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STOP BUYING EXPORT CB TYPE SSB TRANSCEIVERS
- Thread starter Sonar
- Start date
Purist? AHHAHA damn right I aint. You made laugh,.
Figured I'd get a chuckle out of ya, mate.
Honestly, I've no idea why. Doesn't make sense to me.
~Cheers~
That's what I meant by bad experiences. That guy may have ran across a ham with a bad attitude at some point so he hates them all. He thought you were one of them and shouted at you....who knows for sure.
Probably figured my accent from the deep south of England required a bit of his attention. when they fling me abuse, I smile. thats all i can do.
Robb,
The spur I'm referring to is a small spur that shows up in the 10M band when the radio is put on a spectrum analyzer. It's caused by a poorly designed mixing scheme.
Here's a video on this issue.
I checked this for validity, and he's right on the button with it. I show a small spur on the 10M voice band. The radios I used were a Galaxy 99 and a Galaxy 95T.
Hope this helps.
(Edit) The Superstar 360FM is the same basic board as the Galaxy 77/88/99. No bueno.
~Cheers~
I watched the video. Interesting. So; does a CB not have a harmonic 50db down as well? Did you check for that? Or is it because of the design of the board? If not; how is it filtered out of a CB chassis?
Thanks!
A CB doesn't have this problem from what I've seen, due to the band pass filtering system that's in place after the final. It's designed not to pass RF very easily at 10M (There's also a tuning slug in most older radios that helps control emissions at 54mhz).
Also the mixing scheme on most older CB's are different than the newer ones. A lot of the older radios use the 7.8mhz IF while the newer export radios use the 10.695mhz setup as described in the video.
The combination of the 10.695mhz mixing scheme plus the band pass filtering being setup from factory to pass full emissions @10m is what can cause this 10M spur to show up.
I have checked CB's for this and I haven't had a CB exhibit this issue.
~Cheers~
Also the mixing scheme on most older CB's are different than the newer ones. A lot of the older radios use the 7.8mhz IF while the newer export radios use the 10.695mhz setup as described in the video.
The combination of the 10.695mhz mixing scheme plus the band pass filtering being setup from factory to pass full emissions @10m is what can cause this 10M spur to show up.
I have checked CB's for this and I haven't had a CB exhibit this issue.
~Cheers~
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I totally forget that both my rigs are exports. They were both purchased at CB Stop on 84st and 16ave BK NY (Millie.)
Then exported to NJ.
My bad. I do like exports!
Then exported to NJ.
My bad. I do like exports!
Robb,
The spur I'm referring to is a small spur that shows up in the 10M band when the radio is put on a spectrum analyzer. It's caused by a poorly designed mixing scheme.
Here's a video on this issue.
I checked this for validity, and he's right on the button with it. I show a small spur on the 10M voice band. The radios I used were a Galaxy 99 and a Galaxy 95T.
Hope this helps.
(Edit) The Superstar 360FM is the same basic board as the Galaxy 77/88/99. No bueno.
~Cheers~
Thanks for sharing this clip Robb.
Even with my lack of knowledge and understanding of the items that make our hobby possible, I totally understood the clip and what the gentleman who made it was out to prove.
The clip is educational on three levels. 1. He does the math. 2. Shows it happening on an analyzer. 3. We get to see it and hear it on his transceiver.
I'm sure there will be somebody who will find a reason to argue that the test was invalid for one reason or another. Either way it was very convincing. It kind of made a case for a mars modified HF over a 10 meter black box (modified) transceiver. What the hell, either choice is breaking the law why not keep it clean while doing so. Going with the choice that's not going to bother a 10 meter operator is a good idea. Thanks again. 73 PS. I'm not a ham but definitely understand why someone who's taken the time to earn the right to operate on those affected frequencies might be upset.
HUH? There are now 5 FTDX 1200's there, All of them are used and all of them are in the continental 48.
BTW...............All Yaesus do come from "overseas", including the new ones @ HRO.
I purchased a Kenwood 440 for $200 in full working condition. Bought off of craigslist and requested the operator test it. Verified power output am, FM, SSB, CW, and FSK. I took along a Frequency Counter and checked if it was on frequency. All good.
All of that for less than the cost of an export CB. Does the Kenwood do CB band? I don't know and don't care if it doesn't. I run my Yaesu ft-857 and a cobra 19 when going on a trip. I learned to keep my microphones separated and to look at them before transmitting.
All of that for less than the cost of an export CB. Does the Kenwood do CB band? I don't know and don't care if it doesn't. I run my Yaesu ft-857 and a cobra 19 when going on a trip. I learned to keep my microphones separated and to look at them before transmitting.
I have a nearby business using CB CH19 M -F 7AM _ 5PM, they cause interference on 28.080, a freq that I use quite a lot.
After politely informing them about the problem they were causing and getting a FU type answer, I sent them a registered mail letter and stated the problems again.
there was no cessation of the interference.
A copy of the letter and proof of delivery from the post office was sent to Laura Smith and 3 weeks later, they "got a visit". the illegal interference stopped.
They are still on CH 19, but, it seems that they are now using different radios that do not TX in the Amateur bands. for some reason, their signals are not as strong either.
The ones who would try to discredit a study like this probably do not understand the new radio designs.
I'll wager that they were running a Linear on the base station.