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What are the hardware band limits of the radio

Posted: Mon Oct 26, 2020 7:58 am
by IU8OGE
VK3KYY wrote:
Mon Oct 26, 2020 5:57 am
Yet another development version update with more bug fixes.
* Removed 220 Mhz frequency range from band limits when using the CPS setting. (Bug fix, as the range should not have been included)
thanks VK3KYY going to test

which is the complete frequency band really supported by the gd77 hardware, that we can test?

Re: What are the hardware band limits of the radio

Posted: Mon Oct 26, 2020 8:48 am
by VK3KYY
The limits of the hardware are set to these values

{
.minFreq=127000000,
.maxFreq=178000000
},// VHF
{

.minFreq=190000000,
.maxFreq=282000000
},// 220Mhz
{

.minFreq=380000000,
.maxFreq=564000000
}// UHF


However the published spec of the RF IC in the radio is

{
.minFreq=134000000,
.maxFreq=174000000
},// VHF
{
.minFreq=200000000,
.maxFreq=260000000
},// 220Mhz
{
.minFreq=400000000,
.maxFreq=520000000
}// UHF

So we are pushing the radio beyond the limits of the RF chip from the data sheet

We tried to extend the range further, but the PLL in the RF chip will not lock reliably beyond the limits in the first list.

Re: What are the hardware band limits of the radio

Posted: Wed Apr 07, 2021 2:09 pm
by sfoto
so getting into 300-380MHz range even rx-only isnt feasible with RDA?

Re: What are the hardware band limits of the radio

Posted: Wed Apr 07, 2021 9:07 pm
by VK3KYY
The RF IC simply can't operate in this range.