jeffm77
Member
I know myself, I have emailed them about the UHF issue several times, and I get no response. So, I bought a whistler to use on UHF, much much better than the 436.
BCD436HP/BCD536HP: UHF Reception Issues due to Noise from Battery Compartment
- Thread starter bearcat
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Let's move forward with what we find with our own testing. Maybe someone will find the exact source. At this point if I can fix it myself I will be more than happy. I really improved mine.
Mine works just fine on UHF Jeff and I am in Washington County not sure why you guys are having trouble. Stock antenna regularly picks up most of agh county and beyond.
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Not sure why you felt the need to put this in two posts.
Here's the thing: "Complaining about the problem" is only a very minimal part of the issue. It's like walking up to your tech support at work, handing them your laptop, and saying "It's broken, fix it. Why haven't you fixed it already?! I've already complained about the problem! IT SHOULD BE FIXED BY NOW!".
I'm not saying "we" should do all the legwork for Uniden's engineers, but as has been mentioned in many threads already, not everybody has this problem. The odds are somewhere between good and excellent that if you "complain about" "the UHF problem", you will get the equivalent of a blank stare in response. Those who took the time to explain what they were experiencing vs what they expected to experience, said they got a radio back from service with the note that "tuning" was done. I don't recall if there was any improvement noticed.
Edit: One of my HP1s "went deaf" as in complete loss of signal. It was sent to service with that description, and came back in the same condition that it left my possession in. I paid for service to tell me the radio was working OK, because I didn't do any due diligence of my own. What was wrong with it? The stock plastic antenna that comes with the HP1 had crapped out. In time, all three of my HP1s "had that problem". Except it wasn't the radio itself, and I could have shipped them all to Uniden and claimed they were not working, and gotten cranky and fed up and decided to "go to Whistler" like you, but instead I investigated a little and figured out what was wrong, and rectified it by buying new antennas.
Thrusting your radio at Uniden and saying "Unh, it broken" like a caveman does nobody any good. It powers up, it scans, it receives signals - to them, it's functioning. If you tell them what is not working properly, maybe they can help you.
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jeffm77
Member
I have noticed since the day I got my 436, on UHF analog mostly, the signals come in with static and a hissing noise. Just using the stock antennas. I can monitor the same frequencies with another scanner, such as my 396XT or even anyone of yaesu portables, with no issues.
Interesting results...
This noise floor is higher with batteries installed.
I didn't have any copper tape so I stuck on some aluminum tape just to see what happens. I tried a semi-weak DMR IFB frequency (constant audio). Without the battery cover all I get is digital noise, as soon as I put on the aluminum lined cover I get recovered audio. I can repeat it over and over.
Hmm...
This noise floor is higher with batteries installed.
I didn't have any copper tape so I stuck on some aluminum tape just to see what happens. I tried a semi-weak DMR IFB frequency (constant audio). Without the battery cover all I get is digital noise, as soon as I put on the aluminum lined cover I get recovered audio. I can repeat it over and over.
Hmm...
DMR IFB?
I thought my local traffic helicopter using an LTR trunk system for their live shots was nuts...
jeffm77
Member
So, the battery compartment is not shielded against RF leakage?
D
darunimal
Guest
Yeah any shielding a going to be better than nothing, I figure if you put it to close to the emitter (probably sd signaling/power lines/ 5v regulator) then your actually creating a antenna. So my penny solution or taped SD card maybe out, but definitely worth a try if you have a sniffer.
No and I wouldn't really expect it be...unless they suspected RF to be generated and leaking from this area. Which it seems to be.
Now to decide on whether copper tape or conductive coating is the better choice.
jeffm77
Member
Very interesting. So, the radio works well hooked up to a external antenna, but as soon as I go back to the stock antenna, the hissing and static start again.
Has any of the testing been done with aftermarket batteries compared to stock batteries?
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Was the aluminum tape on top of the foam block or under it? Maybe the metal tape needs to press against the battery for maximum benefit.
It was on top. This was just a quick and dirty test to see if it made any difference at all, and it did.
Mine was with Powerex batteries.
It's ugly, so I'd rather not.
But all I did was put some aluminum foil tape on the inside of the battery door, over the foam.
jeffm77
Member
Kevin C, did you do the whole battery door or just over the foam? I tried a piece of aluminum foil with no better results.
Please stay on the topic of shielding the battery case. I intended this thread for solving the problem. Even if we need to do it ourselves.
I mentioned in the original post that aluminum foil will not help. Go back to the first message and read the m all and then you will be up to date on these questions.
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