| samsung cordless phone has anyone used the samsung cordless telephone
»www.goodbyelongdistance.com/sams···ess.html
please i need your comments |
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dgc3154
join:2003-09-25
Port Carling, ON | Haven't used one yet but I ordered a set today after much investigation. I'll let you know how it works out. |
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azz777
join:2003-02-05
New York, NY | is it legal in the State? FCC...? thx |
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| reply to yaman
I can find no link to this phone on the Samsung web site. Does it really exist, or is it a scam for the gullible? |
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 PCInTechkeeping art alive since 1953Premium
join:2004-06-07
Massena, NY
kudos:9
 ·VoicePulse
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A quick search took me to adpost.com, where there are a few of these selling for $170. to $280. Is this even possible? I find it hard to believe they can deliver the promised range, or that a transmitter of that capability would even be allowed by law. If anyone does get a hold of one, please keep us posted as to the actual performance. I may be a skeptic, but for the moment, I'll put this in the "If it seems too good to be true, It probably is." category.  |
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dgc3154
join:2003-09-25
Port Carling, ON | reply to yaman
It appears as though this particular phone operates in the approximate range of the GMRS band allotment, around 430 to 450 MHz, as such the transmitter wattage may operate in the 5 watt range. This info according to the FCC website. To be legal GMRS must be licensed and the annual License fee looks to be around $80. If this is the case I have no doubt that more than several miles would be achievable under reasonable conditions particularly in light of the fact that an external antenna is suppled with the base unit. I had a long chat with the rep for this product and he assured me that users were experiencing 10 to 20 miles mobile to base and up to 200 miles base to base over water. Anyway, we shall see what happens as my units are on their way via DHL. I'm also assured by the same rep that a 30 day money back guarantee will be honored if I am not satisfied with the phone. Believe me I'll be putting it through its paces. |
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 BLL9
join:2004-07-12
Encino, CA | said by dgc3154:It appears as though this particular phone operates in the approximate range of the GMRS band allotment, around 430 to 450 MHz, as such the transmitter wattage may operate in the 5 watt range. I would want to know the exact frequencies of operation and all licensing, equipment type-certification and other legalities before using such a system on U.S. soil. The frequency range you mention is shared by a number of licensed services, including amateur radio, and wind shear detection systems near airports. It would be a shame to have men in dark suits knocking on your door with complaints of interference to aviation safety.
I believe the UHF GMRS channel allocations are between 462 and 468 MHz. Unlicensed below .5 watts, licensed between .5 and 5 watts. (But don't rely on me, research it yourself.) |
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 vonsenJust BecausePremium
join:2005-01-06
3 edits | reply to yaman
"samsung" |
Having said all that, I did the 30 second search thing and yes, there are a handful of mainland china companies now manufacturing these radios. Typically, they are operating in the 268.00-269.98 /398.00-399.98mhz range, with a claimed 6W base and 1.5W handheld power and are not meant for use in n. america. A few fall into the unlicensed 900mhz band. On a lark, I called them in china to find out what the wholesale pricing was like and they did indicate a willingness to tweak the mixers and output to move it into the GMRS band, which is probably the case here. That means you will need an $80 license to use this. I don't see that tidbit mentioned anywhere on their webpage. And you really do want the license. With a potential fine of $5K per day for unlicensed use, getting caught without one could be painful.
So in theory you could approach a 30 mile range, but at a guess, I'd say real life might approach 20 miles in rural Iowa under ideal conditions and you'd be lucky to get a tenth of that if you are in a building downtown. Perhaps dgc3154 will keep us up to date on how it actually works, since he has ordered one. Please understand that I am in no way vouching for the online retailer. Only that the equipment does exist. It sure ain't made by samsung though, despite the samsung sgh-n105 phone pictured on the webpage. I couldn't get a clear answer as to whether it is a knockoff or whether they are modifying samsung gsm cells.
Okay, so here's the math. If you are really math phobic, you should stop reading here. I mean it.. last warning, simple, useful, scary math about to pop onto the page...
Signal loss in air can be approximated by..
path loss = 20log(4*π*(r/λ))dB
where our wavelength = 3x10*8/4.62x10*8 = 0.649m
which solves to a loss of -119.4dB for 30 miles.
So our link budget then is
-119.4dB path loss
-0.3dB absorption
-6dB fresnel loss
-10dB for some inevitable minor obstruction
-10dB fade margin
-145.7dB signal loss for 30 mi.
the return link will be the weaker one by far. I have a hard time believing the 1.5W output but I'll use it anyway and we'll be very generous and assume no antenna loss, so
31.8dBm ERP handheld
6dB receiving antenna gain
-2dB cable loss
35.8db link
Leaving us with -145.7dB link - 35.8dB link = -109.9dB NLOS
The base receiver needs a tuner sensitivity of 109.9dB to pick up the signal under these conditions, which is a hot receiver. I'd say that the receiver is really closer to 100dB. But you get the point. Improbable, but not impossible assuming that the specs are what they say they are.
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Helllllllllllllllllllllllllllllp, I think that the broccoli is after me |
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 oroperPatriots Rule
join:2004-06-01
Beverly, MA | said by vonsen: If you are really math phobic, you should stop reading here. I mean it.. last warning, simple, useful, scary math about to pop onto the page... Interesting post. I didn't listen to you and got lost in the math |
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tj008
join:2004-06-24
Cincinnati, OH | reply to vonsen
Does it say anywhere that these phones are using Digital Spread Spectrum or are they open frequency? I would hate to get a set of these and use them on the GMRS frequencies where everyone can listen to my conversation with the proctologist.  :D
I used to use a nice set of GMRS radios in Cincinnati on a kind person's repeater. Those radios (handheld) had a nice range. and yes, a license is $80 and lasts for five years, and can be used by ones immediate family. Of course, it's been a while since Ive read through the FCC docs.
