[hpsdr] Radio Heads

[Helmut Oeller]

Hi,

there are many good  reasons in communciations to put the 'radio head' 
close to the antenna(s). Especially at microwave and/or high bandwidth 
requirements this approach is often the the most economic way. Modern 5G 
or  6G networks as well other commercial LAN, WLAN and MAN concepts 
follow that way.

For  our ham world a impartial evaluation seems me necessary: Frequency 
range, required data bandwidth (full duplex), max. distance antenna/ 
server, link options like ethernet, coaxial cable or wireless and after 
all the cost of the solution. How many hams need a such a split 
installation?

You see many questions and few answers, hi.

73, Helmut, DC6NY

Am 01.05.2023 um 21:09 schrieb ad0es:
> ***** High Performance Software Defined Radio Discussion List *****
>
> James,
>
> I've just started to take my Phoenix receiver in that direction (more 
> or less), go to May 1:
>
> https://community.element14.com/technologies/fpga-group/b/blog/posts/direct-fourier-conversion-software-defined-radio-using-cuda-processing 
>
>
> With RX only antennas, there isn't exactly a "head", but this would 
> place the ADC within a few feet of the antenna connection. The 450' to 
> the shack won't
> incur any loss as its digital by then. And it allows the antennas to 
> be in a much more optimal location, ie. the top of my mountain, not 
> down in valley behind hills.
>
> Steve AD0ES
>
> On 5/1/23 4:26 AM, James wrote:
>>
>> I see that there is a trend in other sectors, such as Satellite 
>> ground stations, to put a Digital Radio Head actually on the antenna.
>>
>> The Radio head contains:
>>
>> Analogue filter / pre-conditioning and analogue down mixer, ADC and 
>> SFP+ 1/10G Ethernet fibre output using Vita 49.2 packets to send the 
>> digital I/Q.
>>
>> For example:
>>
>> Antenna -> RH attached to antenna -> 1/10G optic fibre cable -> SDR 
>> receiver in-doors.
>>
>> An alternative to this is a Radio head that transmits the RF analogue 
>> over fibre.
>>
>> In both cases it reduces the cable loses to essentially zero due to 
>> the use of fibre optics in for the transmission line.
>>
>> The Transmit would place the HPA on the antenna also.
>>
>> Satellite Comms tends to use 1Ghz or above, with general TX powers of 
>> 15W and generally low RX S/N. This is quite a contrast to the lower 
>> 1-30Mhz bands, where TX powers can be above 100W and generally higher 
>> RX S/N
>>
>> Is this appealing to the openhpsdr community, or is it considered too 
>> expensive to be seriously considered?
>
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