[hpsdr] Yaesu Amp

[K1rqg at aol.com]

Steve
 
Yes, I have been using the PA/LP filter brick from a discarded FT-747 for a 
 number of years.
First with an SDR-1000 (original 3 board system 2003 era), and since  
Penelope and the rest
have been available it has been in service ever since. I use this as my  
primary rig, but some
things to be aware of. No 6 meters unless you modify the 10 meter LPF and  
then very little
drive available. I have since forgotten what it was, but not very  useful.
 
Be very careful where, when and how you apply drive to the module as it  
only takes a few
milliwatts to drive it. I use a 20 db attenuator right on the output of  
Peny, or you can disable
the final PA on Peny and take the drive from pin 1 & 3 of JP2 if you  
retain the onboard filter.
 
I also employ the T/R switching on the brick, so no need for additional  
relays. You will need
a way to source drive the LPF and you can use a neat circuit that WW2R  
devised. 
 
_http://g4fre.com/hpsdr_high_side.pdf_ 
(http://g4fre.com/hpsdr_high_side.pdf) 
 
Good luck
 
73 de Joe K1RQG
 
 
In a message dated 3/28/2011 10:48:11 A.M. Eastern Standard Time,  
snance at charter.net writes:

*****  High Performance Software Defined Radio Discussion List *****




Has anyone taken  the amp and filters from a Yaesu and used them with HPSDR 
 (Penelope/Mercury/Metis)? I searched the archives, but didn’t get any  
hits. 
I have an old FT1K  MK5 (200 watt) in storage just begging to be used for 
something  useful. 
73, Steve  K5FR 



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