Re: T41 receive attenuator working?
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Thanks Jerry.? I now have 3 boards built with the attenuator and the spectrum doesn't move up and down on any of them.? I'll try monitoring right at the attenuator with a sig gen input.? It is a difficult chip to install and I'm guessing I don't have it soldered on all pins.
dave, n3ds
When I change the attenuator, I can see it clearly across the entire
spectrum display.? Everything just moves down.
? ? ? ? ? ? ?- Jerry, KF6VB
On 2025-01-31 17:15, D Solt via wrote:
> Thanks Oliver. I¡¯ll try this
> dave
>
>> On Jan 31, 2025, at 6:14?PM, Oliver KI3P via
>> <oliver=[email protected]> wrote:
>
>> ?
>>
>> Here's one way to test it.
>>
>> Load the latest code onto the Teensy. It has an option under the RF
>> set menu to change the input attenuation.
>>
>> Then, put a 10 MHz (or whatever) signal into the RF_in SMA connector
>> and hook an oscilloscope or spectrum analyzer to the output side of
>> the attenuator bypass jumper.
>>
>> You should see the signal amplitude change when you adjust the RF
>> input attention setting in the RF menu.
>>
>> -------- Original Message --------
>> On 1/31/25 9:46 AM, D Solt via wrote:
>>
>>> How do I tell if the receive PE4302 attenuator is working.? I
>>> can't tell any difference in received signals at whatever settings
>>> or when I jumper it out.? I have two RF boards built up and they
>>> behave the same.? Before I swap the chips out, I wanted to get
>>> some inputs. I haven't gotten to testing the transmitter circuits
>>> yet.
>>> dave, n3ds
>
>
>
> Links:
> ------
> [1] /g/SoftwareControlledHamRadio/message/32529
> [2] /mt/110916510/243852
> [3] /g/SoftwareControlledHamRadio/post
> [4] /g/SoftwareControlledHamRadio/editsub/243852
> [5]
> /g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy
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