[evlatests] ea24 L-band

rperley rperley at nrao.edu
Tue Nov 24 17:42:59 EST 2020


Rob:
I don't have recent L-band data, but do have C and X b and from Saturday 
night.  These looked fine to me.
Certainly your plan looks like the right thing to do.

Rick

On 2020-11-24 16:59, Rob Long via evlatests wrote:
> Hello everyone,
> 
> We have an L-band receiver on ea24 that has an oscillating LNA. This
> oscillation is severe enough that it is radiating out of the feed
> interfering with other bands as well. We can see SDRs jumping around
> on S, C and X-bands when the L-band biases are jumping around. When we
> turn off the biases, the SDRs return to normal on all other bands. We
> put the L-band in standby for the night and would like to swap this
> receiver on ea24 in the morning.
> 
> I spoke with Gene and he doesn't see a problem, but I wanted to float
> this around to make sure there is no problem. Please let me know as I
> will assume that no response is the same as permission! LOL
> 
> Thanks,
> 
> Rob
> 
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