开云体育

The subject says the basics of it. I installed my highest frequency LPF in position 5 on the? LPF relay board (20m) and put the 40m LPF on the U3S board. I also removed the W0/W1 and W2/W3 jumpers per the instructions, and as far as I can tell I did all the things correctly. When I took the U3S down for the upgrade it was getting spots regularly and had been for 2-3 weeks. But now, nothing. I connected the antenna to the vertical SMA connector with some RG58 going to a BNC connector, which has continuity. The only glitch I found was that I had installed one of the jumpers incorrectly. Now, I may repurpose this later, so I built the board using header pins with standard PCB jumpers like what are using in PC's on the motherboard, and so it was as easy as soldering in the correct pin and moving the jumper over to it.?

I also did some troubleshooting by leaving an LPF socket on the U3S board empty (it's shorted by the relay as far as I can tell, until the relay is energized) and tried transmitting on both 20m and 40m WSPR by switching out the correct LPF in position 5 on the board- no change, no spots. I AM getting spots locally with a rx sitting right next to it- it just seems like the RF isn't making it past the LPF relay board. Any troubleshooting suggestions? Thanks a lot! 73

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Ryan Flowers W7RLF

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I am sorry, I misquoted my own self! Yes, it's in position 1, not 5. The 20m is in 1, the 40m on the U3S board.

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Ryan Flowers W7RLF

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I would check with an Ohm meter the DC continuity from PA to antenna.
My guess is that you missed some jumper or connected the antenna at the wrong point.

Jan

I checked continuity through from the PA to C5 and then from C5 I'm not entirely sure where it's supposed to go from there. Perhaps someone could guide me on the correct RF path through the riser connector and the LPF relay board.. And it seems like it should go to antenna even when it's powered off- is that correct??

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Ryan Flowers W7RLF

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Things to check: 1 You didm't mention whether you installed the relay on the U3S board.? Assuming that you did, 2. Check all diode orientations on both boards, 3 Re-check jumper connections, I? think you are using pin headers and shorting pins, if so make sure the shorting pins are shorting the header pins together, causing the correct option. In the U3S menu when you set up the frequencies make sure LPF on U3s board is set to 0 and the one on position 1 is set to 1. Keep checking and double checking your solder work and for solder splashes, Good Luck Bill KN8DMK

Hi Bill and all,

I appreciate the guidance thus far. I've done the continuity checks, gone though all the solders and touched up a couple that looked iffy, and checked continuity with a LPF installed in position 1 and 0 and I have continuity between C5 and the antenna jack. The only thing I can think of is that I screwed up the PA bias when I installed the LPF relay kit. I'll check that tomorrow, it's been too long a day already. Here's some pictures of my build in case anybody can spot any obvious issues.



Thanks for the support, guys. I feel like I'm going crazy here! Even worked some FT8 to make sure my antenna system hadn't gone wonky LOL.
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73!? ? ? ? ?

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Ryan Flowers W7RLF

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I tracked all of this down to a bad BNC connector, I believe the chassis mount connector I have is 75ohm. The center pins are different sizes. Have it running great now on both bands :)
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Ryan Flowers W7RLF

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