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Re: Topband: Receivers, Noise Blankers and Key Clicks

To: Top Band List List <topband@contesting.com>
Subject: Re: Topband: Receivers, Noise Blankers and Key Clicks
From: Steve Lawrence <smlx@earthlink.net>
Date: Wed, 4 Feb 2004 12:29:27 -0800
List-post: <mailto:topband@contesting.com>
On Feb 4, 2004, at 8:25 AM, Barry N1EU wrote:

I'll let Mike answer, but I was assuming he was referring to the original FT-1000, NOT the MP/MkV. I've heard many FT-1000(D) transmitters on the air that have been burdened by noisy sidebands, and sometimes low level discreet spurs.

73,
Barry N1EU

*************************************************

In October 2002 I posted a message on the Yaesu reflector about a buzz / phase noise sound on receive in my FT1000D at turn-on on 28020 and other 10m frequencies and also to a lesser extent on 12m. The fix I recommended was to tighten the circuit board screws on the filter board accessible by removing the top cover and then lifting the shield up from the board for access. Unfortunately, the problem returned shortly after that posting. A firm fist on the right side and to the rear of the radio would just about clear the problem until the AC power was cycled.

I subsequently found the permanent fix and posted it in February 2003. After removing the top and bottom covers, I found that the screws holding the RF board and the Sub RX board — both on the right side of the radio where my fist had been effective — were simply sitting in place with essentially no torque. I tightened these screws and any others, top and bottom that I could easily see. Although tempted, I left the screws holding down the PA transistors alone!

The problem has not returned in the past year. After nine years, screws loosened or were never tight to begin with or both.

CAUTION: Disconnect all power when attempting this. YMMV.

I post it here as part of the discussion because poor internal grounding, in my case from loose screws, can contribute to a variety of problems including noise.

73, Steve WB6RSE


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