RCI 9515 Splattering?
 

I seem to be hearing RCI's 9515 kHz transmission up above the assigned
frequency all over the place. Anyone else notice?

Tim Brown

In article , Tim Brown
writes:

NOpe, not here;
put in USB,
9.515 is where it's transmitting from
( - But transmitting real Ookey music..!)

Dan



Subject: RCI 9515 Splattering?
From: Tim Brown
Date: Fri, 26 Dec 2003 09:30:31 -0500

I seem to be hearing RCI's 9515 kHz transmission up above the assigned
frequency all over the place. Anyone else notice?

Tim Brown

Yes. Bad splatter in SE Michigan. Down about 100 kc and above about
300 kc.

Jim


On Fri, 26 Dec 2003 09:30:31 -0500, Tim Brown
wrote:

I seem to be hearing RCI's 9515 kHz transmission up above the assigned
frequency all over the place. Anyone else notice?

Tim Brown

I did as well yesterday, I thought it unusual because it's never happened
before. I looked at the signal and I was getting almost 60 over but I have 2
5000 watt mw radio stations with 2 miles as the crow flies and none of them
give me any interferance. I even attenuated the signal down 20 db and I was
getting it on all my receivers. So something was going on.

I think RCI maybe getting a little lax in the engineering dept.

73's
Rick

Drake R8 R8B
ICOM R75
Yaesu 7700
Hammarlund SP-600-JX-17

"If you try to fail and succeed, which have you done?"

"R.F. Collins" wrote in message
...
Yes. Bad splatter in SE Michigan. Down about 100 kc and above about
300 kc.

Jim


On Fri, 26 Dec 2003 09:30:31 -0500, Tim Brown
wrote:

I seem to be hearing RCI's 9515 kHz transmission up above the assigned
frequency all over the place. Anyone else notice?

Tim Brown

Tim Brown wrote:

I seem to be hearing RCI's 9515 kHz transmission up above the assigned
frequency all over the place. Anyone else notice?

Tim Brown

I can recall times in the past when RCI has had problems with 9515.

RCI does seem to have a bit of a problem at the present time with either
spurs or transmitter mixing products with several of their transmitters.

Steve
Holland, MI
Drake R7, R8 and R8B

http://www.iserv.net/~n8kdv/dxpage.htm

Diverd4777 wrote:

In article , Tim Brown
writes:

NOpe, not here;
put in USB,
9.515 is where it's transmitting from
( - But transmitting real Ookey music..!)

Dan



Subject: RCI 9515 Splattering?
From: Tim Brown
Date: Fri, 26 Dec 2003 09:30:31 -0500

I seem to be hearing RCI's 9515 kHz transmission up above the assigned
frequency all over the place. Anyone else notice?

Tim Brown

Could they be testing IBOC?

Greg Baker

GB,

Anyone - CORRECT ME, IF I AM WRONG (CMIIAW).

International Shortwave Broadcasters are Testing and Using DRM Technology.
(Using two "Separate" Frequencies for normal AM and the DRM signals.)

"Only" AM & FM Broadcasters in the USofA are Testing and Using IBOC
(Using the 'same' "Center Reference" AM & FM Station Radio Frequency
for both normal AM or FM and IBOC Signal.)

ihbwb... ~ RHF
= = = I Have Been Wrong Before... Butt Usually I Am Right-On !
..
..
= = = Gregory Baker
= = = wrote in message hlink.net...
Diverd4777 wrote:

In article , Tim Brown
writes:

NOpe, not here;
put in USB,
9.515 is where it's transmitting from
( - But transmitting real Ookey music..!)

Dan



Subject: RCI 9515 Splattering?
From: Tim Brown
Date: Fri, 26 Dec 2003 09:30:31 -0500

I seem to be hearing RCI's 9515 kHz transmission up above the assigned
frequency all over the place. Anyone else notice?

Tim Brown

Could they be testing IBOC?

Greg Baker

In article , Tim Brown
wrote:

I seem to be hearing RCI's 9515 kHz transmission up above the assigned
frequency all over the place. Anyone else notice?

Tim Brown

After posting this originally, I went back to the receiver to check
their modulation envelope with my 'scope to see what was going on.

What I noticed was that peak negative modulation was -not- reaching 100
percent. Maybe they were getting 75 to 80 percent peak negative
modulation, indicating that the carrier was not getting cut off. No
harmonic emission was noted at the 2nd harmonic of the 9515 carrier
frequency (19030 kHz).

My guess is that something blew in the transmitter's pulse step
modulator unit causing modulation steps to be missing, resulting in the
lack of complete or full modulation in the negative direction. This
would cause emission to occur at frequency multiples of the missing
"steps" period. I don't know what the switching frequency of the PSM
unit in the ABB transmitter is (anyone know?).

While I was watching the 'scope, it sounded like someone up there was
futzing with modulation levels apparently trying to correct the
situation. If it was my operation I would have immediately pulled the
plug due to the substantial interference it was causing. I guess this
underscores the necessity of using a spectrum analyzer to monitor your
transmitter's output if it employs a pulse type modulator. Mod monitors
are nice but they don't tell you what is going on off frequency.

Tim Brown