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| Kontron/Tabor 6010 universal counter still worth getting? |
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| Ash:
Cool. Nice work. The unused NAND U4.4 should have its inputs tied to a rail so they don't float. What about using U4.4 as an additional buffer between the multiplier and the output? If you do that, you may want to add a second decoupling cap to the NAND chip at 1nF or 10nF or both.. As for the input 10Mhz, the TCXO / PLL board in my 6030 has the input coax soldered to pads on the PCB. This is on the upper left of the board in the photo I shared before. Probably the decider would be how easy it is to add remove the board and if you think you will need to. The SMB is the 500MHz output and the other end is soldered onto the PCB directly (I think it replaces the series resistor from the 10Mhz internal line. The 100Mhz through the pin header is probably ok, but the 500MHz was clearly pushing it so they didn't use it. Maybe prudent to include pads to launch to a bit of coax and a 0 ohm link to isolate the pin on the connector in case there are signal issues? That way you can jumper the signal to the main board with coax if you need. Actually, if you just add some accessible ground next to the input of the series cap C1, you could remove that and launch to coax. Then you could use the existing cap on the main board, isolating it from the 10MHz line by pulling the associated series resistor and using its pads for the coax.. Ash. |
| 0xdeadbeef:
--- Quote from: Ash on March 05, 2018, 01:54:00 am ---The unused NAND U4.4 should have its inputs tied to a rail so they don't float. What about using U4.4 as an additional buffer between the multiplier and the output? If you do that, you may want to add a second decoupling cap to the NAND chip at 1nF or 10nF or both. --- End quote --- Good point about the floating inputs. Changed that. I'm not 100% sure why I would add another buffer between the multiplier and the output. Or do you mean to be able to output the 100MHz on the 10MHz reference BNC? --- Quote from: Ash ---As for the input 10Mhz, the TCXO / PLL board in my 6030 has the input coax soldered to pads on the PCB. This is on the upper left of the board in the photo I shared before. Probably the decider would be how easy it is to add remove the board and if you think you will need to. The SMB is the 500MHz output and the other end is soldered onto the PCB directly (I think it replaces the series resistor from the 10Mhz internal line. The 100Mhz through the pin header is probably ok, but the 500MHz was clearly pushing it so they didn't use it. Maybe prudent to include pads to launch to a bit of coax and a 0 ohm link to isolate the pin on the connector in case there are signal issues? That way you can jumper the signal to the main board with coax if you need. Actually, if you just add some accessible ground next to the input of the series cap C1, you could remove that and launch to coax. Then you could use the existing cap on the main board, isolating it from the 10MHz line by pulling the associated series resistor and using its pads for the coax. --- End quote --- Yeah, I saw that the 500MHz is connected directly through coax on your PCB. The PCB on my 6010 seems to look slightly different near the J4 jumper and I kinda trust that the header should work if this is the official approach. But yeah, I guess it makes sense to have a fallback solution in mind. Maybe I could even find the space for another SMA connector that is not populated unless the header connection causes issues. BTW: is that an SMB connector on your TCXO board? Since there must be like 10 connector types which all look the same (SMA, SMC, SMS and what not) and I'm somewhat uncertain which one to use. |
| Ash:
--- Quote from: 0xdeadbeef on March 05, 2018, 11:45:05 am --- --- Quote from: Ash on March 05, 2018, 01:54:00 am ---What about using U4.4 as an additional buffer between the multiplier and the output? --- End quote --- Good point about the floating inputs. Changed that. I'm not 100% sure why I would add another buffer between the multiplier and the output. Or do you mean to be able to output the 100MHz on the 10MHz reference BNC? --- End quote --- I was thinking between the ICS601 and the output to avoid loading it, but I just checked the datasheet for the ICS601, it has 25mA drive capability so no need. But since you mention it, having another jumper "beside" the output one to send 100MHz to the ref out connector might be useful during testing? How many features can you cram onto the board for fun ;D --- Quote from: 0xdeadbeef on March 05, 2018, 11:45:05 am ---Yeah, I saw that the 500MHz is connected directly through coax on your PCB. The PCB on my 6010 seems to look slightly different near the J4 jumper and I kinda trust that the header should work if this is the official approach. But yeah, I guess it makes sense to have a fallback solution in mind. Maybe I could even find the space for another SMA connector that is not populated unless the header connection causes issues. BTW: is that an SMB connector on your TCXO board? Since there must be like 10 connector types which all look the same (SMA, SMC, SMS and what not) and I'm somewhat uncertain which one to use. --- End quote --- Fall backs are good :) But as you say, the "official" ones use the J4 connector so it should be good so I wouldn't worry about a real connector - you wouldn't have one on the other end anyway. I'm not actually sure what the connector is - I remember it is push on, so not an SMA. I just assumed it was SMB. The parts list in the 6030 manual is helpfully vague: "CON RF MALE JACKSON". It looks very similar to the push on connectors in my HP 8595A spectrum analyser if that is of any help :-// As for what connector to use - what ever you have around is best - 100MHz isn't pushing any of them I guess.. |
| 0xdeadbeef:
So that's where I'm standing at the moment. There is no SMB connector in the 3D library, but I will use one anyway I guess. I actually thought of fancy options like an analog switch (e.g. 74HCT4066) that is controlled by a µC that monitors the external reference input and automatically switches to the external reference if it detects a signal there. Then again, I have enough unfinished stuff of that kind, so I want to keep it easy and simple. |
| Ash:
Nice work. My only suggestion would be to add a screw hole or two for mounting. Make it line up with the slots in the side of the case. My tcxo board is mounted using a screw through the tab of the regulator. You may need to arrange a standoff or something, but the screws just bite into the slot. Ash. |
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