Telamon wrote:
In article ,
"Tom Holden" wrote:

"Tom Holden" wrote in message
.. .
"Tebojockey" wrote in message
news On Tue, 3 May 2005 07:13:41 -0400, "Tom Holden"
wrote:

"Tebojockey" wrote in message
...
On Mon, 02 May 2005 20:50:32 -0700, running dogg

wrote:

Tom Holden wrote:

"Tom Holden" wrote in message
.. .
Noticed this last night and tonight. Is it my radio or are

others hearing the same thing? German language
transmission
booming into Toronto at 9735 from 0200 with distorted
splatter around 9845 and 9625kHz.

So it is Deutsche Welle transmitting from Bonaire. The
splatter is unintelligible but synchronised with modulation
peaks, especially strong with deep male voices. There is no
carrier that I can detect at the splatter frequencies and
SSB
reception mode does not derive anything intelligible. The
splatter spectrum seems fairly wide although the presence of

adjacent stations renders these observations difficult. I
can't think of any receiver overload or intermod process
that
would result in symmetrical splatter but I am using two
identical radios to listen to the 9735 program and one of
the
splatter sidebands so there could be a common receiver
problem. There is less interference to the splatter on 9845.

What radios are you using? My guess would be some sort of IF
problem. If both radios use the same IF then it could be
overloading the circuits and causing the problem. Some radios
can cause symmetrical splatter (as you put it) on both sides
of
the main freq, usually 910 khz below and above.



That's actually a good point. I wonder if the radios'
proximity
to each other could be causing an issue as well? If the IF's
are off, it could be a case of intermod by injection, but that

is so rare as to be a long shot.

Hope he does get back to us on what he finds.

Al in CNMI

Both radios are DX-394's. The 910 kHz offset signal would be a
2nd
IF image on one side only, and would be carrier with sidebands,
not carrier-less splatter. The splatter is there with only one
radio operating so it's not radio interaction. I sent a message
to
DW - we'll see if they reply or it clears up!

Tom



Cool! Let us know what happens. Are you still hearing it?
Like
the next day after? If so, it seems hard to believe that the DW

relay station would not be aware of it, but you may save them
some
real embarassment if you call their attention to it. Good on
ya,
Tom!

Al in CNMI

Two days in a row and not on any other station this evening. The
9735kHz broadcast schedule from Bonaire is 0200-0600UTC. I'm
hoping
someone else will check for splatter at 9845 and 9625, too. It's
01:51 UT now - I'm standing by...

Tom

There it is again - 3 days running. Interestingly, Bonaire
transmits
on 9845 almost up to 0200 but the 9735 transmitter is on with
carrier
only before 0200 and before 9845 shuts off so it's not the same
transmitter. The splatter is a little easier to detect tonight at
9850 and 9630 due to other stations coming in tonight on 9845 and
9625. Does anybody else hear it?

I just checked and did not hear the splatter around 04:00 UTC.

I noted DW went off the air for a minute around 03:59 UTC.

I have stations on 9625 and 9630 but nothing on 9845 and 9850.

DW is very strong at S10 on 9735.

--
Telamon
Ventura, California

Hmmm. Not sure that that means my radio is at fault. I flipped in the
20 dB attenuator and could still detect the peak splatter. Without the
pad, it was sometimes strong enough to kick the meter off S0.

What do you mean by S10? The S-scale runs 0-9 and then decibels above
S9. If your meter was pointing to a 10 next to S9, then that would be
S9+10dB, not an especially strong signal. As each S-unit is nominally
6dB, that would be around 60-some dB above S0. If the splatter is 80dB
below the carrier, you probably would not hear it. However, if your
meter is pinned by the carrier, that means the carrier signal strength
is greater than S9+40 or +60 dB (mine roofs at +40) and the splatter
strength would move the meter and be very audible, provided there is
not a much stronger station in the same spectrum as the splatter
energy.

I'm looking to hear from somebody who receives the 9735kHz carrier at
meter pinning strength to be certain it's the transmitter and not my
receivers. All the evidence so far weighs heavily towards the
trasnmitter.

Thanks for the report. Appreciate if you'd look again tonight.

Tom

Strong splatter from DW program relayed via RN Bonaire on 9735 KHz now heard
4 days consecutively. I hear it at and around 9845kHz and 9625 kHz, i.e.,
+/-110kHz. Pretty sure it's not caused by receivers (DX-394) because:

a) Cannot imagine what mechanism would cause symetrical intermod product
like this
b) Splatter is attenuated proportional to signal by inserting the 20dB pad
so does not behave as an overload would
c) Splatter is unintelligible, has no carrier and does not appear to have
spectral distribution conforming to a sideband so does not look like an
internal intermod product or leakage through IF filters
d) I don't observe this problem with other strong stations in the same band

To be sure, I need confirmation that someone else hears it. The transmission
schedule is 0200-0600UT to North America and you probably need to receive
9735 at needle pinning signal strength to hear the splatter. It helps to
have two radios, one tuned to either splatter frequency, the other to 9735
so you can hear the synchronisation between the splatter and the program.
DXing transmitter faults - now there's a new wrinkle to SWL!

