- cnet 5614XE external fax modem need info - 1 Update
- Antennae Booster - 10 Updates
| Tom Kupp <tjkupp@gmail.com>: Sep 24 10:47AM -0400 > The internet is your friend. You might also try contacting CNet. > Peter Wieck > Melrose Park, PA Been there. Not the same model, and no DC voltage spec anyway. I have not found a way to contact CNET. All I get are recordings having to do with news; nothing about products. I think they left that business some time ago. |
| Stu jaxon <stankowalski02@gmail.com>: Sep 22 01:54PM -0700 Hi Group, can someone help please, I have an antenna booster that requires a power supply of 6v 100ma, can i use a variable power supply 6v 300ma??? Thanks, |
| dplatt@coop.radagast.org (Dave Platt): Sep 22 02:56PM -0700 >Hi Group, can someone help please, I have an antenna booster that requires a power supply of 6v 100ma, can i use a >variable power supply 6v 300ma??? Assuming that they're both DC supplies, and assuming that you get the polarity correct (positive-supply to positive-load, negative-supply to negative-load), and assuming that you're careful to not turn the variable power supply up to higher than 6 volts... yes, it should work. The 300 mA capacity of the variable supply is greater than the 100 mA which the booster will draw, and that's OK. However, turning up the supply to above 6 volts may damage the booster. I'd recommend checking the supply voltage with a voltmeter before you connect it to the booster. Do be aware that "antenna booster" amplifiers can cause more problems than they solve. In most cases you'll get better results by improving your antenna setup. |
| Stu jaxon <stankowalski02@gmail.com>: Sep 22 04:26PM -0700 On Tuesday, September 22, 2020 at 5:56:17 PM UTC-4, Dave Platt wrote: > Do be aware that "antenna booster" amplifiers can cause more problems > than they solve. In most cases you'll get better results by improving > your antenna setup. OK, very good. Thanks for that advice. |
| Phil Allison <pallison49@gmail.com>: Sep 22 06:57PM -0700 Dave Platt wrote: ----------------------- > Do be aware that "antenna booster" amplifiers can cause more problems > than they solve. In most cases you'll get better results by improving > your antenna setup. ** Unless you need to run multiple co-ax lines from your antenna, such boosters are a useless scam. I could only laugh at folk I saw buying them to *fix* the lousy pic that was coming from an indoor antenna in analogue days - and scowl at the ignorant pigs who supplied them for that purpose. This are not different now. ..... Phil |
| Ralph Mowery <rmowery28146@earthlink.net>: Sep 22 11:46PM -0400 In article <338b70aa-3da9-485f-a392-b1ab4aee6014o@googlegroups.com>, stankowalski02@gmail.com says... > Hi Group, can someone help please, I have an antenna booster that requires a power supply of 6v 100ma, can i use a variable power supply 6v 300ma??? I agree with Dave. It does not matter what the current rating of a supply ( as long as it is equal to or greater than what is needed by the device) is if it puts out the required voltage and not more. Some wall cubes will be listed at one voltage, but with a much lighter load will put out much more voltage. Just think of a voltage regulated supply like your house wiring. Many circuits are either 15 or 20 amps, but supply less than a tenth of an amp that many wall cubes and night lights use. Even the newer LED light bulbs only pull slightly more current than that. A device that is working properly will only draw the ammount of current needed. |
| Pimpom <nobody@nowhere.com>: Sep 23 01:02PM +0530 On 9/23/2020 3:26 AM, Dave Platt wrote: > Do be aware that "antenna booster" amplifiers can cause more problems > than they solve. In most cases you'll get better results by improving > your antenna setup. Agreed on all points except that, in certain situations, using an antenna booster is the only way to get an acceptable reception. TV came to this remote corner of India in 1980 when some army people discovered that it was possible to receive stations in neighbouring Bangladesh. Due to the very hilly terrain, reception varied from fair to unusable within tens of meters, all with outdoor yagi antennas. Antenna boosters were a must. The boosters were all alike, made up of 4 or 5 bjt amplifier stages. Power was fed to the booster via twin 300-ohm cable from an indoor 12V AC supply and gain was adjusted by means of a series potentiometer. I was the local "expert" and I experimented with different antenna types, including yagi arrays and helical antennas with a 6-foot plane reflector. Some people claimed that reception was noticeably improved by hanging aluminium pans on their yagis. |
| Pimpom <nobody@nowhere.com>: Sep 23 03:36PM +0530 On 9/23/2020 1:02 PM, Pimpom wrote: > antenna types, including yagi arrays and helical antennas with a > 6-foot plane reflector. Some people claimed that reception was > noticeably improved by hanging aluminium pans on their yagis. Once I even rigged up a passive re-radiator with a back-to-back pair of yagis on a hilltop for a client who had no reception at all in his house which was located on the blind side of the hill. It worked somewhat but was not really satisfactory. What I couldn't really explain was that reception slowly but steadily degraded in the decade from 1980 to 1990 (when cable TV arrived). In 1980, I could often get excellent reception in my house with literally an aluminium coat hanger plugged into the antenna socket. By contrast, I could watch the 1990 FIFA World Cup only with an array of four yagis *and* an antenna booster. |
| Phil Allison <pallison49@gmail.com>: Sep 23 04:32AM -0700 Pimpom wrote: -------------- > stages. Power was fed to the booster via twin 300-ohm cable from > an indoor 12V AC supply and gain was adjusted by means of a > series potentiometer. ** You are describing a dedicated "mast head amplifier" which do work well with weak signals. "Antenna boosters" are not the same thing, only meant for indoor use. .... Phil |
| Pimpom <nobody@nowhere.com>: Sep 23 05:56PM +0530 On 9/23/2020 5:02 PM, Phil Allison wrote: >> series potentiometer. > ** You are describing a dedicated "mast head amplifier" which do work well with weak signals. > "Antenna boosters" are not the same thing, only meant for indoor use. I'm familiar with the term 'masthead amplifier' but they're all called 'antenna boosters' over here - in popular usage, on the package and sometimes on the unit itself. I didn't know that the latter term is reserved for indoor units elsewhere. |
| Phil Allison <pallison49@gmail.com>: Sep 23 05:31AM -0700 Stu jaxon wrote: ---------------------- > Hi Group, can someone help please, ** Did I hear someone say "antennae booster" ?? https://allyouneedisbiology.wordpress.com/2018/06/10/insects-antennae/ .... Phil |
| You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com. |
No Response to "Digest for sci.electronics.repair@googlegroups.com - 11 updates in 2 topics"
Post a Comment