- Oreck XL Air Purifier Repair - 2 Updates
- Small transmitter antenna - 14 Updates
- Playing a flashdrive thorugh a car radio. - 1 Update
| FreeMan <freeMan@SpamFree.com>: Feb 21 06:59AM -0800 Only generates Ozone when you hear a snap. There is an ozone filter in it they say. So is there any take it apart videos out there ? I have been looking. Model AIRPSXXA051003 |
| Terry Schwartz <tschw10117@aol.com>: Feb 22 07:58AM -0800 On Wednesday, February 21, 2018 at 8:59:13 AM UTC-6, FreeMan wrote: > So is there any take it apart videos out there ? > I have been looking. > Model AIRPSXXA051003 It almost does not matter. Most of the models, including the SP models show the fan motor as no longer available. I'd say it's time to retire the units. You've gotten 10 years service out of them. That's good by today's standards, especially for a product that uses high voltage. |
| "Gareth Magennis" <soundserviceleeds@outlook.com>: Feb 21 06:37PM OK, so I have one of these to repair, which is missing the "tail" antenna on the transmitter. http://www.samsontech.com/samson/products/wireless-systems/airline/airline-ag1/ Now I know very little about RF, antennae etc. I can't get a replacement antenna for this, so how feasible would it be to make one? I assume this will be a fine coil of wire covered in rubber, e.g. a tiny rubber ducky? Or could you just attach a long wire and roll/pack it up and attach the blob to the guitar/guitarist? Cheers, Gareth. |
| Pat <pat@nospam.us>: Feb 21 02:08PM -0500 On Wed, 21 Feb 2018 18:37:08 -0000, "Gareth Magennis" >Cheers, >Gareth. Rather than the "fine coil of wire" you mentioned, it is likely just a piece of wire. The length should be the about the same as the original. The length would be similar to the length of the antennas on the base unit. |
| Ralph Mowery <rmowery28146@earthlink.net>: Feb 21 02:10PM -0500 In article <p%ijC.119756$3X6.90914@fx22.am4>, soundserviceleeds@outlook.com says... > rubber ducky? > Or could you just attach a long wire and roll/pack it up and attach the blob > to the guitar/guitarist? It would help to know the frequency range this operates on. Looks to be about 6 inches of wire. If it is operating close to 450 MHz, then about 6 inches of wire is all that is needed. Measure the antenna on the receiver and use a piece of wire that long. |
| "Gareth Magennis" <soundserviceleeds@outlook.com>: Feb 21 07:20PM "Ralph Mowery" wrote in message news:MPG.34f78e223f99e335989723@news.east.earthlink.net... In article <p%ijC.119756$3X6.90914@fx22.am4>, soundserviceleeds@outlook.com says... > Or could you just attach a long wire and roll/pack it up and attach the > blob > to the guitar/guitarist? It would help to know the frequency range this operates on. Looks to be about 6 inches of wire. If it is operating close to 450 MHz, then about 6 inches of wire is all that is needed. Measure the antenna on the receiver and use a piece of wire that long. ************************************* From the manual: It operates in the uncrowded 801 – 805, 863 – 865 MHz UHF frequency range Gareth. |
| Ralph Mowery <rmowery28146@earthlink.net>: Feb 21 02:49PM -0500 In article <lEjjC.376107$Nt6.128804@fx43.am4>, soundserviceleeds@outlook.com says... > It operates in the uncrowded 801 ? 805, 863 ? 865 MHz UHF frequency range In that case the antenna should be about 3 1/4 to 3 1/2 inches long. If you are using wire that is insulated, just make it 3 1/4 inches. That is probably close to the origional length. That makes it a 1/4 of an electrical wavelength long. For a low power short range piece of equipment, I doubt it makes much difference on how long it is, from 3 inchs to a foot long. |
| "Gareth Magennis" <soundserviceleeds@outlook.com>: Feb 21 08:16PM "Ralph Mowery" wrote in message news:MPG.34f7974b46a65bc0989724@news.east.earthlink.net... In article <lEjjC.376107$Nt6.128804@fx43.am4>, soundserviceleeds@outlook.com says... > It operates in the uncrowded 801 ? 805, 863 ? 865 MHz UHF frequency range In that case the antenna should be about 3 1/4 to 3 1/2 inches long. If you are using wire that is insulated, just make it 3 1/4 inches. That is probably close to the origional length. That makes it a 1/4 of an electrical wavelength long. For a low power short range piece of equipment, I doubt it makes much difference on how long it is, from 3 inchs to a foot long. ****************************************** OK, so the "antenna" is just a piece of wire then. Blimey. Gareth. |
