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How to select the battery for your HF tranceiver

Many hams like to make QSO outdoor, so the battery is very important to them. Do you know what are the common amateur radio portable batteries?  ...

Read more  Amateur Radio,  Battery

What's the center frequency of antenna

Each antenna has a certain frequency range called bandwidth. In the range, the antenna has the lower impedance and the highest efficiency, which is equivalent to a band-pass filter. The best frequency point in the middle of the frequency range is the center frequency, its SWR is the lowest, and the efficiency is higher.  ...

Read more  Amateur Radio,  Antenna,  center frequency

Something about Busy Channel Lock-out Function

Busy Channel Lock-out feature often abbreviated to BCL on two way radios. But it depends on the different radios, on some radio it says BCL, this is also commonly referred to as TX Inhibit on some other radios. For example, on Retevis RB17P, it says "Busy Lock". but on Ailunce HD1 it says" TX Authority".    ...

Read more  BCL,  Busy Channel Lock-out,  Retevis RB17P,  AilunceHD1

Frequency Sweep Feature on Retevis RA685

Radio frequency sweep or frequency sweep or RF sweep apply to scanning a radio frequency band for detecting signals being transmitted there. On Retevis R685 analog radio, you can do a frequency sweeping.   ...

Read more  Radio frequency sweep,  frequency sweep,  RF sweep

Is There a Good Radio Recommend for Entry Level Amateur

We often get some questions said" is there a good radio recommend for me entry level amateur? Maybe you are just starting into ham radio and you have no clue what possibilities are even out there. Let us talk about it in this article.  ...

Read more  AilunceHD1,  amateur radio,  ham radio

New 5W Dual band Ham Radio Retevis RA685

Retevis RA685 is EU version dual band ham radio. The transmit frequency is 144-146Mhz,430-440Mhz, and the receive frequency is 136-174Mhz,400-480Mhz;  ...

Read more  Retevis ham radio,  Retevis RA685 analog radio

Features of Digital Radio Vocoder

Vocoders are basically used for digital coding of speech and voice simulation. The bitrate for available narrowband vocoders is from 1.2 to 64 kbps.  ...

Read more  Vocoder,  digital radio vocoder

What's the meaning of DOUBLE and SINGLE for the RPT-MOD setting of Retevis RT23

Retevis RT23 is a cross-band repeater HAM Radio, but do you find it can set double or single repeater mode? What's the difference between the two modes?  ...

Read more  Retevis RT23,  DOUBLE RPT MODE