DZ Sienna Service Manual

Page DZKit SERVICE MANUAL SIENNA HF REcEIVER/Transceiver Price: $30.00 DZ CompanY • LOVELAND, COLORADO

Page 10 Frequency range: 10 kHz to 30 MHz (Specs valid 500 kHz-30 MHz) Modes: SSB, CW, AM, FM, (Digital via optional embedded PC) FM modulation: freq

Page 11 Theory of Operation The Sienna HF transceiver is organized into five major blocks: • DC Power conditioning (DCD board) • Control (Controll

Page 12 motive relay, to open, which removes power. When the comparator outputs are both high, pul-lup resistor R14 assures that Q2 will be on, enab

Page 13 raw input voltage on the audio output amplifiers in order to allow them to handle the very high instantaneous currents (up to an amp!) needed

Page 14 Control: Controller, Front Panel and VFD Boards The main Controller board is the heart of the Sienna. An Atmel Mega644P microcontroller (U9)

Page 15 user (the mic’s /PTT) or when the Keyer is controlling it. An output port bit, PTTO, or the Keyer, via PTT_Keyer, are used to generate LTxEn,

Page 16 port C or has been accepted from port C. Q12 provides a Frequency Update pulse for all DDS chips. A4 and A5 are address lines for the DDS chi

Page 17 Note that a similar switch is not needed for the RXVFO, because it operates at a much higher frequency range of 70-100MHz. Any harmonics of

Page 18 The dot paddle and dash paddle inputs are filtered and fed to two edge-driven interrupt lines (port D, bits 2 and 3). The manual key input is

Page 19 (U20/U21 on Sheet 8 of the RXBPF board) is allocated as a bypass. This circuit represents the DZKit exclusive Passive Signal Boost (PSB)TM. B

Page 2 DZ COMPANY CONTACT INFO Orders, parts, phone assistance...(970) 667-7382 E

Page 20 Receiver second IF The 70MHz 1st IF output of the Darlington driver feeds U8, another TUF-3 mixer, along with LO2 from the controller set to

Page 21 tweaked so that the loss through the IF Filter board is about the same regardless of the loss characteristics of the various filters. The cr

Page 22 the input offset and input bias current of the op-amp do not add a DC offset to the small AGC voltage. U27 (pins 1,2,3) multiplies the AGC v

Page 23 This is one thing that enables high speed QSK (full break-in) operation. There’s one other thing that must be done during non-full-duplex tr

Page 24 ers. However it can cause the receiver to have higher pitch than may be comfortable. The solu-tion is to mute the receiver and use the line o

Page 25 a calculated value and depends on the meter function that is selected (SWR, Forward Power, PA Volts, etc.).

Page 26 Transmitter: Transmitter, TxBPF and 100W PA boards Refer to the block diagram on page xxx and schematics starting on page xxx. The transmit

Page 27 off. In FM mode, the key is turned on and TXBFO is frequency modulated based on the amplitude of the sampled microphone input. SSB/AM filte

Page 28 is identical to the ones used on the RXBPF board for the receiver discussed earlier. The only difference is that the TXBPF board selects the

Page 29 T/R switch and low pass filters The 10W output from T5 is fed into one of five low pass filters shown on Sheet 7. If the 100W amplifier is n

Page 3 Service Manual for the Sienna HF Transceiver DZ COMPANY LOVELAND, COLORADO Copyright © 2011 The DZ Company., LLC

Page 30 Amp bypass Sheet 2 is the heart of the 100W amplifier. A 10 Watt input signal can either be fed to the am-plifier or it can be switched dire

Page 31 in the secondary is thus about 3 Amps rms. Stability filter and T/R switch RF appearing at K3 is routed to a high pass filter consisting of

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Page 33 Insert block diagram page here

Page 34 Schematics

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Page 4 TROUBLESHOOTING Thenicethingaboutbuildingyourowntransceiverisbeingabletofixitifitbreaks,ortofigureoutwhyit’snotworking

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Page 5 Symptom PossibleCauses Fix5vSupplyreadslow,frontpanelseemslockedupC24onDCDboard MakesureC24ismountedtherightdi‐rection

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Page 6 VOLTAGE, RESISTANCE CHARTS Measurementpoint VoltageJ10pin1 5.0V+/‐.15VJ10pin2‐9.5V+/‐.5VJ10pins3and5 0.0V+/‐.05V(ground)J

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Page 7 Pin Voltage(+/‐5%)J5pin1 +5.0VJ5pin2‐9.5VJ5pin4 +11to+15VJ13pin4 9.0VTP3 >4.0VU14pin1‐5.0VU13pin3 +5.0VU18p

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Page 8 Pin Voltage Mode ModeCommandsMenusettingJ18pin1(right) 5.0V  J5pin5(bottom) VCC  U18pin3(top) 10.0V  T

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Page 9 Pin Voltage Mode ModeCommandsJP7(left) 1.4VTransmitterkeyedQ3base(leftpin) 1.2VTransmitterkeyedQ3emitter(rightpin) 0.

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Page 98 DZ COMPANY UNIQUE electronic equipment in kit form LOVELAND, COLORADO