[Premium-Rx] Watkins Johnson 8617B17 receiver problems

[Steve Pappin via Premium-Rx]

Hi Al,

What you are describing sounds normal. The -17 is only specified to go down 
to 500 KHz and with performance dropping below 2 MHz if it has the HFE 
pre-selector installed (see attached). The antenna section has LNAs that 
increase VHF / UHF sensitivity. There were versions of the 8617B that had LF 
up converters such as the -18. The -17 is really a lab receiver, (see 
Spencer Bahner's write up attached). He actually removed the LNAs to make 
his radios usable. It's all in his white paper on the Terry O' WEB site.

Best Regards,
Steve

----- Original Message ----- 
From: Al
To: Steve Pappin
Sent: Friday, June 26, 2015 12:39 PM
Subject: Fwd: Watkins Johnson 8617B17 receiver problems




Sent from my iPad

Begin forwarded message:


From: Al <oscar873 at aol.com>
Date: June 25, 2015 at 4:07:06 PM PDT
To: "Premium-Rx at mailman.qth.net" <Premium-Rx at mailman.qth.net>
Subject: Watkins Johnson 8617B17 receiver problems


LFE -  At the low end of the band 500khz, the spectrum trace  ramps up on 
the left.
500khz to 1.5mhz has low sensitivity. Any ideas why this ramp is there and 
the low sensitivity?
Al
Sent from my iPad 


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