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NanoVNA RF Demo Kit connection

Richard All Messages By This Member #18481 I have a new RF Demo Kit board that came with two connecting wires. One end is an SMA male connector and the other end is something that I have never seen before. It is supposed to connect to the test positions on the circuit board. I have not been able to make the connection because it is very resistant and may take a lot more force than I am willing to do before I learn more about it. Any suggestions would be appreciated. Richard KC9UB
Larry Rothman All Messages By This Member #18485 Rich, attach a photo so the rest of us know what you're looking at. toggle quoted message Show quoted text On Thursday, October 29, 2020, 9:19:46 a.m. EDT, Richard <raitchd@...> wrote: I have a new RF Demo Kit board that came with two connecting wires. One end is an SMA male connector and the other end is something that I have never seen before. It is supposed to connect to the test positions on the circuit board. I have not been able to make the connection because it is very resistant and may take a lot more force than I am willing to do before I learn more about it. Any suggestions would be appreciated. Richard KC9UB
Dave All Messages By This Member #18493 Use this link. /g/nanovna-users/wiki/16592
Jon-G0MYW All Messages By This Member #18494 hi Richard, I know what you mean - they are a 'very' tight fit, but soon loosen up . As some have suggested they only have a limited number of fittings.
Richard All Messages By This Member #18519 I appreciate all the great responses to my question that I received . My problem was that I could not apply enough finger or thumb pressure to make the connection. It was painful to try. I used a small dowel rod and was able to snap the fittings on the board. The information that was received was very helpful. Thanks to all. Richard KC9UB
Tom Twist All Messages By This Member #20408 I had the same problem with the U.FL connectors . I modelled a small tool to solve the problem, thinking it should be used to connect, and then removed. When I had made a test printout, I realized that it could be left on the U.FL connector. It will stick to the connector and cable. I have also made a small 8 mm wrench for SMA-connectors, I guess it will break before the connector is tightened too much. RF-DemoKitTools.jpg UFL-Male-Tool.stl UFL-Male-Tool.stl SMA_Wrench v2.stl SMA_Wrench v2.stl
Tom Twist All Messages By This Member #20409 Regarding the two 3D-printed tools I posted, use 0.15 mm (or 0.2 mm) layer height, and 100 % infill when slicing for 3D-print.
arnold slag #20424 Same problem here! toggle quoted message Show quoted text Op do 29 okt. 2020 14:20 schreef Richard <raitchd@...>: I have a new RF Demo Kit board that came with two connecting wires. One end is an SMA male connector and the other end is something that I have never seen before. It is supposed to connect to the test positions on the circuit board. I have not been able to make the connection because it is very resistant and may take a lot more force than I am willing to do before I learn more about it. Any suggestions would be appreciated. Richard KC9UB IMG-20210120-WA0027.jpeg
Rudi All Messages By This Member #20430 On Wed, Feb 3, 2021 at 08:52 PM, arnold slag wrote: Same problem here! Have a look in the wiki: /g/nanovna-users/wiki/16592 73, Rudi DL5FA
FRANCISCO JAVIER MURIEDAS ARGUMOSA All Messages By This Member #20462 I couldn't make even the small number of connections suggested with those little connectors. They died before. I put in parallel with each connector a pair of male-male pins used with IC sockets (2.54mm) and another pair of male-female pins at one end of each test lead. They won't be 50 ohms but their length is too small to be very bad at the frequencies involved. And they allow you to connect and disconnect hundreds of times (and are easy to change later). Regards
Schrille All Messages By This Member #35814 same here. This kit is absolutely scrap.after a couple of test,the mini connectors died The tread of one of these sma connectors is also bad After a few tries, I threw the whole board in the trash can.
