QSK 2500 User Manual
Contents
1. RF OUT antenna Figure 2 RF Connections back 12 2 15 Page 8 of 11 DxConnection frontier com 17 25 volts DC power to QSK Key Paddle jack input to QSK Xcvr Key Paddle jack Figure 3 Circuit for power switch set to Bypass Amp relay control Amp out B Xcvr relay control Amp in B Xcvr Figure 4 RF circuit in receive amp off states 12 2 15 Page 9 of 11 DxConnection frontier com Example QSK 2500 interface to AL 811H Amplifier TO ANTENNA OR ANTENNA TUNER iv O O 160 ALC amp Bil FUSES o Oo ADJ 12A 120V BA 240V ALCOUTO alt o 4 NES AMERIT RON o 15 17 EG Q AL 811H AA POWER PLUG EAN SNITT IER OR TRANSCEHN ER TO EARTH GROUND Figure 5 AL 811H without QSK 2500 12 2 15 Page 10 of 11 DxConnection frontier com AL 811H amplifier f Relay transceiver QSK 2500 front Relay key paddle ker key paddle back in out In Key paddle xcvr Oo Figure 6 AL 811H Relay connections AL 811H amplifier transceiver back QSK 2500 back RF OUT og RFIN RF OUT ANT antenna Figure 7 AL 811H RF Connections ALC cable is unchanged 12 2 15 Page 11 of 112. IC 735 10ms Table 2 Changing QSK timing delay Optional Jumper 2 adjacent holes together They are next to the PIC16F676 pin specified in table factory setting no jumpers jumper add 1 jumper jumper add 1 jumper jumper jumper add 2 jumpers jumper add 1 jumper jumper jumper add 2 jumpers jumper jumper add 2 jumpers jumper 12 2 15 jumper jumper add 3 jumpers Page 6 of 11 DxConnection frontier com QSK 2500 Block Diagram 927 15 rs bypass 1 r switch dit l paddle sto default 10ms add hang time key amp relay 2 to 10 sec Base default 3 sec timing RF detect Key or computer ee oe ee oe ee ee oe dah delayed 1 i i i I I i I I dit delayed I I 1 I f i I if i amp key out amp key in amp T R relay go GO OD SO ee ee ee ee ee ee 12 2 15 Page 7 of 11 DxConnection frontier com amplifier transceiver OSK 2500 front Pwrin Amp Key key paddle key paddle xcvr key paddle IN Amp Key O out In 00 I I AE ZZ 2 to 200 VDC to gnd or 2 to 200 VDC to gnd 100ma max key paddle keyer DC power 17 25 volts computer bug etc 200 ma stereo jack Figure 1 Control Connections QSK 2500 front amplifier back transceiver back QSK 2500 back XCVR RF IN RF OUT ANT
3. of a transmission the amplifier is held keyed for a short time to prevent excessing switching of the amplifier T R relay The nominal factory setting is for a 3 sec delay which satisfies most users Faster CW operators tend to want shorter delays and slower operators tend to want longer delays This setting is not critical and is mainly a user preference It does not affect QSK receive or transmit timing A 20 turn screw adjustable potentiometer is located next to the PIC16F676 chip see Figure 1a below It allows setting the delay from 2 sec to 10 sec After adjusting the potentiometer the QSK2500 must be switched off and back on for the adjustment to take affect Also see video Adjusting QSK 2500 Delays high resolution Rev YouTube Method 1 The safe method is to adjust the potentiometer a few turns with the QSK unit turned off and then turn it on to see how the delay time has changed Be sure to remember or write down the direction of the adjustment and the number of turns so you can estimate which direction to turn the potentiometer screw the next time and how many turns The adjustment is approximately linear Method 2 Be careful to not short any of the PIC16F676 pins The delay can be set with the QSK unit powered up by measuring the voltage on pin 8 of the PIC 16F676 and according to the following formula Potentiometer voltage desired delay in sec 2 0sec 10 1sec 5 Ovolts Remember The QSK unit must switched off for
4. the delay change to take affect 7 Optional Key Paddle Delay timing The factory setting for the delay from the QSK2500 Key Paddle Input jack to the key paddle Xcvr Output jack is 10ms This value is suitable for most amplifier transceiver combinations The user is encouraged to use this setting unless this delay is known to be too short Table 2 below shows that by adding the appropriate solder jumpers the timing can be adjusted from 3ms to 16ms There are pairs of holes located next to pins 2 3 and 4 of the PIC16F676 for the jumpers see Figure 1a below 1 4 bare 22 solid wire makes a suitable jumper The delay should not be lowered below 10ms unless test equipment is available to assure hot switching of the amplifier T R relay does not occur at the start of the first dit or dah of each transmission See Adjusting QSK 2500 Delays high resolution Rev YouTube Note Many commercial external QSK units including PIN diode types do not protect against hot amplifier T R relay switching at the start of the first dit or dah of each transmission 12 2 15 Page 4of 11 DxConnection frontier com 8 Limited Warranty The QSK 2500 is warranted to be free of defects in materials and workmanship for 1 year to the original purchaser This limited warranty is for either the repair or replacement of the QSK unit only There is no coverage for anything other than the QSK unit This warranty is exclusive of abuse misuse accidental damage acts
