[Not possible] Extend receiver band

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PY2GVY
Posts: 4
Joined: Sat Apr 03, 2021 10:47 pm
Location: Limeira SP Brasil GG67hk

[Not possible] Extend receiver band

Post by PY2GVY » Sat Apr 03, 2021 10:55 pm

Is it possible to low the UHF band to 350MHz ? We have a lot of services here from 350MHz to 380MHz.
TNX.

VK3KYY
Posts: 7481
Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia

[Not possible] Re:Extend receiver band

Post by VK3KYY » Sat Apr 03, 2021 11:27 pm

We tried this, but the receiver does not work reliably below 380Mhz

Some radios would operate at perhaps 375Mhz but only a few radios.

The actual spec on the RF chip is 400Mhz to 520Mhz. But we found all radios work from 380Mhz to 564Mhz.

OM8AMV
Posts: 75
Joined: Thu Jun 25, 2020 7:26 pm

Re: [Not possible] Extend receiver band

Post by OM8AMV » Sun Apr 04, 2021 7:00 am

And VHF extend band is from to ?

VK3KYY
Posts: 7481
Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia

Re: [Not possible] Extend receiver band

Post by VK3KYY » Sun Apr 04, 2021 7:13 am

Official values for VHF / 220Mhz / UHF are

{
.minFreq=13400000,
.maxFreq=17400000
},// VHF
{
.minFreq=20000000,
.maxFreq=26000000
},// 220Mhz
{
.minFreq=40000000,
.maxFreq=52000000
}// UHF


Range that all radios seem to support , hence the firmware allows

{

.minFreq=12700000,
.maxFreq=17800000
},// VHF
{

.minFreq=19000000,
.maxFreq=28200000
},// 220Mhz
{

.minFreq=38000000,
.maxFreq=56400000
}// UHF

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