Tom

In article .com,
"Tom" wrote:

Telamon wrote:
In article ,
"Tom Holden" wrote:

"Tom Holden" wrote in message
.. .
"Tebojockey" wrote in message
news On Tue, 3 May 2005 07:13:41 -0400, "Tom Holden"
wrote:

"Tebojockey" wrote in message
...
On Mon, 02 May 2005 20:50:32 -0700, running dogg

wrote:

Tom Holden wrote:

"Tom Holden" wrote in message
.. .
Noticed this last night and tonight. Is it my radio or are

others hearing the same thing? German language
transmission
booming into Toronto at 9735 from 0200 with distorted
splatter around 9845 and 9625kHz.

So it is Deutsche Welle transmitting from Bonaire. The
splatter is unintelligible but synchronised with modulation
peaks, especially strong with deep male voices. There is no
carrier that I can detect at the splatter frequencies and
SSB
reception mode does not derive anything intelligible. The
splatter spectrum seems fairly wide although the presence of

adjacent stations renders these observations difficult. I
can't think of any receiver overload or intermod process
that
would result in symmetrical splatter but I am using two
identical radios to listen to the 9735 program and one of
the
splatter sidebands so there could be a common receiver
problem. There is less interference to the splatter on 9845.

What radios are you using? My guess would be some sort of IF
problem. If both radios use the same IF then it could be
overloading the circuits and causing the problem. Some radios
can cause symmetrical splatter (as you put it) on both sides
of
the main freq, usually 910 khz below and above.



That's actually a good point. I wonder if the radios'
proximity
to each other could be causing an issue as well? If the IF's
are off, it could be a case of intermod by injection, but that

is so rare as to be a long shot.

Hope he does get back to us on what he finds.

Al in CNMI

Both radios are DX-394's. The 910 kHz offset signal would be a
2nd
IF image on one side only, and would be carrier with sidebands,
not carrier-less splatter. The splatter is there with only one
radio operating so it's not radio interaction. I sent a message
to
DW - we'll see if they reply or it clears up!

Tom



Cool! Let us know what happens. Are you still hearing it?
Like
the next day after? If so, it seems hard to believe that the DW

relay station would not be aware of it, but you may save them
some
real embarassment if you call their attention to it. Good on
ya,
Tom!

Al in CNMI

Two days in a row and not on any other station this evening. The
9735kHz broadcast schedule from Bonaire is 0200-0600UTC. I'm
hoping
someone else will check for splatter at 9845 and 9625, too. It's
01:51 UT now - I'm standing by...

Tom

There it is again - 3 days running. Interestingly, Bonaire
transmits
on 9845 almost up to 0200 but the 9735 transmitter is on with
carrier
only before 0200 and before 9845 shuts off so it's not the same
transmitter. The splatter is a little easier to detect tonight at
9850 and 9630 due to other stations coming in tonight on 9845 and
9625. Does anybody else hear it?

I just checked and did not hear the splatter around 04:00 UTC.

I noted DW went off the air for a minute around 03:59 UTC.

I have stations on 9625 and 9630 but nothing on 9845 and 9850.

DW is very strong at S10 on 9735.

--
Telamon
Ventura, California

Hmmm. Not sure that that means my radio is at fault. I flipped in the
20 dB attenuator and could still detect the peak splatter. Without the
pad, it was sometimes strong enough to kick the meter off S0.

What do you mean by S10? The S-scale runs 0-9 and then decibels above
S9. If your meter was pointing to a 10 next to S9, then that would be
S9+10dB, not an especially strong signal. As each S-unit is nominally
6dB, that would be around 60-some dB above S0. If the splatter is 80dB
below the carrier, you probably would not hear it. However, if your
meter is pinned by the carrier, that means the carrier signal strength
is greater than S9+40 or +60 dB (mine roofs at +40) and the splatter
strength would move the meter and be very audible, provided there is
not a much stronger station in the same spectrum as the splatter
energy.

I'm looking to hear from somebody who receives the 9735kHz carrier at
meter pinning strength to be certain it's the transmitter and not my
receivers. All the evidence so far weighs heavily towards the
trasnmitter.

Thanks for the report. Appreciate if you'd look again tonight.

By S10 I shortened S9+10dB.

That's about -60 dBm or about 1 nW on my radios. I don't generally get
signals larger than S9+10dB. That is strong enough for me to turn up the
volume as loud as I want and not hear any background noise or hiss.

--
Telamon
Ventura, California