SB-110a help

[Mark Graalman WB8JKR]

 You should get CW power output, the CW carrier
oscillator signal is injected after T-5, do you get
output in the CW mode?

Mark  WB8JKR


On Thu, 27 Jan 2005 12:25:45 -0500 Dave Leisman <wb8baf at VOYAGER.NET>
writes:
> I have a Sb-110a and need some help with the transmitter.  
> Thereceiver 
> is one of the best I have heard, even rivaling another 6meter rig in 
> 
> the shack, but for some reason I can't get the transmitter to work.
> 
> I am using an HP-23 power supply running through a bird wattmeter 
> and 
> into a Cantenna.  I am using a Tektronics scope with a Hewlett 
> Packard 
> signal generator in addition to a normal DVM.  All the voltages and 
> 
> resistances check ok or within nominal ranges when compared to the 
> manual.
> 
> I have measured the rf coming from the LMO during transmit and have 
> a 
> strong signal, no problem.  Good signal through the early stages up 
> to 
> the balanced modulator which is where it gets touchy.  I get a 
> signal 
> up to primary of T-5 on the Carrier Generator board, but nothing on 
> the 
> secondary side of the transformer. I check continuity between the 
> associated pins of T-5 (pins 1 to 2, and pins 3 to 4)and all seems 
> well 
> and there doesn't appear to be a short grounding the signal to the  
> 
> outer can.
> 
> The band pass filter works just fine, and the tubes are all in good 
> 
> shape too.  
> 
> But this situation with T-5 is a mystery to me and is keeping this 
> great rig off the air.
> 
> Anyone have any suggestions?
> 
> Dave, W8QW
> -- 
> CoreComm Webmail. 
> http://home.core.com
> 
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