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Country Discussion Topics
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Question #1
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~Lenore    Posted 10-11-2004 at 08:06:18       [Reply]  [No Email]
I have a question about cordless phones.
I had a cordless GE 900MHz,
I could take it to my neighbor lady's house and it worked fine.
I just bought a replacement, a GE 2.4GHz.
It does not work over at her house at all.
What is the difference between MHz and GHz?
Would 5.4 GHz be the equivalent of my old 900MHz ?

That is Question 1. thanks for any helpful information.

Question 2 may or may not follow. LOL

Mike    Posted 10-11-2004 at 19:34:09       [Reply]  [Send Email]
Many of the GHz phones have different 'channels' that can be selected. When I first got mine, the default channel it was set to wouldn't go 50 feet. After trying different channels I found one that went out much further. The furthurest I've used it so far is 100 yds.

toolman    Posted 10-11-2004 at 11:51:48       [Reply]  [No Email]
answer: frequency, oh and one thing on the 900mhz alot of scanners can pick up your conversation within range, just some usless info ,thought you might like to know though.

Judy in NC    Posted 10-11-2004 at 10:24:22       [Reply]  [Send Email]
Thanks for the question Lenore.

I, too, recently purchased a new portable phone with the same experience as yours - I'm very disappointed. In my ignorance, I had thought when I purchased it that the higher hertz number would mean greater distance transmission. My new one won't even transmit just out into my yard very well.

Judy in NC

big fred    Posted 10-11-2004 at 09:18:19       [Reply]  [No Email]
As tacon1 pointed out, all else being equal, the lower frequency 900MHz will have a longer range. All is not equal, however, as there are several other things in the 2.4 GHz band, including microwave ovens, wireless computer networks, etc, so 2.4 GHz is worth avoiding due to interference. Another reason to avoid 2.4 GHz is thats there is a good reason that microwave ovens are at 2.4 GHz, it's the best frequency for cooking stuff. You sure you want that little transmitter right next to your head?

tacon1    Posted 10-11-2004 at 09:13:36       [Reply]  [No Email]
I also agree with Bob, certain things like microwave ovens do interfer with the 2.4GHz.

tacon1    Posted 10-11-2004 at 09:08:14       [Reply]  [No Email]
Also consider this:

These two equations can be used to compare the maximum range of the 9XStream and 24XStream modules.

1. Consider the range of the 9XStream module:

= 0.33 meters (for f=900 MHz)

(Eq. 1) Path Loss = 113 dB = 20 * log(4*p*r/?)
(Eq. 2) Path Loss = 21dBm + 2dB + 2dB - (-110dBm) - 22dBm= 113 dB

By setting these equal to each other, a little computation reveals that r=11848 meters, or a little over 7 miles.
2. Now consider the 24XStream module:

= 0.125 meters (for f=2.4 GHz)

(Eq. 1) Path Loss = 105 dB = 20 * log(4*p*r/?)
(Eq. 2) Link Budget = 18dBm + 2dB + 2dB - (-105dBm) - 22dBm = 105 dB

Once again, setting these equations equal leads to r=1768 meters, or just over 1 mile.

From this example, it is shown that operating at 900 MHz exhibits a significantly longer range than is possible at 2.4 GHz.

Coloken    Posted 10-11-2004 at 08:43:58       [Reply]  [Send Email]
2.4GHz is 2400MHz. I am supprised the 2.4 did not work. My experience is the 2.4 s work better at greater distance.
A MHz is one million cycles per second.
A GHz is one thousand million cycles per second.
The called cycles/sec "hertz" in honor of a guy named (guess) Hertz.

Bob    Posted 10-11-2004 at 08:37:14       [Reply]  [No Email]
1 GHZ = 1000 MHZ, so new phone is MUCH higher up in the radio spectrum. Certain things, including microwave ovens interfere with the 2.4 GHZ phones.

Clod    Posted 10-11-2004 at 10:40:41       [Reply]  [No Email]
There could be a diffrence along these lines. The higher the frequency,the more directional the signal is. You can be blocked by materials more. Somewhat like a flashlight beam will not penetrate wood.

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