Discussion in 'The Low Bands - 630/2200 Meters - VLF' started by W7UUU, Oct 8, 2018.
No. I want it to be 472 KHz tall
Interesting but I'm guessing that there would be no filtering at that frequency. Probably worth incorporating an external filter???
Try one of these and call me in the morning "G3XBM 472kHz Transverter"
That's pretty cool! Are you using one? If so, how's it working for you?
Just found it on random search.
Still hoping to hear from someone who may have tried this very simple-to-implement mod to the IC-7300. I do think a proper filter network on the output would indeed be in order.... just cuz it could transmit on 472 KHz via opening up the PLL/synthesizer, doesn't mean the "rest of the RF chain" ever planned to have that happen.
So you can open the transmitter freq limits, but is there a TX filter that can pass a signal out on 472-478 Khz, to the antenna ?
I can receive on the low band but no TX signal goes out there, on 2 of my rigs !
I too had the same question, and ended up finding this article: http://njdtechnologies.net/the-icom-7300-on-630-meters-by-david-g0mrf/
That's interesting. I found the SWR indicator on the 706Mk2 to be relatively accurate by comparison with what the 7300 seems to show. The MK2 still requires a low-pass filter on the output though, and the MK2 would also only do about 5 W RF out *but* nothing seemed to be straining (i.e. excessive current draw, radio chassis getting hot etc.). It just "runs out of gas" going that low in frequency.
I can imagine the price of WW2 surplus aircraft radios for VLF, Just shooting up higher and higher !