From the website, it looks as if you need to build yourself a radio station to get the range they say. If you go that far, build yourself a GMRS repeater station for the city in which you live. Then you can offer those interested a nice service. Or get an amateur radio license and use a phone patch. Especially if the samsung phones are not DSS capable.
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vonsenJust BecausePremium
join:2005-01-06 | said by tj008:Does it say anywhere that these phones are using Digital Spread Spectrum or are they open frequency? There isn't any details on that or anything else on the cited webpage. The Chinese models that I found are analog full duplex, not DSS. Ten or 100 frequencies seem to be the norm. So the scanner enthuiasts could listen in. You do realize though that DSS may hide your call from Grandma with a radio shack scanner, but it doesn't stop any decent ham from multiplexing your DSS call and listening in to those too.
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Helllllllllllllllllllllllp, I think that the broccoli is after me |
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tj008
join:2004-06-24
Cincinnati, OH | Thats kind of what I thought too - analog full duplex. Guess I'll dust off that ol' scanner. There are some new cordless phones to listen to now. 
DSS is nice tho - better than talking without it.
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 usa2kBlessedPremium,MVM
join:2003-01-26
Canton, MI
kudos:3 | reply to yaman
Re: samsung cordless phone. Notice on a Whois they have a California address with a bogus 2135551212 phone number listed. Otherwise the concept is cool! |
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vonsenJust BecausePremium
join:2005-01-06 | reply to yaman
Re: samsung cordless phone This is tempting. I'd like to try contructing a wireless corridor between home and work (12km), using two of these. Goodbye cellphone. Or at least the cell would move to a very low usage plan. I don't suppose that dcg3154 or anyone else has gotten one yet..
There are also some very good wholesale prices to be had from other vendors, although it is not clear yet if it is possible to get them on either GMRS or amateur frequencies with wholesale pricing. Their primary markets are on other continents and in bands that would not be legal in n. america.
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Hellllllllllllllllllllllllp, I think that the broccoli is after me |
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| This is an interesting concept..I look forward to hearing more about how these phones work out for you.
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»www.talkaboutvoip.com |
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 voiploverPremium
join:2004-05-28
Portsmouth, NH | Don't you need to get the license for the frequency first?
I think that you can use them in N America, just not across any land mass. We have marine radios here that have about the same transmitting radius. You can get a marine radio license but you are no longer required to. Just don't get caught using it on land (people will hear you chatting on their TV sets).
On another point. That radio looks fairly small. If it is indeed cranking out 5 watts, it's going to get a little on the hot side if you talk long.  |
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dgc3154
join:2003-09-25
Port Carling, ON | reply to vonsen
Just checked the tracking number on mine. They should be here tomorrow or Tues. I'll update |
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tj008
join:2004-06-24
Cincinnati, OH | reply to voiplover
said by voiplover:Don't you need to get the license for the frequency first? If they are GMRS, he can get the license online at the FCC website. There is no test outside ones credit card passing. :D
I would probably do some testing on the frequencies being used first before paying for a license. A local radio shop or ham operator could help in this area.
Cant wait to find out the results.
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vonsenJust BecausePremium
join:2005-01-06 | reply to dgc3154
said by dgc3154:They should be here tomorrow or Tues. I'll update Thanks, we'd appreciate some first hand comments about how well this works for you. In addition to anything you'd like to pass on about range and voice quality.. can you confirm that the handset is full-duplex (that is works like a phone, not just like a push to talk walkie talkie)?
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dgc3154
join:2003-09-25
Port Carling, ON | Well here's a very preliminary update. I received the equipment in good order and in record time by International Express from the Philipines no less. Here is what was included in the package. The "Samsung" (tongue firmly planted in cheek) SG-368D long range cordless telephone system....I say "tongue in cheek" as having worked for Samsung Telecommunications for almost 4 years it is clear to me that this is an OEM'd product which I'm quite sure Samsung had no intention of marketing in North America. Anyway......included in the package are two "electric blue" flip phone handsets which resemble a standard cell phone except for the approx 16" telescopic antenna reminiscent of the old CB walkie talkie days. They fit the palm quite nicely and come complete with leather carrying cases, car lighter chargers, ear buds, and standard in house chargers. Also included is the base station with LED display and function buttons and an external, what appears to be, modified dipole antenna equipped with 50' of RG58 coax terminated to an M type ? connector which screws into the base unit. Now here's the kicker....everything included that is designed to function on house current requires 220V i.e: no dual voltage settings available on this baby. So off I went to the local electronics store to purchase a 110V to 220V converter. Long story short I set up the antenna, plugged the base into 220 fired up the handsets and in no time my modified dipole was glowing with 5 watts of questionably legitimate long range talk power and all tied into my in house PBX system. I got dialtone, dialed a number and voila was connected. Sound quality is surprisingly clear i.e: no background noise or digitized sound....to my relatively untrained ear I would say transmission is via FM mode and is full duplex when unit is functioning in telephone mode as opposed to intercom mode at which time the handsets function in half duplex by using a push to talk button on the side of the handset. As far as range is concerned I haven't really put the equipment through the test as yet. I want to investigate the technical side of things a bit more before doing so i.e: verifying the operating frequencies etc. Two things I am fairly sure of this equipment operates outside of the GMRS band and there is definitely no UL certification on the equipment. I would say that you would most likely be importing and using this equipment at your own risk in the US. My intention is to use this equipment outside of the country and I'll comment more on that later with an update on range etc. Hope this whets some curiosity so far....Cheers |
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