W0LEV All Messages By This Member #35818 No, SMA connectors are not PL-259 by any stretch. But they are pretty much the standard for low-power microwave work. Dave - W?LEV On Fri, Mar 1, 2024 at 6:43?PM Schrille via groups.io <schnappie= [email protected]> wrote: same here. This kit is absolutely scrap.after a couple of test,the mini connectors died The tread of one of these sma connectors is also bad After a few tries, I threw the whole board in the trash can. -- Dave - W?LEV -- Dave - W?LEV
KENT BRITAIN All Messages By This Member #35820 Low Power Microwave work?????? Low Frequency as in the IF Connections? PL259-SO238?? Looks pretty bad at 1 GHz.? Worse higher than that. toggle quoted message Show quoted text On Friday, March 1, 2024 at 04:52:24 PM CST, W0LEV <davearea51a@...> wrote: No, SMA connectors are not PL-259 by any stretch.? But they are pretty much the standard for low-power microwave work. Dave - W?LEV On Fri, Mar 1, 2024 at 6:43?PM Schrille via groups.io <schnappie= [email protected]> wrote: same here. This kit is absolutely scrap.after a couple of test,the mini connectors died The tread of one of these sma connectors is also bad After a few tries, I threw the whole board? in the trash can. -- Dave - W?LEV -- Dave - W?LEV
W0LEV All Messages By This Member #35821 The popular SO-239 / PL-259 are miserable connectors above 30 MHz. They are not an impedance-controlled connector and may vary all over the place. SMA connectors are well specified and controlled (except from China). And, yes, low power microwave is their primary application. Because they are a good RF connector and considerably smaller than a BNC, they have also found their way into the amateur handi-talkies. Dave - W?LEV toggle quoted message Show quoted text On Fri, Mar 1, 2024 at 11:39?PM KENT BRITAIN <WA5VJB@...> wrote: Low Power Microwave work?????? Low Frequency as in the IF Connections? PL259-SO238 Looks pretty bad at 1 GHz. Worse higher than that. On Friday, March 1, 2024 at 04:52:24 PM CST, W0LEV < davearea51a@...> wrote: No, SMA connectors are not PL-259 by any stretch. But they are pretty much the standard for low-power microwave work. Dave - W?LEV On Fri, Mar 1, 2024 at 6:43?PM Schrille via groups.io <schnappie= [email protected]> wrote: same here. This kit is absolutely scrap.after a couple of test,the mini connectors died The tread of one of these sma connectors is also bad After a few tries, I threw the whole board in the trash can. -- Dave - W?LEV -- Dave - W?LEV -- Dave - W?LEV -- Dave - W?LEV
KENT BRITAIN All Messages By This Member #35822 We must credit the work of Mr Quackenbush at Amphenol for the firstconnector for the new Coax Cable 90 years ago.?? Yes, back then there was little work above 30 MHz so they filled a need.TDR a PL259-SO239 connection and they typically show about 30 Ohms. 3 cm of 30 Ohms in a long feedline like at 80 Meters is not a problem.?BUT!?? As the waves get shorter, it becomes a bigger deal. toggle quoted message Show quoted text On Friday, March 1, 2024 at 05:48:55 PM CST, W0LEV <davearea51a@...> wrote: The popular SO-239 / PL-259 are miserable connectors above 30 MHz.? They are not an impedance-controlled connector and may vary all over the place.? SMA connectors are well specified and controlled (except from China).? And, yes, low power microwave is their primary application. Because they are a good RF connector and considerably smaller than a BNC, they have also found their way into the amateur handi-talkies. Dave - W?LEV On Fri, Mar 1, 2024 at 11:39?PM KENT BRITAIN <WA5VJB@...> wrote: ? Low Power Microwave work?????? Low Frequency as in the IF Connections? PL259-SO238? Looks pretty bad at 1 GHz.? Worse higher than that. ? ? On Friday, March 1, 2024 at 04:52:24 PM CST, W0LEV < davearea51a@...> wrote: ? No, SMA connectors are not PL-259 by any stretch.? But they are pretty much the standard for low-power microwave work. Dave - W?LEV On Fri, Mar 1, 2024 at 6:43?PM Schrille via groups.io <schnappie= [email protected]> wrote: same here. This kit is absolutely scrap.after a couple of test,the mini connectors died The tread of one of these sma connectors is also bad After a few tries, I threw the whole board? in the trash can. -- Dave - W?LEV -- Dave - W?LEV -- Dave - W?LEV -- Dave - W?LEV

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