Eric Jacobsen wrote:
> On 6/25/2009 5:10 AM, recoder wrote:
>> On 25 Haziran, 10:59, "Sebastien @ Sundance"
>> <maury.sebast...@gmail.com> wrote:
>>> On Jun 24, 11:15 pm, recoder<kurtulmeh...@gmail.com> wrote:
>>>
>>>> We are used to process 70 Mhz IF by using ADC boards to interface to
>>>> our fpga boards.
>>>> Now we have to process the following signal:
>>>> 720 Mhz IF
>>>> qpsk modulated
>>>> 80 mhz bandwith (3 dB)
>>>> Can anybody recommend a board to interface the 720 Mhz IF to a FPGA
>>>> board?
>>> If you are looking at a complete system, you can check the SMT702 that
>>> may do the job
>>> :http://www.sundance.com/web/files/pr...RFilter=SMT702
>>>
>>> - Sebastien
>>
>> Thank you for your recommendation but I think downconverting 720 mhz
>> to 140 or 70 Mhz would be a better solution. I am looking for a board
>> that can do the job.
>
> You seem to be looking for a UHF to 70MHz downconverter. There are
> lots of UHF tuners with 70MHz outputs, but many/most are for broadcast
> applications and only support bandwidths up to about 8MHz.
>
> You may be able to find something with a bandwidth as wide as you're
> asking (80MHz), but I suspect you'll have to look around and it won't be
> cheap. That's a pretty wide bandwidth and most applications don't need
> or support that much.

A bandwidth of 80 XHz at a frequency of 70 XHz is pretty extreme at for
any value of X.

Jerry
--
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