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DEM Part Number L23HP SN__________
1296 MHz Transverter Set For_____________________
Power Out Maximum:
Noise Figure and Gain:
DC Power Requirement:
IF Option:
Max IF Drive Level
10 MHz Source Level
Antenna Option:
Transmit Enable: Pin 5
Other Options:
Pin 9
Sequencer
Sequencer Outputs
Pin 1 (Sequencer step 1)
Pin 2 (Sequencer step 2)
Pin 3 (Sequencer step 3)
Pin 6
Ground
Pin 7
Ground
Pin 8
Ground
Other notes:
Operational Overview:
newest version of Down East Microwave's
23 cm Transverter. It is a complete new
design in a smaller package utilizing the
latest in MMIC amplifier and SAW filter
technology coupled with a standard low
phase noise synthesizer for frequency
accuracy and stability. This technology
allows a "No-Tune" performance and
function enabling the user to select a
different IF frequency range (10, 6, or 2
Meters) if desired. This design also
includes other improvements over past
versions by offering a 4 step sequencer, a
/Built/L23HP.doc
25 W linear
1.5 dB maximum @ 17 dB conversion gain
11.5 - 15.5 VDC @
Common
< 0dBm
+3dBm +/- 6dB (Always terminate the port when not in use)
Common
Ground
Pin 4
Enabled
This is the
1
10 Amp
Split
+10dBm
100 mW
Separate TX & RX
Positive Voltage
Disabled
Transmit
Open
High (750ma)
Low (100ma)
Ground
Ground
Ground
1W
10W
Receive
High (750ma)
Open
Open
Ground
Ground
Ground
12/27/2017

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Summary of Contents for demi L23HP

  • Page 1 DEM Part Number L23HP SN__________ 1296 MHz Transverter Set For_____________________ Power Out Maximum: 25 W linear Noise Figure and Gain: 1.5 dB maximum @ 17 dB conversion gain DC Power Requirement: 11.5 - 15.5 VDC @ 10 Amp IF Option:...
  • Page 2 All DEMI transverters contain the operating band within the part number, i.e., L23HP equates to the 23 centimeter band. (1260-1300 MHz) Since this is the first transverter design that has a user selectable IF frequency, we simply indicate what the transverter is “Set For”...
  • Page 3 “Configuration Options” section later in this manual or consult DEMI with your issue. If you have configured a DEMI transverter before, use the following steps as a guideline to complete your transverter install. If not, the following steps may be lengthy but are basically simple.
  • Page 4: Rear Panel View

    Remove the bottom cover plate of the transverter leaving the exposed circuit board facing “Up” After connecting the DC power cable to the power supply of choice, connect the DC POWER to the transverter. It is a twist lock. 13.8 volts is optimum but the transverter will operate normally from /Built/L23HP.doc 12/27/2017...
  • Page 5 TX circuit. The rest is absorbed in the dummy load but will radiate within the enclosure. After the transceiver power is adjusted, power off the transceiver and reconnect the IF cable to the antenna port. /Built/L23HP.doc 12/27/2017...
  • Page 6 If you are using a High Power IF drive through the antenna connector, do not assume the output power level is set to low. Verify all possibilities before increasing the output power of the transceiver. If all fails, consult DEMI with your issues before increasing the drive power beyond 10 watts.
  • Page 7 MAR3 or any MMIC that will produce around 13dB gain operating at +5VDC at the IF frequency. If more gain is required, A high gain MMIC will work with inputs as low as -20dBm. To /Built/L23HP.doc 12/27/2017...
  • Page 8 IMPORTANT NOTE: When re-testing, do not assume that since your output power of the transverter is low that it is because you do not have enough IF drive. Please consult DEMI if you have problems obtaining full output power with your new specified drive level.
  • Page 9: Frequency Of Operation

    The DIGILO is marked “0-7 Frequency Select”. The selections are listed below. Frequency of Operation Short pins 1296 = 28 1296 = 29 1,3,4,6,7 1296 = 50 0,3,4,6,7 1296 =52 3,4,6,7 1296 = 144 0,1,2 /Built/L23HP.doc 12/27/2017...
  • Page 10 DEM L23HP Component List Resistors (R) values are in Ohms and are (1206) chips unless otherwise specified. R1 100 R15 220 R29 51 R43 10K R57 10K R2 51 R16 8.2K R30 8.2K R44 10K R58 10K R3 10K R17 470...
  • Page 11 Q13 PMBT3904 F1 1296MHz(N95x) 78M09 (optional) Q14 PMBT3904 F3 1296MHz(N95x) K1 RG-1 Q15 PMBT3904 F4 1296MHz(n95x) K2 G6Y Q16 PMBT3904 IC1 MAR3 (option) K3 G5V Q17 PMBT3904 IC2 MAR6 (option) FUSE 1Amp IC12 RA18H1213G LOAD MP930 TH Thermistor /Built/L23HP.doc 12/27/2017...
  • Page 12 LOAD LNA MODULE IC12 LNA MODULES (MIGHT BE INSTALLED) /Built/L23HP.doc 12/27/2017...