[amsat-bb] 70cm LNA

[Zach Metzinger]

On 08/12/20 13:54, Kevin Elliott wrote:
> Are there any complete built filters to inline by chance from any retailer?

Hello Kevin,

I do not know of anyone offering this filter, and it isn't something 
you'd want to transmit through. I don't even know how much power it 
would survive before releasing the magic smoke (probably < 1W).

The SAW filter is on the output of the LNA chip, so it is switched out 
during TX. You could take your LNA apart and tack this in to achieve the 
same effect. You'd laugh at the component-on-it's-side soldering job 
with 30ga wire-wrap wire, but it works!

I plan to lay out a board and release it to the community with build 
instructions. However, I have another project or two in front of that 
before I have free time.

--- Zach
N0ZGO