Installation and Operating handbook PBU Series II Block UpConverter

Installation and Operating handbook PBU Series II Block UpConverter
Installation and Operating handbook
PBU Series II Block UpConverter
Handbook Issue 5.5, 16th March 2010
PEAK COMMUNICATIONS Ltd.
Kirklees House, 22 West Park Street
Brighouse, West Yorkshire
HD6 1DU, England
Phone +44 (0)1484 714200
Fax +44 (0)1484 723666
Peak Communications Ltd, Kirklees House, 22 West Park Street,
Brighouse, West Yorkshire HD6 1 DU England
Telephone 01484 714200, Fax 01484 723666
Internet www.peakcom.co.uk
IMPORTANT NOTE: THE INFORMATION AND SPECIFICATIONS
CONTAINED IN THIS DOCUMENT SUPERSEDE ALL PREVIOUSLY
PUBLISHED INFORMATION CONCERNING THIS PRODUCT
Peak Communications Ltd maintains a continuing programme of product improvement and
therefore reserves the right to change specifications without notice
PBUseries L-Band to SHF Band remote mounted Block Up Converter
Unit description
The PBU Series II remote mounted Block UpConverters from Peak Communications are
designed to be fully compatible with a wide range of L-Band modulators and frequency
converters. These high grade units are designed to accept the signal at L-band and provide
a further conversion to the appropriate SHF band. The PBU Series II units will connect to
any system providing the correct DC, Reference and Input parameters such as the P7000
range of frequency converters.
The output power is normally sufficient to fully drive a Power Amplifier unit and is frequency
locked to the indoor unit by the 10MHz reference typically provided by a P7000 series unit.
The unit is packaged in a diecast IP67 box with integral mounting lugs for easy mounting.
The PBU series are designed to operate over a wide range of L-Band and 10MHz power
level inputs. The unit is temperature compensated to avoid long warm up periods.
The internal construction of the unit is modular which give some flexibility in accommodating
customers’ requirements such as gain and frequency. The unit is powered from the RF cable
which carries the DC, 10MHz reference signal and L-band. Levels of these are given in the unit
specification. Where very long lengths of cable are used an additional gain can be incorporated
as an option.
The incoming RF and DC are split into their components inside the unit to give DC to power the
DRO unit and the amplifier. The 10 MHz is passed to the DRO to lock the frequency and the LBand is passed on to the mixer. At all stages the components have isolators or attenuators to
ensure correct matching is maintained. The L-band signal is combined with the LO in the mixer
and is passed out to the filter.
The bandpass filter used in this unit is a waveguide filter which gives an excellent performance
of low loss, good rejection of the LO other mixer products and a flat response. The output of the
filter is passed out to the low noise amplifier via an isolator.
The 25dB amplifier fitted is a standard low noise unit and is output via an isolator to the N-type
socket. With the losses incurred in the RF strip the gain of the whole system with the amplifier
is typically 17dB.
PBU Series II remote mounted Block Up Converter
Issue 5.5
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The third socket on the base of the unit is for an alarm cable. The alarm output is normally
configured as a summary of ‘external reference disconnected’ and ‘LO alarm’ (‘DRO out of
lock’) and ‘no power to the unit’. Special configurations are available for applications where the
user does not want ‘external reference disconnected’ to trigger an alarm.
Both the NO and NC sides of the relay are available on this connector.
The PBU series was designed to be operated, using an external 10MHz reference signal
generated by the P7000 series UpConverter or a station reference signal. This ensures the
output frequency is as accurate as the external reference and that the stability is very high. In
some cases it is not possible to supply the external reference signal to the PBU or if the
external reference signal is lost during transmission, there is an automatic reference detection
system within the unit that detects a missing reference and enables the internal reference. The
internal reference is in itself very stable and suitable for professional broadcast applications,
details of performance are provided on the data sheet.
As an option a fourth socket can be fitted which is for an external 10MHz reference and is
usually a TNC connector. The operation for the 10MHz system is the same for a standard unit
with the same alarms and internal reference detection circuitry. Also as an option the DC can
be supplied on the alarms socket. The DC and ground connections are placed on the extra
pins, as shown in the diagram. If the above options are fitted the composite arrangement of LBand, 10MHz and DC being fed up the RF cable does not apply to the unit.
Installation
Connection panel view of PBU Units
The unit has integral brackets on the box for attachment to a suitable fixture. The cables are all
connected to one face which is the shorter side and the spacing of the four 5mm holes are
80mm apart and 190mm apart. The unit is cast aluminium and will break if excessive force is
used.
Attach the N-type feed wire carrying the L-Band signal (plus 10MHz reference and DC, as
appropriate) to the socket marked ‘RF IN’. Note that in very sensitive applications a clip-on
ferrite on this line will ensure minimisation of any spurious signals. EMC tests show the unit to
be very ‘quiet’ for radiation with the highest detectable single frequency to be 50MHz.
Output of the unit is an N-type socket marked ‘RF OUT’. Check out all cables for shorts before
connecting and ensure the connections are weatherproofed. The output of the unit has an
isolator fitted which has a low DC tolerance and connecting the cables round the wrong way
may cause damage.
PBU Series II remote mounted Block Up Converter
Issue 5.5
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Notes;
• Units are normally supplied with a 5-pin alarms connector, but older units may carry a
3-pin connector which is shown in the diagram above.
