Open M/M Combine by RemoteQTH.com
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1 Open M/M Combine by RemoteQTH.com Version HW: v0.2 Doc rev.: 0.2/2014 Date: 09 / By: Jan Sustr, OK2ZAW
2 Content 1. Overview RF wiring RX principle PTT wiring Set up TX antennas stack match settings Winkey setup Stack match connection TRX setup Measurement... 13
3 1. Overview The Open M/M combine by RemoteQTH.com is the black box designed for IG9Y contest group. This box allows you to share the MAIN antenna systems (MAIN OUT connector) for RX and TX to MAIN and SUB TRX. There is also PTT interlost build in. It could be use for both SO2R or MO2R operations. I would like to thanks Dan OK1HRA for HW help and graphic and Pavel OK1MU for another support :) Technical parameters: Isolation Main-Sub (RX): IsolationMain-main, Sub-FA: Isolation Main TX, SubRX FA: Isolation Main ANT4, SubTX: Insert loss TX: Insert loss RX: DC power consumption: typ. 40dB (160m) / typ. 22dB (10m) typ. 90dB (160m) / typ. 60dB (10m) typ. 100dB (160m) / typ. 85dB (10m) typ. 85dB (160m) / typ. 62dB (10m) max. 0.08dB max. 3.4dB resp. 7dB (Main TRX, ANT4 enabled) V DC, 1A + stack match consumption
4 2. Main features RF RX: - MAIN and SUB TRX can share MAIN antenna system(s) connected to MAIN OUT port - SUB TRX can use single RX antenna input FA RX ANT - MAIN TRX can also use RX ANT4 input ( if enabled by switch on the front panel) - High power protection (low bands) - RX antennas can by selected in all combinations by small box with switches - SUB TRX can select RX antenna by rotary knob SUB RX - on the front panel RF TX: PTT: - Build in PTT interlock system allows TX only one TRX at the same time - MAIN and SUB TRXs do have the same out port MAIN OUT - Low insert loss - PTT interlock - TRX MUST be PTTed from Open M/M combine - PTT out for PA and DRV - Independent RX and TX antennas configuration on Stack Match (Stack Match is option) PTT PA - - output PTT on cinch connector use cable to connect it to your PA PTT input INH OUT - Inhibit out information (V2 will have ALC out) K3 TRX pin 7 on ACC! PTT IN - PTT in for MAIN and SUB, this is TX information PTT TRX - PTT for each TRX connected to ACC connector of TRX STACK MATCH - connector for stack match box RX SWITCH - connector for RX switch box RX ANT4 - RF connector for RX antenna input for MAIN TRX MAIN TRX - RF connector for MAIN TRX MAIN OUT - RF connector to stack match or PA SUB TRX - RF connector for SUB TRX FA RX ANT - RF connector for SUB TRX RX antenna ( far away antenna ) DC V / 1A ( + stack match power consumption)
5 3. RF wiring There is coaxial RF wiring diagram. TRX SUB and MAIN is connected by coaxial cables with PL- 259 connectors. MAIN OUT and stack match can be connected directly or you can insert PA or driver PA. Please follow pictures at: for some typical situations. FA ANT far away antenna input you can connect coaxial cable of any length with PL-259 connector. The same witch ANT4 input.
6 4. RX principle The main feature of Open M/M combine is to split RX signals from MAIN OUT RF port. There is main antenna system connected in and you can select any combinations of antennas for RX by RX switch (if the stack match is used). These RX signals are split to MAIN and SUB TRX. MAIN TRX can also use ANT4 RF input for additional RX antenna ( beverages ). SUB TRX can chose between the main system sharing or FA ant input. There could be connected far away antenna (vertical, tribander etc.) or beverages. To enable ANT4 input switch ON the small switch on the front panel. If you do not NEED it, switch it off switching ON adds 3dB of ATT into RX line!
7 5. PTT wiring If you want to use PTT interlock system as a PTT controller, than there is necessary to instert this box to the PTT way. PTT interlock system controls PTT for each TRX. If TX TRX MAIN SUB cannot and other. So for example: On SSB you can connect foot switch to PTT IN (MAIN or SUB) and head mic to TRX. If you use PC LOG voice keyer than you need to PTT from PC parallely with foot switch. Do NOT connect it to TRX directly. On CW you need to use PC and CW bug for paddle. PTT output from PC and CW bug must be connected to Open M/M combine PTT in. You can not connect paddle directly to TRX!!! PTT TRX (MAIN or SUB) should be connected to ACC connector of TRX. Example for the ICOM TRX: PTT TRX of M/M should be connected to HSEND pin 3 This will PTT TRX to TX.
8 6. Set up TX antennas stack match settings There is the red push button at the front panel. As you can see, you are able to set up all combinations of the stack match outputs. The selected combination is indicated by double flashing of RX green LEDs. TX ANT 1 to 3 respond to stack match outputs. More in the Stack Match connection chapter. For example:
9 7. Winkey setup Set up the Winkey PTT times. The Lead and Tail time set to minimal value of 40ms! This is the stack match relay protection. Or if you use PC serial com CW and PTT than set PTT ON delay to min 40 ms.
10 8. Stack match connection The stack match matrix tables: One2three stack match by QRO.cz - Stack match Inputs Selected A1 A2 A3 Balun A1 H L L L A2 L H L L A3 L L H L A1+2 H H L H A2+3 L H H H A H H H H H: +12 V / L: GND RL3FT stack match: Stack match Inputs Selected A1 A2 A3 Balun A1 L H H H A2 H L H H A3 H H L H A1+2 L L H L A2+3 H L L L A1+2+3 L L L L H: +12 V / L: GND
11 Stack match to Open M/M combine wiring: SUBD 9 pin M/M Port of: Stack match by QRO.cz Port of: Stack match by RL3FT 1 To pin 8 on SUBD - GND To pin 7 on SUBD P2.2 2 Balun Balun P2.1 3 A3 A3 P1.3 4 A2 A2 P1.2 5 A1 A1 P1.1 6 To pin 7 on SUBD To pin 8 on SUBD P2.3 7 To pin 6 on SUBD To pin 1 on SUBD P2.2 8 To pin 1 on SUBD GND To pin 6 on SUBD P *** You can use external power supply connected to 1 and 6 SUBD 9 pin FEMALE: RL3FT stack match schematic and ports:
12 9. TRX setup Because of TRX is PTTed from the Open M/M combine, there is necessary to switch OFF BK- IN, F-BK-IN or VOX (SSB). PTT in to TRX must be done from Open M/M combine otherwise the PTT interlock system would not work! And you can demage other TRX during the first one is TXing! Example: Do NOT use internal ( build in TRX) voice keyer for SSB or CW memories for CW. NEVER PTT TRX directly by pressing Transmit button or PTT on hand mic.!!!
13 10. Measurement TB
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