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Post by oldgeezer on Jul 11, 2019 23:37:26 GMT -5
I have a neighbor somewhere with some electronic device that trashes the entire CB band thru 10 meters. It has a large signal on my Yaesu ham radio waterfall spectrum display and no amount of noise limiter rids the noise on the Yaesu. My Courier 23 Plus radio hears the noise quite loud, but a reasonably strong signal does over-ride the noise. It does a better job vs the Yaesu ham transceiver. Now, the Knight KN-2565B somehow barely hears the noise and CB signals comes thru well. The Knight is not as sensitive as the stellar Courier, but hears about everything the Courier hears.
I have no idea why the Knight KN-2565B removes the noise and it does not have a noise limiter switch. If you have the same noise issue as myself, get a Knight KN-2565B.
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Post by tubefan on Jul 12, 2019 7:50:38 GMT -5
The noise is most likely those wifi repeaters to get the wifi signal through the ground wire of the AC outlet. Have seen it local. It can stop your cb hobby dead in its tracks.
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Post by 321 treeclimber on Jul 12, 2019 8:00:51 GMT -5
But if you a ham you can legally make them fix the problem. As a licensed operator you have legal right to clean and clear communication KD2RYS
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Sandbagger
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Post by Sandbagger on Jul 12, 2019 11:46:19 GMT -5
I have a neighbor somewhere with some electronic device that trashes the entire CB band thru 10 meters. It has a large signal on my Yaesu ham radio waterfall spectrum display and no amount of noise limiter rids the noise on the Yaesu. My Courier 23 Plus radio hears the noise quite loud, but a reasonably strong signal does over-ride the noise. It does a better job vs the Yaesu ham transceiver. Now, the Knight KN-2565B somehow barely hears the noise and CB signals comes thru well. The Knight is not as sensitive as the stellar Courier, but hears about everything the Courier hears.
I have no idea why the Knight KN-2565B removes the noise and it does not have a noise limiter switch. If you have the same noise issue as myself, get a Knight KN-2565B. Welcome to the unfortunate reality of digital widget noise. It is the bane of radio operators, and unfortunately, it will only get worse as more and more of these devices are produced and more devices require internet access to operate. I had a curious issue similar to yours some years back. I had a digital noise issue (which turned out to be caused by my own ethernet router and cable modem), which was much worse on some radios and hardly noticeable on others. Best I can figure is that it depended on the IF frequency of the radio or the image frequency. Radios with 455 Khz IF's seemed more susceptible than radios with 7.8 Mhz or other higher frequency IF. Most of the digital interference is broad spectrum, but it also peaks at certain frequencies. The key is locating those peaks and trying to reduce them. I found that moving my internet stuff to a different room and placing clamp-on ferrites on the CAT 5 cables knocked a good deal of it down. Now though, I have new digital hash noise that plagues me. Fortunately, it's not TOO high that I can't hear anyone. But I usually get anywhere from S3 to S6 noise levels. I can't seem to isolate exactly where it's coming from. And in addition to that, I get an occasional pulsing noise that takes out at least a 2 Mhz wide swath of bandwidth. Yep, it's becoming a jungle of junk out there.....
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Sandbagger
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Post by Sandbagger on Jul 12, 2019 11:51:58 GMT -5
But if you a ham you can legally make them fix the problem. As a licensed operator you have legal right to clean and clear communication KD2RYS Well, yes and no. Devices that contain oscillators must pass FCC part 15 which has specifications for how much RF leakage is allowed. If the device violates the specs, then the FCC may get involved. But I have seen cases where devices emit enough RF to plague a sensitive radio receiver (I knew a weak signal VHF ham that was plagued by oscillator leakage from a cable TV box), yet are within part 15 specs. In that case there's nothing you can do. Ironically, it's become a case of the shoe being on the other foot and, as radio op's, we're starting to feel the way our neighbors felt when we would cause RFI to their TV's and radios and there was nothing they could do because our equipment was within spec.
