[evlatests] P band summary

[Dan Mertely]

Rob Long & I (I was in the antenna), tried to find the
source of the phantom P-band signals on antenna 01.  I
checked to see if anything was coming down the coax into
the LOIF rack (nothing was), only to discover that it didn't
matter since the rack didn't have a T301 (4/P converter).
So, the spurs must be generated after the T301 converter.

The T301 feeds the T302 (LSC converter), so Rob suggested
terminating the RCP & LCP 4/P inputs to the T302 while he
checked the bandpass for the strong "256 MHz" spurs.  No
change, indicating that the spurs are being generated inside
the T302 module (They can't be generated by the following,
T304 converter since the spurs are not seen in X, K, or Q
bands).

-Mert





Charles Kutz wrote:
> Ant 1 does not have a T301 installed and the receiver is disconnected in 
> the barrel. FE is waiting for some barrel work to be finished before we 
> repair the damaged coax and power cables feeding the receiver.
> 
> Ant 13 still has the very strong 330 MHz signal present in the passband, 
> so far we have not been able to find the cause. One day while 
> troubleshooting, it was discovered that it would go away when ever you 
> stepped down in an particular spot in the vertex room!
> 
> We will take a look at 26 LCP tomorrow.
> 
> 
> 
> Chuck
> 
> Ken Sowinski wrote:
>> I tried to see if we are doing anything wrong at P band.
>>
>> ea1 and ea13 are still confused for differing, known reasons.
>> ea16 is not yet outfitted
>>
>> ea17-l302-2 was in standby.  A command to a different frquency
>> made it happy again.
>>
>> ea21 BD and ea23 B could be helped by revised attenuator settings.
>>
>> ea26 LCP has low TP.  So low that even with the attenuators wide
>> open we still don't see adequate power at the sampler.
>>
>> No ther problems were seen.
>>
>> _______________________________________________
>> evlatests mailing list
>> evlatests at listmgr.cv.nrao.edu
>> http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests
> _______________________________________________
> evlatests mailing list
> evlatests at listmgr.cv.nrao.edu
> http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests