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I need to control the frequency on the 432 mhz band, I would like to be able to adjust to the khz, or 10 khz.
Ideally I could control the frequency on the 28-29 mhz band with lora or fsk.
I am testing with non commercial ham frequencies, very low rf power, dipole or moderate antennas.
The ue of the 432 and 28 mhz bands is an extremely strong need. I dont care the power a long a we can get 10 milliwats or so (a gpio pin pair, into a 50 ohm dipole)
Thanks, Bradshaw K1TE Buzzards Bay MA.
as an alternative question, is there a mixer, that I can use to et 432 or 819 mhz down to 28 mhz at the 10 mw level.
I’m having difficulty understanding the precise nature of your request; LoRa is a spread-spectrum protocol operating in the ~900MHz and 2.4GHz bands, Frequency Shift Keying is a modulation technique, and you’re speaking of “controlling the frequency” on 432 and 28 MHz. How exactly all these pieces fit together is not clear.
In regard to a mixer, well, yes there are such things; the family of mixer ICs is here, and evaluation boards for such are here, but it’s difficult to make suggestions more specific than this without a bit more context regarding the application.
Quite a number of countries do use 400mhz for Lora.
Further, FSK is a modulation method, it is absolutely supported on many Lora modules in addition the the standard spread spectrum modulation. You just need to configure the Lora module to use FSK.
One example of using FSK with an actual Lora network in the real world and on a standard chipset:
Then the mixer question implies putting this signal on the 10 meter ham band.
I personally would suggest if you are going to do all that, and you actual have some control on both sides of the comm link, think about using js8call with an API and a lower cost radio:
