Re: [gqrx] What the heck is the format for frequencies

[Robin Gape]

OK. For RF, and electronics in general, the SI—commonly called metric—system is used. Engineers are fond of multipliers of 10 to the power of 0, 3, 6, 9, 12…, because it makes things simple and consistent. Thus Hz, kHz, MHz, GHz (and THz for the truly adventurous!).

On the screen grab you will notice:

The received frequency [LHS] is given in Hz (cycles per second), and the decimal points indicate the MHz and kHz divisions. The hardware frequency is shown directly as MHz, in this case 102 MHz, and the frequency is also given as kHz in the box labelled Frequency, in this case 102000 kHz. A frequency may be directly entered in the Frequency box (including a decimal point if necessary). Frequency may also be changed by clicking on one of the numbers on the LHS received frequency display.

k is 10³, and M is 10⁶.

One can also set up bookmarks, which offers another way to change frequency.

HTH, 73, Stay Safe,

Robin, G8DQX

PS: In SI there's a big difference depending on upper or lower case. mm (all lower case) is a millimetre. Mm would be a thousand km. K, upper case, is a unit of temperature (the Kelvin), k, lower case, is a multiplier (by a thousand, 10³).

On 14/07/2021 04:37, — Delta-4 — wrote:

I just wanted to know how i format the frequency when i type it into gqrx.  Like what the subdivions are.  Like how for the metric system, you have (KM, HM, DM, M, dM, CM, MM).  I just wondered if there was something like that for rf.