• N/C (NORMALLY CLOSED) defined as; shorted to ground with no power, open circuit
when working OK.
• N/O (NORMALLY OPEN) defined as; open circuit with no power, short to ground when
working OK.
The rating of the relay contacts is as follows;
Switch Voltage (Max)
Switch Current (Max)
Switch Power (Max)
Contact resistance
Operate/release
100V
0.5A
10W
0.2 Ω
0.5 ms
Connections to a Peak P7000 series Synthesised Converter
It is recommended that connections between the Block UpConverter and the P7000 series units
are made with the connections as shown below;
Block Up Converter (with
3-pin connector)
P7000 series Alarms connector
Function
Pin Number
Function
Ground
15
Ground
N/O
11
Ext Alarm (1)
Block Up Converter (with
5-pin connector)
P7000 series Alarms connector
Function
Pin Number
Function
Ground
15
Ground
Ground (option 2)
User to supply
DC Input (option 2)
User to supply
N/O
11
Ext Alarm (1)
With this configuration a power failure or out of lock situation will give a non-grounding signal to
pin 11 of the alarms D-Type connector which will cause the summary ‘ALARM LED’ to flash and
show ‘EXT ALARM’ on the P7000 series display. See the P7000 series manual for more details
of alarms.
Operation
Refer to the specification of the Block UpConverter with specific regard to signal levels. Ensure
the TX alarm is not flashing on the P7000 series display.
All PBU series units are designed so that 950 MHz converts to the lowest SHF frequency of the
block.
For convenience an SHF frequency can be input directly on the P7000 series. Ensure the SHF
is turned ON to allow this frequency to be entered. The frequency limits will depend on the
Local Oscillator frequency set. Please refer to the P7000 series manual for details of the SHF
display facility.
PBU Series II remote mounted Block Up Converter
Issue 5.5
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With a gain of 17dB and a maximum output of +8dBm the maximum composite input power is 9dBm.
The 10MHz reference signal, if provided, should be 0dBm +/-3dB. Lock can be achieved down
to -10dBm, but this gets progressively more susceptible to interference.
The Alarm output is normally configured as a summary of ‘external reference disconnected’ and
‘LO alarm’ (‘DRO out of lock’) and ‘no power to the unit’. Special configurations are available for
applications where the user does not want ‘external reference disconnected’ to trigger an alarm.
Maintenance
The unit is maintenance free but the following should be considered.
If the unit has been opened for any reason and the unit is in a hostile atmosphere additional
sealing of the box is advised.
The only monitoring position on the DRO is the monitor pin which should read 6 volts in lock
position. Adjustment is made by the tune screw in the top of the DRO unit but the tuning is
coarse and caution should be exercised as it is possible to make the unit lock to another
frequency. For example the 12.80 GHz DRO used for the Ku band unit can be locked 50 MHz
either way. A spectrum analyser or frequency counter is required for this adjustment. On some
DRO units the tune screw is glued to prevent movement during transit.
Typical PBUseries Specification
Note this typical specification may not match exactly the specification on which a unit is
sold or the current data sheet, please see web site for latest specification.
L-Band Input
Frequency
Connection
Return loss
950-1700MHz
50Ω N-type
>15dB
Output
Frequency
Connector
Return loss
1 dB GCP
dependant upon SHF frequency range
50Ω N-type
>18dB
+ 8dBm
Transfer Characteristics
Conversion gain
17dB ±1dB at band centre
Gain stability
±0.5dB from 0 to 40°C
(-0.026dB per +°C)
Gain flatness
±1dB full band
±0.5dB across any 40MHz in band.
LO Frequency
dependant upon SHF frequency range
RF Performance
LO Phase noise
(typical with good
phase noise
10MHz ref)
-75dBc/Hz at 100Hz
-92dBc/Hz at 1kHz
-100dBc/Hz at 10kHz
-107dBc/Hz at 100kHz
-125dBc/Hz at 1MHz
Spurious
<-80dBm (in band non-carrier related)
<-75dBc (in band carrier related)
3rd Order Intercept
>+18 dBm
LO leakage
<-80 dBm (always out of band)
PBU Series II remote mounted Block Up Converter
Issue 5.5
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External Reference Input
Frequency
10MHz
Connection
Fed in on L-band cable
(option 1; separate 50Ω TNC)
Level
-10 to +3dBm
Locking delay
<2 minutes to stabilise
Internal back-up reference;
Stability
<±5 x 10-8 (0 to +60°C)
Ageing
<±5 x 10-9 per day
Mechanical
Width
Height
Depth
Construction
Weight
123mm (4.85”)
172mm (6.8”), plus connections & mounting flanges
48mm (1.89”)
Diecast Aluminium, IP67 rated
1.35 kgs (3lbs)
Environmental
Operating temp.
EMC
Safety
-25°C to +70°C
EN 55022 part B & EN 50082-1
EN 60950
Power Supply
Voltage
Current
Connection
Control Interface
Alarms
Connection
+16.5 to +35VDC
500mA nom.
Fed in on L-band cable
(option 2; Fed in on separate 5-pin alarms connection)
Summary alarm contacts
5-pin circular weatherproof (mating part supplied)
Options
1) Separate external 10MHz reference input (using a TNC connector)
2) Separate DC input connection (using a 5-pin alarms interface connector)
PBU Series II remote mounted Block Up Converter
Issue 5.5
Page 6
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