Re: [time-nuts] 5065A Rb Cavity Rx - SRD repair
Hi As part of your “simple replacement” … keep in mind that it needs to act both as a multiplier *and* as a mixer. The two modes need to be reasonably separate from each other or you (likely) get a real mess. Bob > On Oct 25, 2020, at 4:26 PM, Ulf Kylenfall via time-nuts > wrote: > > > Disassembled the surplus Rx cell by first disconnecting > the short jumper cable and then unscrewed the brass > part. Inside was a tiny diode, color coded "391" > as have been previously discussed in a thread some years ago. > > I recon that if a diode would some time in the future breakan external > multiplier featuring modern semiconductorsshould not be that hard to design > and connect directlyto the loop in the other end of the jumper cable. > > Actually, I was expecting something in a tiny ceramic > package with a UNF thread in one end and a gold plated > cap in the other. Not anything that looked like a 1N4148... > I could see that the bottom coax part of the SRD assembly > had been filled with curing silicone after the diode had been put in place. > Removing/replacing it would require using a drilland fixture but it should be > doable without > cracking the glass... > > Ulf Kylenfall > SM6GXV > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] 5065A Rb Cavity Rx - SRD repair
Disassembled the surplus Rx cell by first disconnecting the short jumper cable and then unscrewed the brass part. Inside was a tiny diode, color coded "391" as have been previously discussed in a thread some years ago. I recon that if a diode would some time in the future breakan external multiplier featuring modern semiconductorsshould not be that hard to design and connect directlyto the loop in the other end of the jumper cable. Actually, I was expecting something in a tiny ceramic package with a UNF thread in one end and a gold plated cap in the other. Not anything that looked like a 1N4148... I could see that the bottom coax part of the SRD assembly had been filled with curing silicone after the diode had been put in place. Removing/replacing it would require using a drilland fixture but it should be doable without cracking the glass... Ulf Kylenfall SM6GXV ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] 5065A Rb Cavity RX - SRD Repair
Thanks for the picture. The small coax link cable is even more brown than the one i my cavity I did realize that it should be possible to test the diode using a 20k/V resistance meter. There has been no more "hick-ups" and what the cause was is unknown, but many repair sessionscan of course have worn the SMB/SMC-connectors. Best Regards Ulf Kylenfall SM6GXV ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] 5065A Rb Cavity Rx - SRD repair
Hi The SRD is not easily accessible. Digging in to get it is going to involve a bit of work. The power level is going going to be a function of the cavity design. Apparently that design is “non-standard” so any number will be a guess. The 5065 manual shows typical RF voltage levels into the cavity. Bob > On Oct 22, 2020, at 4:31 PM, Ulf Kylenfall via time-nuts > wrote: > > > I see. > Is the SRD in the Rx module accessible at all? > What type of package is it? Is it possible > to dismantle the Rx unit without risk of cracking > the glass enevlope? > > Does anybody know the power level at 6 GHz? > > BR > > Ulf Kylenfall > SM6GXV > > > > > > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] 5065A Rb Cavity Rx - SRD repair
I see. Is the SRD in the Rx module accessible at all? What type of package is it? Is it possible to dismantle the Rx unit without risk of cracking the glass enevlope? Does anybody know the power level at 6 GHz? BR Ulf Kylenfall SM6GXV ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