5. voltage polarity A 17 to 25 volt 200 milliamp wall wart type DC power supply connects to the Pwr In jack on the front panel The power supply requires a 2 1 mm power plug center positive See this video for an example Adding QSK to unmodified Ham Radio Amplifier YouTube 4 Example Interface to Ameritron AL 811 amplifier series The QSK 2500 interface to the Ameritron AL 811 series of amplifiers is shown in Figures 5 6 and 7 5 Operation The QSK power switch places the unit in either a AMP mode or b ByPass mode In AMP mode the QSK unit is active and performs the expected switching of the RF signal The QSK unit must be in AMP mode anytime that the amplifier is to be used regardless of the operating mode i e SSB CW RTTY PSK etc If the amplifier is not to be used then the QSK unit can be set to ByPass mode which turns it s DC power off and routes the Key Paddle input jack to the Xcvr Key Paddle output jack See Figure 3 The OSK unit can be set to AMP mode for transceiver only operation if the amplifier power is turned off or the amplifier key input is disabled Some amplifiers can be disabled by a switch on the front panel For this case it is not necessary to set the QSK unit to ByPass to operate without the amplifier However the amplifier RF ports must remain connected to the QSK unit 12 2 15 Page 3 of 11 DxConnection frontier com 6 Adjusting Amplifier Keying Delay After the last dit or dah
6. DxConnection frontier com DX Connection QSK 2500 Instruction Manual DX Connection QSK 2500 Amp Bypass Key Paddle Amp Key f oe Power Out In Key Paddle Xcvr y p 600 1 Description The DX Connection QSK 2500 allows operating a non QSK amplifier in OSK mode with no amplifier modifications No amplifier T R relay interface is required The QSK unit will interface to amplifiers whose key jack presents less than 200 volts positive or negative polarity to the QSK unit The QSK 2500 adds a nominal 10 ms delay to the transceiver s normal RF delay to eliminate hot switching of the amplifier s internal T R changeover relay before the first dit or dah of atransmission After the first dit or dah the amplifier remains keyed up for the remainder of the transmission preventing excessive T R relay switching The QSK 2500 returns the amplifier to standby 2 sec to 10 sec user settable following the last dit or dah of a transmission The QSK unit incorporates hot switching T R relay protection caused by some transceivers removing the amplifier key signal before the RF envelop has decayed The QSK unit senses for RF on the amplifier RF input connector and only switches from Transmit to Receive when the RF envelop is no longer present A functional block diagram is included later in this manual The QSK 2500 Key Paddle input jack accepts a straight key an external keyer a bug a paddle to use the transceiver s internal key
7. er computer generated CW or anything that keys the transceiver by grounding a circuit s The input device must sink about 1 ma to ground and accommodate 5 volts open circuit These requirements are compatible with transceiver s Key Paddle Input jack requirements 2 Specifications a RF Power 2500 Watts CW SSB Data modes b Antenna VSWR lt 1 5 1 at2 5KW lt 2 5 1 at 1 5KW lt 3 0 1 at 1 250KW c RFlosses almost lossless relays much less loss than PIN diodes silver plated SO 239 connectors d QSK internal relays acoustically quieted and sealed for quiet operation e No hot switching of QSK internal relays f Provides T R relay high voltage interface for both new and older amplifiers The QSK 2500 input presents a 5VDC 1ma signal to transceiver Amp key jack The QSK 2500 output keys to ground 12 2 15 Page 1 of 11 g h DxConnection frontier com amplifier T R relays up to 200VDC and 100ma No need for MFJ ARB 704 or Jackson Harbor Keyall Interface Amplifier TX to RX hot switching protection QSK unit returns to Rx mode only after the RF envelop has decayed preventing hot switching the amplifier T R relay Amplifier RX to TX hot switching protection QSK unit adds nominally 10ms see next item of delay to the transceiver s internal 5 to 15ms time delay see Table 1 below before the start of the transceiver RF envelop output The 15 to 25ms total time delay allows the amplifier T R changeover relay ample time to