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Sandbagger
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Post by Sandbagger on Jul 12, 2019 11:59:08 GMT -5
The noise is most likely those wifi repeaters to get the wifi signal through the ground wire of the AC outlet. Have seen it local. It can stop your cb hobby dead in its tracks. Those internet through house wiring devices are THE WORST. I had a pair of those, and when I plugged them in, I had an instant S7 hash noise level on all channels. Needless to say, those devices were trash bin candidates in short order. But if your neighbor has a set, there's not much you can do.....
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Post by tubefan on Jul 12, 2019 14:09:24 GMT -5
My neighbor has a set but that's a different story for a different forum.🤣
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Post by oldgeezer on Jul 12, 2019 15:22:36 GMT -5
BTW- I am almost 100% sure the Knight KN-2565B is same as the Cobra Cam 88 with the Panasonic chassis.
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Sandbagger
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Post by Sandbagger on Jul 12, 2019 16:00:55 GMT -5
BTW- I am almost 100% sure the Knight KN-2565B is same as the Cobra Cam 88 with the Panasonic chassis. I don't believe the Cobra CAM 88 was a Panasonic chassis. It is similar to them but the IF is different as well as the transmit section. But I agree that the Knight does closely resemble the CAM 88.
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Post by oldgeezer on Jul 12, 2019 20:25:20 GMT -5
Some stated a Panasonic chassis with differences. But......
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Post by 321 treeclimber on Jul 12, 2019 21:11:08 GMT -5
If the rf from one of those through house horror deals can effect a neighbors amateur radio or cb does the operators emission in turn effect the offending system ?
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Post by oldgeezer on Jul 13, 2019 10:43:15 GMT -5
Not likely. The offensive consumer electronics usually have a nasty & noisy switching power supply.
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Post by oldgeezer on Jul 13, 2019 10:46:56 GMT -5
BTW- if you buy a Knight KN-2565B or a Cobra Cam 88, RF power output suffers no matter how you tune the 6BQ5 plate & load capacitors unless you use a Hitachi 6BQ5 (EL84).
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Sandbagger
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Post by Sandbagger on Jul 13, 2019 14:46:42 GMT -5
If the rf from one of those through house horror deals can effect a neighbors amateur radio or cb does the operators emission in turn effect the offending system ? It depends on what is causing the noise. If the noise is being generated by the power supply or a harmonic of an oscillator, then chances are your signal ingress will not adversely affect the Digital Widget (DW). But if the noise is part of the data bandwidth, there could be some bit errors introduced as a result of your transmission. It may slow down the data a bit, but it likely won't be noticed all that much. Your signal is relatively narrow in bandwidth, while the data channel is fairly wide. It's like pissing in a river. You're not likely to affect it all that much.
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Post by 321 treeclimber on Jul 13, 2019 15:17:35 GMT -5
Im lookin up the law ! Cause that is not gonna happen. I dont care who says what, if something newly introduced to my neighborhood screws up my radio reception or transmission THAT THING DIES. I am responsible for making sure my equipment is within safe and unobtrusive working condition to emergency,aviation, maritime, law enforcement,military AND CIVILIAN COMMUNICATIONS, so it must work both ways! 321
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Post by oldgeezer on Jul 16, 2019 11:30:35 GMT -5
Looking at the Knight KN-2565B front-end, it appears the RF amplifier is tuned to the CB band only. Most tube and solid-state radios use a wideband RF amplifier that would work from 25 to 29mHz. That is why the Knight rejects trash from consumer devices.
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Post by 321 treeclimber on Jul 16, 2019 11:39:30 GMT -5
My comstat 25a and my robyn executive caribean flying yellow circus show with neon rainbow fiesta party lights is the same way and they are both Panasonic chassis.
