New 144/28 MHz transverter with dual-receiver converters that are locked to the same LO (xtal local oscillator).
   This is a proto-type unit custom made for KL7UW and being alpha-tested for DEMI.  This their new VHF transverter
   model with the addition of a second preamp-mixer for providing two separate receive channels locked in frequency.
   The new design VHF transverter was placed into production in summer of 2010. 

   I ordered the 50w model so I could directly drive my 2m-8877 amplifier without need for a intermediate amp.
   to boost drive.  I have been using 50w drive from my FT-847 to produce 1436w CW output.  The new transverter
   produces 50w in linear mode for SSB so can be driven harder up to perhaps 60w for CW.

   The unit is housed in a custom-made enclosure since the standard enclosure did not have room for the six
   coaxial connectors: TXIF, RXIF-1, RXIF-2 all BNC female, and TXRF, RX1, and RX2 all N-female.  In addition,
   are the power, PTT, ACC, and space for a future ext. reference connector.  Click on photos to enlargen:

   

















 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


 


   Specs:                                
   Model: L144-28HP-DRX
   SN: KL7UW                      
   NF and Gain: <1.0 dB @ 17 dB 
   DC Power:  11.5-15.5 vdc @ 12 A       
   PTT-L
   Sequencer - Not used due to use of external sequencer
   Cooling Fan
   Dual RX
   Drive 1.0 mw (nom)
   Output 50w linear








   Test made using Elecraft K3 measured with a Bird43 power meter using 100C element:



MEASUREMENTS:

 DRIVE
 POWER OUT
 FREQ
 VOLTAGE
 CURRENT

 

0.10
9
144.100
13.36
 7 



0.25
16
144.100
13.36
 7 



0.46
25
144.100
13.35
 8 



0.72
35
144.100
13.34
 8 



1.00
45
144.100
13.34
 8 



1.39
50
144.100
13.34
 8 



1.50
54
144.100
13.33
 8.5 



1.00
42
144.200
13.34
 8 



1.50
53
144.200
13.33
 8.5 




1.50
30
145.999
13.33
 8 



   Frequency measurements were made on the transverter running 50w. 
 

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