[Kenwood] TS-440 Phase Noise

[Robert Needleman]

Ken,
Doubt there’s a specific way to reduce phase noise in the 440, but in the older synthesized KW rigs, it helps to reduce sensitivity by backing off the RF gain and throwing in low level RF attenuation, especially on the low bands. I have a TS-450 and I’m able to reduce noise quite well by that maneuver.
Bob K3AC

Sent from my iPhone

> On Dec 18, 2020, at 1:19 PM, ken.d.brown at hawaiiantel.net wrote:
> 
> The TS-440 is a nice radio, but compared to more recent rigs it has high phase noise. This raises the receiver noise floor when operating in crowded conditions, such as in a contest, and can also cause interference to others when transmitting. I wonder if anyone has done any work to try to improve the phase noise in a TS-440? I am guessing that some time constants could be changed in one of the PLL loops to reduce the phase noise, but there would be some kind of trade off. Perhaps tuning across a band would be slowed down or TX/RX changeover time would be increased. If you know of any such attempts to reduce phase noise on a TS-440 please tell me, or tell me who to talk to.
> 
> Thanks, Ken N6KB
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