[VHFcontesting] DEMI 1296 transverter drive power

[Lee Scott - AA1YN]

At 12:32 PM 10/2/2004 -0400, Bill Burgess wrote:
>I have an earlier level DEMI 1296 transverter, serial # 105 without any 
>information on it.  I want to drive it with either a Kenwood 700A or Yaesu 
>480R, each being approx. 10 watts output and neither having a low power 
>setting for ssb/cw.  I need to know the safe drive level for this 
>unit.  Also, for those better than I in db calculations, will a 15 db 
>attenuator in the drive transmit line be sufficient, or do I need more?
>
>73,
>
>Bill
>
>Email: ve3cru at rac.ca
>
Hi Bill,

It all depends on the options it was built with.  There is an option for 
1-10w input and this can be identified by a high power (35w) 50 ohm 
resistor on the transmit side of the IF.  A lower power input version has a 
220 ohm resistor network and a still lower power input has maybe a couple 
of resistors.  You need to open your transverter and look at the IF side of 
things to determine which transmit drive option you have. without that 
info, no one could guess as to the attenuator you need.



Lee Scott - AA1YN
Home of the VHF & Up Register http://www.aa1yn.com/vhf
Hooksett, NH
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