8. o use the Kenwood transceiver 12VDC Amp Key output signal Contact DX Connection for information 1 year Limited Warranty XCVR AMP AMP OUT _ a ERI ev Mn ie gt 12 2 15 Page 2 of 11 DxConnection frontier com back view 3 Interconnections The Control interconnections are shown in Figure 1 The RF interconnections are shown in Figure 2 Referring to Figure 1 the CW input device i e key paddle bug computer keyer etc connects to the n Key Paddle stereo input jack on the QSK unit For single line input devices such as a key keyer bug computer CW etc a stereo jack must still be used The center pin is used for CW the sleeve is left unconnected Paddles connect to the center pin and the sleeve in the normal manner dit center dah sleeve The delayed CW appears at the Xcvr Key Paddle mini stereo jack on the QSK unit This jack connects to the Key Paddle input on the transceiver The transceiver s Amplifier Key jack connects to the AMP Key IN phono jack on the front of the QSK unit The transceiver keys to ground a 5VDC 1ma signal from the QSK unit Contact DX Connection to use Kenwood s 12 VDC for amplifier keying The QSK s AMP Key OUT phono jack connects to the amplifier s AMP Key IN or antenna relay T R relay or transmit input as shown in Figure 1 It keys the amp T R relay to ground No QSK setting changes are required for keying either positive or negative amp T R relay
9. of God or consequential damages etc A DX Connection Return Authorization RA is required for warranty service Email or mail a copy of the purchase receipt and a description of the problem to DX Connection to obtain a Return Authorization Upon receipt of the Return Authorization return the unit shipping prepaid to DX Connection DX Connection will pay return shipping 73 Contact DX Connection email DxConnection frontier com W Rodgers K3HZP phone 260 432 8223 5727 Buckfield Court Fort Wayne IN 46814 website http qsk2500 myfreesites net YouTube video 1 Adding QSK to unmodified Ham Radio Amplifier YouTube YouTube video 2 Adjusting QSK 2500 Delays high resolution Rev YouTube YouTube Video 3 QSK2500 TR RelayTiming YouTube DX Connection OSK 2500 Bypass a 4 Key Fgddle oa Bar br i sd gt lt atle Xevr ti tat w s Figure la Delay potentiometer amp jumper holes adjacent to PIC processor 12 2 15 Page 5 of 11 DxConnection frontier com Table 1 Total time for Amp T R relay to switch total T R actuation factory delay setting 10ms comment time longer settings in Xcvr QSK 2500 key delay factory setting transceiver transceiver dd RF delay Yaesu FT 1000MP MKV Elecraft K3 Kenwood TS 480 TS 2000 TS 590S TS 590SG Icom IC 7000 Yaesu FTDX 9000 FT 2000 TenTec Omni VII amp Orion I II Ten Tec Eagle ICOM IC 706 MKlIg IC 756 PRO PRO II IC 746 PRO ICOM
10. switch to TX prior to the first dit or dah of each transmission The amplifier remains keyed after the first dit or dah of each transmission preventing excessive T R relay switching during the transmission QSK timing delay The Key Paddle output to the transceiver is delayed 10ms from Key Paddle input with the factory settings This should accommodate almost all transceiver ambplifier combinations However solder jumpers are provided to adjust this timing delay from 4ms to 16ms to accommodate custom transceiver amplifier timing requirements Amplifier keying delay following the last dit or dah of a transmission User adjustable from 2 sec to 10 sec factory setting 3sec Duty cycle continuous duty DC power input 17 to 25 volts at 200ma max 120VAC power block included Two LED indicators Power On green Transmit red Acoustically quieted sealed relays for quiet operation Key Paddle input jack 1 4 stereo Xcr Key Paddle output jack 1 8 mini stereo Amp Key IN phono jack 5VDC open 1ma transceiver keys to ground Amp Key OUT phono jack keys Amp T R relay to ground Accepts T R relay voltages 2 to 200 VDC or 2 to 200 VDC 100ma max Power jack 2 1mm male center positive Size 5 in W x2 in H x 3 in D excluding SO 239 connectors Weight lt 1 lb Optional cables Standard mini stereo and RCA cables are available in 3 or 6 foot lengths Specify cable type for availability and price Factory option t
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