[TenTec] T-T 290 Attenuator Info Pse

[Rick Williams]

I am looking at building a step attenuator similar to the Ten-Tec model 290
for my Argo V and I'd appreciate some info.  

1) Is the 290 strictly a step attenuator OR does it also have a transmitted
RF sensor circuit to switch the attenuator out during receive?

2) What are the "Six calibrated steps" of attenuation?

3) Has anyone reverse engineered the 290 and developed a schematic they'd be
willing to share?

Thanks.

73, 

Rick 
VE7TK

Website:  http://www3.telus.net/ve7tk  

(Note:  Yes I am aware that the 290 is designed for use with the Argonaut
series of 5 watt transmitters and the Argo V is a 20 watt rig!)