
It's a two way conversation so it's not ATIS.
Most of the side of the conversation that I can hear seems to consist of
LAT/LON quordinates.

That's as best as I can describe it. If you need more info, I'll try to
listen better
so as to supply better details.

Any idea what this might be?

What radio are you using? It's always possible you are receiving an image.

DX-390
http://www.transistor.org/collection...alistic11.html

While I'm not 100% sure I'd almost be willing to bet you are receiving an image from
higher up in the band.

Have to try and check out that frequency range tonight.

Ok, but what range?
Do I just start tuning up the dial and keep going until I hear the same
thing or is there a
more systematic method to doing this?

The image would usually be (2 X I.F.) away from the desired signal. As an
example, if you I.F. was 455kHz, the image response would be 910kHz above
your desired frequency if you are using high-side LO injection, which is
probably the case. If the image is resulting from your 1st I.F. the
resulting response would be different. There are also other mixing spurs
that can occur, depending on how clean the your LO signal is, probably from
a synthesizer in your case. Another cause of spurs can occur from radiated
emissions from other oscillators in your receiver causing other mixing
products. In this case, PC board layout and shielding could be the cause.
Probably, the easiest way to identify these spurs is to get ahold of a
schematic diagram of the unit, that shows the intermediate frequencies; this
way, you could calculate where the images would show up.
If they are occuring at the 1st I.F. the reason is because of inadequate
front end selectivity; if they are occuring at the 2nd I.F. the reason is
because of incorrect termination of the 1st I.F. roofing filter, signal
feedaround with this filter, or 2nd LO radiation back into the 1st mixer.

Pete

"coustanis" wrote in message
...


N8KDV wrote:

coustanis wrote:

N8KDV wrote:

coustanis wrote:

For the past two nights, in the evening around 10:00 or so on the
US
east coast
on 5.065 (or was it 5.056) mHz sideband, I have heard a broadcast
that I
cannot identify. I cannot tell if it's lower or upper sideband as
my
reciever has an adjustable BFO,
not a LSB/USB switch.

It is definately aviation. It's a two way conversation of which I
can
only
make out the ground based side. I cannot make out the aircraft
side.
It sounds like instrutions of some sort but not the type you would
hear from
an approach or ground controller and anyway, it's not on standard
(civilian) tower freqs.
It's a two way conversation so it's not ATIS.
Most of the side of the conversation that I can hear seems to
consist of
LAT/LON quordinates.

That's as best as I can describe it. If you need more info, I'll
try to
listen better
so as to supply better details.

Any idea what this might be?

What radio are you using? It's always possible you are receiving an
image.

DX-390
http://www.transistor.org/collection...alistic11.html

While I'm not 100% sure I'd almost be willing to bet you are receiving
an image from
higher up in the band.

Have to try and check out that frequency range tonight.

Ok, but what range?
Do I just start tuning up the dial and keep going until I hear the same
thing or is there a
more systematic method to doing this?