tips n tricks - nautel
TRANSCRIPT
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Tips N Tricks
Jeff Welton/Christy White
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Agenda:
• You asked for it!
• We thought of it.
• What did we miss?
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Maintenance:
- Air Filters- Hardware- Air Handling- Ground System- Housekeeping
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Air Filters:
Air Filters should be changed on a schedule, based on site conditions.
Metal mesh filters can be washed – make sure they are dry before reinstalling!
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Air Filters:AMPFET 1-10: metal mesh. Ask for the base filter, without the paint and mounting holes drilled… it’s about ¼ the price!
AMPFET 25/50 and first gen ND5/10: metal screens. These can be replaced with foam filter media with plastic guards (HAS47) but need longer screws.
ND1-10 (including ND5/10 second gen): foam filter media can be purchased in sheets online and cut to size – ask Support for media specification.
ND25/50, FM and V series – metal mesh.
Later NV, all NX, GV and NVLT series – pleated paper filters, many available through online sources. Most are MERV8, but verify specs against OEM filter.
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Hardware:- Compression connections (such as
AC entry points and circuit breaker connections) can loosen over time, as wires compress.
- Filter connections and grounds should also be checked (fan/blower vibration and heating/cooling cycles can also cause these to loosen)
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AIRFLOW DIRECTION IS CRITICAL!!!
IN
OUT
OUT
IN
Air Handling:
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Groundskeeping:Make sure ground is grounded! Remove unused cables
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Housekeeping:
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Grounding:
- Single Point- Bonded connections- Surge Protector- Use ferrite- Look for ground loops
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Transmitter Audio Rack
AC Power
Coax to Antenna
Lightning energy
Building Ground Ring
Ferrites on AC and Coax Lines
Surge Protector
Antenna Ground Radials
Station Reference Ground
Grounding:
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Single Point:
Bulkhead ground for coax cables
-Best done where cables enter building
-Connected to station reference ground
-Keep ground leads as short as
possible
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Bonding:
- All connections should be soldered, brazed or CAD welded.
- Compression connections are not ideal, they can loosen over time, or become less effective as materials oxidize.
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Bonding:
Make certain your ground IS really a ground!
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AC Power line protectors are
a must – and they MUST be
connected to your station
reference ground.
Surge Protector:
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Ferrites are good for reducing
common mode signals
-Lightning surges
-Induced RF (especially at co-
located AM and FM sites)
-Power line and power supply
noise
Ferrites:
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Ferrites:• ON the coax near the transmitter
• ON the coax near the input to the antenna tuning unit (ATU)
• ON audio cables near their termination point
only twisted pair, shielded cables should be used
• ON the AC to the transmitter
all AC phases and AC ground go through the same
ferrite
• ON the remote control cables
only twisted pair, shielded cables should be used
• ON AC cables to any external equipment
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Ground Loops:Clean up excess wiring
- previous installs
- broken connections that
were replaced.
Keep ground connections to a
minimum
- one per piece of equipment
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Streaming/AoIP:
AoIP:
- Sample rate must be 48 kHz or lower.
- Bit rates have only been tested to 384 kbps.
- Audio must be 16 bit stereo, MP3 or WAV (WAV must contain
RIF header)
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Streaming/AoIP:
Shoutcast/Icecast:
- Sample rate must be 48kHz or lower.
- Bit rates have only been tested to 384 kbps.
- Audio must be 16 bit stereo, MP3
- Server must be public
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HD Radio/DRM:
- Combining methods- Points to consider
- STL- Processing- Injection Level
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Combining Methods:
High Level - Injection High Level – Separate Antenna Low Level - Hybrid
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Points to Consider• Draw a signal flow
diagram
• Show analog and HD audio, as well as RF chain
• Don’t forget data vs. audio and include telemetry
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Points to Consider:-Infrastructure (getting either analog plus HD data or three analog channels from studio to site, as well as any RDS/PAD).
-PAD may require additional equipment/software
-Peak voltages – remember to allow 6dB margin for the digital power
-E.g.- a 10kW analog TPO, at -10dBc injection, requires components capable of 14kW…
10kW + (1kW * 4)
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Points to Consider:-STL… must handle bitrates. Must be stable with respect to dither.
-IP conflicts – use QoS routing when possible. Note IP addresses and port assignments.
-PAD data – requires generator, ports are manufacturer specific.
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Points to Consider:-Sample rate conversions… down is okay, up is bad. Avoid as much as possible.
-Audio levels can be set in board, processor, some STLs, Exporter and Exciter. Especially when using AES/EBU, keep the reference level the same throughout the chain – it helps to make troubleshooting easier.
-Audio delay can be set in the Processor, Exporter or some Exciters… determine if you want your analog running through the Exporter.
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RDS:
- Gotchas- Software
- Configuration- Current Settings vs. Preset- Network stuff
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Gotchas
• Software version
• Putting the right info, in the right places
• Active Preset
• Port 7005 & network
• Front end set-up
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Software: Can I do that?
Transmitter Software Version Static/Dynamic
VS 4.2.5* Yes/Yes*
NVLT 4.3.5 Yes/Yes
GV 4.3.3 Yes/Yes
NV 4.2.8 Yes/No
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Configuration Injection Level: 0-10%, typically 5%
- If 0%, no RDS
PI (Programme Identification) Code: 4 digit hex
- Format 0x_ _ _ _ ex. WNUG = 0x790A
PS ( Programme Service): Static station identification max 8 characters
- Hint – a space is a character ex. NUG 2016
Scrolling PS Name (if enabled): up to 64 characters
Scrolling Type: Word or Character
Radio Text: 1 – 64 characters that will display on some receivers.
- Not to be confused with Scrolling PS Name
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Preset VS Current SettingsCurrent Settings
• See the * notation
• Changes take effect immediately
Preset• Changes the main preset • Must activate changed preset
for changes to go on-air
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Port 7005 & Front End Set UpASCII over IP, open port 7005 • Is it open? Use port checker • Hung up in your network? Is it the transmitter or is the signal stuck
somewhere?
Front End Set Up• Proper configuration• How often are you sending information to the transmitter?
For more network Tips&Tricks see 2015 NUG presentation http://www.nautel.com/resources/presentations/
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We Thought of It
- Time of Day switching- Safety - Security
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Safety:
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• If a transmitter has a cover panel, LEAVE IT IN PLACE!
• Safety
• Airflow
• Circulating currents
Unless there is a note specifying it’s to be removed!
Safety:
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Security:
A very brief search
found well over
5000 broadcast
related devices
open on the
internet.
Many of these
identified the
station by call sign.
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Security:
Our AUI is not
identified by brand
name, but NX-Link is
and Burk Arc-
Connect identifies
what equipment it is
controlling
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Security:At the very least, use a router for a firewall. Assign different
ports and port forward through the router.
Ideally, tunnel in through VPN.
Do NOT use default usernames and passwords – these should
be deleted (or at least change the password to something
complex).
PW= “12345” is not complex.
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What Did We Miss?
Round Table Time:
- questions?- comments?- suggestions?
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And Remember….
Good maintenance and regular updates leave time for what’s really important!
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Thank You!
Jeff Welton
Regional Sales Manager, Central U.S.
Christy White
LPFM Specialist