> I have an inrad roofing filter installed to the PRO III. Does this > still sound like Phase Noise to you?
Yes, phase noise in your 756ProIII. The phenomena is called reciprocal mixing - the phase noise from your own synthesizer appears on any strong signal within the passband. Icom rigs are known for terrible phase noise - I have a neighbor about 1/2 mile away whose transmitted phase noise and spurs from an Icom rig and amp wipe out a substantial portion of any band he's on. 73, ... Joe, W4TV On 4/5/2014 12:51 PM, David Cole wrote:
Hi Dave (K6LL), Thanks for that thought, but I am pretty sure it is not their rigs... Here is my reasoning for why I think that: One rig is a K3, and an AL-1500, about 1/2 mile from me, and line of sight. One of the the others is a 756 PRO III, and I don't know what amp, about a half mile from me, while the third is an older Collins rig, with an older Henry amp, about 100 yards from me. All three rigs, and my mobile rig in the driveway, cause exactly the same effect when they are transmitting, the band scope, (set to something like 200 KC wide), shows perfectly straight increase across the entire 200 KC's of scope, along the bottom, as a raised noise floor would. It looks like phase noise, but I would expect that to roll off, and not be as flat as this is. I also live close to an AM station, 100KW, and about a mile and a half away, and I see almost the same thing, as I approach the station frequency. I can see the entire noise floor raise as I get closer to the station. I have an inrad roofing filter installed to the PRO III. Does this still sound like Phase Noise to you?
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