| "Gareth Magennis" <soundserviceleeds@outlook.com>: Feb 21 08:19PM "Ralph Mowery" wrote in message news:MPG.34f7974b46a65bc0989724@news.east.earthlink.net... In article <lEjjC.376107$Nt6.128804@fx43.am4>, soundserviceleeds@outlook.com says... > It operates in the uncrowded 801 ? 805, 863 ? 865 MHz UHF frequency range In that case the antenna should be about 3 1/4 to 3 1/2 inches long. If you are using wire that is insulated, just make it 3 1/4 inches. That is probably close to the origional length. That makes it a 1/4 of an electrical wavelength long. For a low power short range piece of equipment, I doubt it makes much difference on how long it is, from 3 inchs to a foot long. ********************************** Thanks, Ralph, you have made my day. I thought it was much more complicated than a piece of wire. Gareth. |
| Terry Schwartz <tschw10117@aol.com>: Feb 21 12:38PM -0800 It can be, this is a topic that of late is near and dear to my career. Antennas are a science to themselves. Any piece of wire can be an antenna, but if you want efficiency and range, things get a *lot* more complicated quickly. It's far too broad a topic to cover here, and there is plenty written about it on the web (not all of which is correct). It's safe to say that for your application, a hunk of wire is sufficient. Terry |
| Tim R <timothy42b@aol.com>: Feb 21 12:57PM -0800 But a yagi would be fun. |
| Mike Coon <gravity@mjcoon.plus.com>: Feb 21 09:11PM In article <62ca1da1-31f4-472f-aea6-cb046149a661@googlegroups.com>, timothy42b@aol.com says... > But a yagi would be fun. Good exercise, you could say... Mike. |
| Ralph Mowery <rmowery28146@earthlink.net>: Feb 21 10:04PM -0500 In article <FvkjC.177164$t77.70928@fx29.am4>, soundserviceleeds@outlook.com says... > Thanks, Ralph, you have made my day. > I thought it was much more complicated than a piece of wire. Simple antennas are not that complicated. Juat a piece of wire 1/4 of a wavelength long should work fine for that application. When you get much below 450 MHz and want an antenna shorter than around 6 inches is when it will get somewhat complicated . Then they look like a spring under the insulation. There is a number around 234 that if you devide it by the frequency in MHz you will get the length of a simple 1/4 wave antenna. |
| Phil Allison <pallison49@gmail.com>: Feb 21 07:43PM -0800 Gareth Magennis wrote: ---------------------- > make one? > I assume this will be a fine coil of wire covered in rubber, e.g. a tiny > rubber ducky? ** While possible, it is just as likely to be a simple 1/4 wave whip. > Or could you just attach a long wire and roll/pack it up and attach the blob > to the guitar/guitarist? ** Err- no. .... Phil |
| Phil Allison <pallison49@gmail.com>: Feb 21 08:17PM -0800 Gareth Magennis wrote: ---------------------- > From the manual: > It operates in the uncrowded 801 – 805, 863 – 865 MHz UHF frequency range ** Normally a straight, 1/4 wave length whip antenna does the job well. Helically wound antennas (rubber duckies) are not better, only shorter and less efficient. I note the owners manual says the antennas are 1/4 wave. RF travels at 300,000 km/S so 830 MHz has a wavelength of 360mm, 25% of which gives you 90mm from the attachment point inside the Tx. A 5% "end correction" can be applied so make it 85mm. Use wire that has a stiff cover like Teflon, to hold it out straight. ... Phil |
| gregz <zekor@comcast.net>: Feb 22 09:18AM > That makes it a 1/4 of an electrical wavelength long. > For a low power short range piece of equipment, I doubt it makes much > difference on how long it is, from 3 inchs to a foot long. It could be a coaxial type full wave. Greg |
| oldschool@tubes.com: Feb 20 05:17PM -0600 >When TV was analog, you used to be able to hear the sound carrier of Ch 6 >at the bottom of the FM radio band. >mark I used to listen to the Channel 6 TV news in my car, to get the weather report, when I lived near a city that had a Ch6. That was analog TV. I was wondering what a digital signal did now, or if tv still used that low FM band anymore. I no longer live where there is a CH6 tv signal. |
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