Need some questions answered

[guest5255 0]

Hi!

I hope my questions are not too begginer ones, spend lots time searching for info and would appreciate some answers.

1. I use USB modem(2.4hz, with 7 dBi antenna works nicely, but I want more range. I bought 10 m cable for 12 bucks and it just didnt work. I connected the antenna with my modem. I dont know was the cable such low quality or what that the losses were so big? It was the same as there were no antenna. If I use antenna direct on the usb modem it works like a charm.

2. Can I use large old tv antennas for wifi with no modifications?

3. Can using non 2.4 gHz tv antenna or home made one fry my Usb modem?

4. I bought 3m long coaxial cable and tried to wire 1 diy, 1 old antenna with no sucess. Are cable losses really so big or I dont do the wiring appropriately. Does a tiny mistake when installing connectors manually messes up everything?

5. I bought 21 dBi square flat antenna. If I put usb modem without any cable using adapter on the antenna, do I need some sort of shielding to protect the modem?

 

Thank you!

 

 

 

Edited March 2, 2022 by guest5255

[swarg_eu 43]

1. it depends on the cable, for example, the cable has a loss of 0,5 dB/m multiplied with the 10m gives 5dB of signal loss the 7dBi antenna acts now as a 2dBi antenna

2. no TV and WIFI are at different frequencies and a TV antenna is not optimized for 2,4 GHz

3. no it can't, the power of the USB dongle is not high enough to cause any damage due to a mismatch

4. depends on the cable (check the cable specification, the type is usually written on the cable or post a picture of the cable). 2,4 GHz is not that sensitive to small mistakes, make sure that you don't have a short circuit 

5. no you don't need a shielding on the USB modem, 21 dBi make sure that the antenna is for 2,4 GHz