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Post by 321 treeclimber on Jul 16, 2019 11:41:39 GMT -5
Very clear rec, doesnt pic up much trash. Kinda like my kids....321
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Sandbagger
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Post by Sandbagger on Jul 16, 2019 20:29:59 GMT -5
Looking at the Knight KN-2565B front-end, it appears the RF amplifier is tuned to the CB band only. Most tube and solid-state radios use a wideband RF amplifier that would work from 25 to 29mHz. That is why the Knight rejects trash from consumer devices. Most CB radios use a tuned circuit before the RF amp. That gives the front end some degree of selectivity. That barn door is not all that wide open.
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Post by oldgeezer on Jul 16, 2019 23:21:32 GMT -5
True, but some CB receivers are better at out of band interference reduction. My Courier 23 Plus does not cut it whereas I hear nothing with the Knight KN-2565B.
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Post by oldgeezer on Jul 16, 2019 23:33:38 GMT -5
BTW- if you buy a Knight KN-2565B or a Cobra Cam 88, RF power output suffers no matter how you tune the 6BQ5 plate & load capacitors unless you use a Hitachi 6BQ5 (EL84). UPDATE- I stand corrected on the statement above. The Cobra Cam 88 needs a Hitachi 6BQ5 for best power out. I assumed the Knight KN-2565B had same chassis. Differences must exist in the RF power tube circuit as the Hitachi does not work well in the Knight KN-2565B. RCA 6BQ5 makes full power out in the Knight.
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Post by 321 treeclimber on Jul 17, 2019 21:37:13 GMT -5
....cant stand the robyn 240d looks like mustard and Christmas lights. Its for sale. 321
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Post by oldgeezer on Jul 18, 2019 9:07:03 GMT -5
....cant stand the robyn 240d looks like mustard and Christmas lights. Its for sale. 321The Robyn sells for more than same chassis Colt, Gemtronics, Teaberry, Lafayette Constat 25. Robyn has receiver on par with Cobra Cam 88, Knight KN-2565B and not as good as the Courier 23 Plus. But, still receives well enough. The Robyn will not produce 20 watts peak transmit like the Cobra Cam 88, Courier 23 Plus and Knight KN-2565B for some reason.
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Post by 321 treeclimber on Jul 18, 2019 9:37:43 GMT -5
Most people see and love...i cant stand the sight of it and i dont like the "instant on" feature.would prefer a standby. But it walks and talks so i took it when handed to me. Had it recapped and cleaned it,paints in good shape. 4sale.
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Sandbagger
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Post by Sandbagger on Jul 19, 2019 13:01:49 GMT -5
Most people see and love...i cant stand the sight of it and i dont like the "instant on" feature.would prefer a standby. But it walks and talks so i took it when handed to me. Had it recapped and cleaned it,paints in good shape. 4sale. I was never a fan of the 40 channel "Yellow Bird" Robyn. I much preferred the 23 channel radio's green paint scheme.
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Post by oldgeezer on Jul 19, 2019 17:23:36 GMT -5
BTW- my new Yaesu Ham radio cannot receive AM CB very well due to the local interference. The Knight has no noise at all- incredible!
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Post by 321 treeclimber on Jul 19, 2019 19:54:25 GMT -5
10-4 on that seafoam green robyn sandy. I totally agree. As for old geezer and his new yeasu, i agree with that too. My icom7300 doesnt have great rec'v sound and lots of rf noise. But my comstat 25a is amazing! A pleasure to listen to. Hey geezer I'd love to see that courier...
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Post by oldgeezer on Jul 20, 2019 6:08:53 GMT -5
Picture Courier 23 Plus. Picture has white cat hair at volume knob, I removed. Attachments:
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Post by 321 treeclimber on Jul 20, 2019 7:32:31 GMT -5
This is the one for sale? Or you just bought this?
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Post by oldgeezer on Jul 20, 2019 12:59:15 GMT -5
SOLD....For sale- $115 with NOS 6BQ5s, power cord & mic jack. New power supply capacitors. Looks almost new....SOLD
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