Rx wider frequency range
Re: Rx wider frequency range
I had no opinion for extended UHF frequency range. But I do not recommend to extend VHF frequency down to 12xMHz for following reason.
1:The civilian aeronautics use 118-137MHz in AM. Since the RDA1846 does not support AM at all,it would be meaningless to use RDA1846 to receive 12x-137MHz.
2:Support TX in 12x-137MHz in FM would be meaningless,and might cause harmful interference to civilian aeronautics.
I recommend the author could reserve extended frequency in source code,but restrict to within 136-174MHz in binary F/W to prevent unintentional abuse.
1:The civilian aeronautics use 118-137MHz in AM. Since the RDA1846 does not support AM at all,it would be meaningless to use RDA1846 to receive 12x-137MHz.
2:Support TX in 12x-137MHz in FM would be meaningless,and might cause harmful interference to civilian aeronautics.
I recommend the author could reserve extended frequency in source code,but restrict to within 136-174MHz in binary F/W to prevent unintentional abuse.
Re: Rx wider frequency range
The official firmware already does this range, if you change the band limits in the codeplug. Most people already did this.
Re: Rx wider frequency range
There is no RF stage for the range from 174 - 400Mhz, but I found it was better to enable the UHF PA and the UHF Rx amp, because if I use the VHF RF sections for this range, the Rx sensitivity is low.
Its not possible with the way the firmware is written to use a different RF section for the Rx to the Tx.
And the change to make the best use of the baseband RF chip are intended for Rx.
Re: Rx wider frequency range
Radio #1:
127 - 178
190 - 282
380 - 564
127 - 178
190 - 282
380 - 564
Re: Rx wider frequency range
HI.MY BAOFEN DM-1801 IN TX WORK:
136000 to 172000 - vhf
381000 to 500000 - uhf
does not work at 200 mhz, is this so? Can someone make it work in that band correctly?
73
136000 to 172000 - vhf
381000 to 500000 - uhf
does not work at 200 mhz, is this so? Can someone make it work in that band correctly?
73
Re: Rx wider frequency range
Hi,
If I verify that exactly, then I have another one that in uhf I cannot achieve that transmits in hotspot mode in uhf, I don't know if this problem has happened to someone. Do you say that in the 200mhz band in rx and tx it has the same range? and what power does it offer?
thanks
If I verify that exactly, then I have another one that in uhf I cannot achieve that transmits in hotspot mode in uhf, I don't know if this problem has happened to someone. Do you say that in the 200mhz band in rx and tx it has the same range? and what power does it offer?
thanks
Re: Rx wider frequency range
It has installed the last fw dated 04/18/20 where the frequency expansion is, as it is in beta, I am interested in trying and seeing what errors can be corrected.
73 javier
73 javier
CX2JO wrote: ↑Mon Apr 20, 2020 1:54 pmHi,
If I verify that exactly, then I have another one that in uhf I cannot achieve that transmits in hotspot mode in uhf, I don't know if this problem has happened to someone. Do you say that in the 200mhz band in rx and tx it has the same range? and what power does it offer?
thanks