HAM PARTS QRO_3WAS 3 Way Active Splitter Owner’s Manual

: May 15, 2024
: HAM PARTS

Table of Contents

QRO_3WAS 3 Way Active Splitter
Product details
References
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Owner’s Manual HAM PARTS QRO 3WAS 3 Way Active
Splitter 3-WAY ACTIVE SPLITTER MANUAL

QRO_3WAS 3 Way Active Splitter

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This device is a combination of a passive 3-way splitter and a High IP3 preampliﬁer. The passive 3-way splitter splits the input signal into 3 outputs with very good matching and high isolation. The preampliﬁer compensates for the insertion losses of the passive splitter. Thanks to the variable attenuator you can adjust the gain as you need. Impedance of the splitter can be selected by jumpers 50 or 75 Ohm.
NOTE: This HW is designed only for RX line.
Jump to
Applications
Splitter
Tune and test points
Product details
Applications
Block diagram for 3-way active splitter HAM PARTS QRO 3WAS 3 Way Active
Splitter - fig Example for one antenna to three receiversExample for one antenna to RX and SDR as a skimmers Tune and test points
There are two trimmer resistors which allow you to set gain (variable output attenuator) and bias of transistor. Bias is preset to 40 mA at 13.8 V. Jumper with the test points for transistor current check and jumpers for splitter impedance switching between 75 and 50 Ohm.
3 – WAY ACTIVE SPLITTER tune & test point

Transistor BIAS setting
Current test points
Splitter impedance
Variable attenuator

HAM PARTS QRO 3WAS 3 Way Active Splitter - fig 5

Transistor BIAS setting
– this is trimmer (BIAS R4) which sets transistor bias current
– higher current means higher IP3
– recommended is 40 to 50 mA – higher currents need better cooling
– with bias current around 15 mA, the noise ﬁgure of the preampliﬁer is around 1
– for setting this bias current open jumper JP1 and measure it there
Current test points
– remove jumper (JP1)
– connect mA meter there (200 mA scale is ﬁne)
– connect supply voltage
– turn the resistor trimmer (BIAS R1) and set bias current you want
– then connect jumper short back again
Impedance of the splitter
– You can switch between 50 and 75 Ohm by the jumpers J2 and J4
Variable attenuator
– by this resistor trimmer you can set preampliﬁer gain as you need
– CW direction = higher ATT value = lower gain
– CCW direction = lower ATT value = higher preampliﬁer gain

Product details

Included in package
Splitter assembled and tested
DC plug – image
4pcs self adhesive feet pads – image

Box dimensions (mm)	100x74x29 mm – al box
Weight brutto (kg)	0.29 kg

Manufacturer:
Ing. Jan Šustr
ID 05476356, VAT CZ8407024780
Palachova 1777/7, 591 01 Žďár nad Sázavou, Czech republic, Europe
General instructions:
Please also read general instructions before handling the product.

European Union Declaration of Conformity
Manufacturer Ing. Jan Šustr (QRO.cz):
ID 05476356, VAT CZ8407024780
Palachova 1777/7, 591 01 Žďár nad Sázavou, Czech republic, Europe
declares that the assembled product:
3-WAY ACTIVE SPLITTER is compatible with the relevant Union harmonisation legislation directives:
EMC Directive 2014/30/EU
ČSN EN 61000-6-3 ed. 2
ČSN EN 61000-6-1 ed. 2 (333432)
On behalf of Ing. Jan Šustr (QRO.cz)
Ing. Jan Šustr, CEO
1st January 2023 HAM PARTS QRO 3WAS 3 Way Active Splitter - fig
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