[Merged] Radio talk

[boybi]

san kaya niya nabili yun FRS external antenna? sana wag na yun bubutasan yun tsikot kahit slightly opened na lang yun window for the cable

don't worry, clip on lang naman sa mga edges ng car ang mga external antennas.

[boybi]

try ko nga mag-monitor sa frequency na yan. baka naman puro russian ang mapakinggan ko

[afrasay]

Maliit lang ang antenna ng UHF FRS band mga isang dangkal ko lang. Yun VHF 2 meter ang full wave kaya mga 2 meter band ang tawag dun. So you can just imagine ang full wave ng CB 27mhz, 22 meters (correct me if I'm wrong) and more so HF and LF band na parang kulahan ng damit. Radios using disk (as in microwave disk)are usually in the GHz freq range. And some, namely satelite communications doesn't even use coaxial cables just waveguide as in parang aluminum sqaure tubing as transmission media.

[StraightSix]

... ang full wave ng CB 27mhz, 22 meters (correct me if I'm wrong) and more so HF and LF band na parang kulahan ng damit.

27 MHz CB band is 11 meters.

And some, namely satelite communications doesn't even use coaxial cables just waveguide as in parang aluminum sqaure tubing as transmission media.

Waveguides are used on microwave frequencies because other transmission lines, like cables, have very high losses per length (attenuation) on higher frequencies. But that doesn't mean that all satellite communications are on microwave.

An example satellite is the RS-10/11 which had uplinks on 15m and downlinks on 10m ... both of these bands are on HF. And yes, coaxial cables were used for those because waveguides would be impractically huge at those frequencies.

[oldblue]

* afrasay, what would you recommend na gawin ko para ma-extend sa tsikot yun antenna para sa fixed antenna unit ko?

[lm723]

Guys, may bayad ba ung license?

[lm723]

Found this wiki about FRS and SRRS.
http://en.wikipedia.org/wiki/Family_Radio_Service

Philippines

The Philippines has a radio service for use of families and small businesses. This service is called SRRS or Short Range Radio Service. Units are limited to simplex operations and have a power limitation of 2.5 watts. [6]

This service has been allocated 40 channels in 325 MHZ spectrum:

Channel Frequency Channel Frequency Channel Frequency Channel Frequency
1 325.0000 11 325.1250 21 325.2500 31 325.3750
2 325.0125 12 325.1375 22 325.2625 32 325.3875
3 325.0250 13 325.1500 23 325.2750 33 325.4000
4 325.0375 14 325.1625 24 325.2875 34 325.4125
5 325.0500 15 325.1750 25 325.3000 35 325.4250
6 325.0625 16 325.1875 26 325.3125 36 325.4375
7 325.0750 17 325.2000 27 325.3250 37 325.4500
8 325.0875 18 325.2125 28 325.3375 38 325.4625
9 325.1000 19 325.2250 29 325.3500 39 325.4750
10 325.1125 20 325.2375 30 325.3625 40 325.4875

[CVT]

AFAIK, FRS tranceivers need to be certified by the NTC to make sure that they're within the frequencies allocated by them for free service. These are listed above. The trouble is, there is no international standard, so some FRS tranceivers bought outside the country may be in violation of the frequency assignment here in the Philippines. Take note also of the maximum power spec.....

DU1-IJA....

9404:vader:

[StraightSix]

Ayos ah ... 2.5 watts maximum sa Pilipinas? In most countries it's a lot less. From its name I'm assuming SRRS isn't limited to handheld radios, but still limited to direct contacts.

* CVT - Ngayon ko lang napansin yang call mo. Have you been in the hobby for some time? What band/s do work?