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455 posts

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# 255499 14-Aug-2019 15:37
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Hopefully this is the correct place to post this, if not let me know and I'll ask a mod to move it.

 

I'm looking for a female F to male SMA connector for a SDR antenna for NOAA that I'm building. I am not having much luck with Jaycar and I really don't want to have to wait for a shipment from Ali-Express. I don't really need 10 of them (I can find a 10 pack on Fleabay for ~$11 but again, a month shipping). Does anyone know someplace in NZ where I might find them? I checked GoWireless as well (where I accidentally bought an FME to SMA instead of F to SMA), and can't see them there either. Even if it's a female-female that's fine I an use a plug for that. Any suggestions would be welcomed, cheers.

 

 


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6827 posts

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  # 2299347 14-Aug-2019 16:18
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Hi, not sure of who would have that ex stock, remember its a 75ohm SMA you need, which is not that common, but try digi-key and pasternak

 

Cyril




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Ultimate Geek

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  # 2299348 14-Aug-2019 16:22
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Thank you, I'll check them. 50 or 75 would work fine for this use case. My sdr has a 50 ohm connection.

 
 
 
 


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  # 2299351 14-Aug-2019 16:24
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ummm, so its a 50ohm SMA on the antenna, whats it connecting to? from what you say a 75ohm F connectorised Rx?

 

Cyril


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Ultimate Geek

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  # 2299356 14-Aug-2019 16:35
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If you are in Christchurch, I have a 150mm SMA Male to SMA Female Bulkhead lead you can have. (0$)

 

New in bag. Got them for an SDR project.


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  # 2299358 14-Aug-2019 16:39
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Try Go Wireless otherwise

 

 




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Ultimate Geek

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  # 2299359 14-Aug-2019 16:41
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cyril7:

 

ummm, so its a 50ohm SMA on the antenna, whats it connecting to? from what you say a 75ohm F connectorised Rx?

 

Cyril

 

 

I'm making one of these to hold me over until I can get everything (and the gumption) to make a QFH antenna.

 

Click to see full size




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Ultimate Geek

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  # 2299360 14-Aug-2019 16:43
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msukiwi:

 

If you are in Christchurch, I have a 150mm SMA Male to SMA Female Bulkhead lead you can have. (0$)

 

New in bag. Got them for an SDR project.

 

 

I'm up in Auckland unfortunately, I have a couple of SMA to SMA laying around I was just hoping to make it easier on myself with the coax to be honest. It's my first antenna build so I'm trying to keep it a bit simple as I'm not an expert with building them (or soldering, this is to help practice!).

I very much appreciate the offer though. Cheers.


 
 
 
 




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  # 2299361 14-Aug-2019 16:45
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sbiddle:

 

Try Go Wireless otherwise

 

 

 

 

I checked Go Wireless, unfortunately I didn't see any of them there (I did however accidently get a FME to SMA adapter there as I wasn't paying enough attention).


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  # 2299385 14-Aug-2019 18:20
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I might have a SMA to P75 / Belling lee, you could use an adaptor. I will have a look later tonight.

 

 

 

John





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Ultimate Geek


  # 2299531 15-Aug-2019 08:03
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@Taubin sorry but I cant find the connectors I am after.

 

I did find a SMA to Type N cable that is brand new and 3M long, I will have to find the spec of the cable to see if it is solid core or stranded. 

 

I cant easily see a type N (f) to SMA (m) adaptor.

 

You are welcome to the cable, I am in New Windsor in Auckland ( not far from the Motorway tunnels ) I do have some F connectors and a crimp tool ( not a compression crimp but a hex crimp ) if you want to give it a go.

 

There must be a F connector that is for stranded cable.

 

https://www.jaycar.co.nz/f-59-screw-assembly-connector/p/PP0709 will do + an adaptor.

 

John

 

 





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  # 2299542 15-Aug-2019 08:55
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SATTV:

 

@Taubin sorry but I cant find the connectors I am after.

 

I did find a SMA to Type N cable that is brand new and 3M long, I will have to find the spec of the cable to see if it is solid core or stranded. 

 

I cant easily see a type N (f) to SMA (m) adaptor.

 

You are welcome to the cable, I am in New Windsor in Auckland ( not far from the Motorway tunnels ) I do have some F connectors and a crimp tool ( not a compression crimp but a hex crimp ) if you want to give it a go.

 

There must be a F connector that is for stranded cable.

 

https://www.jaycar.co.nz/f-59-screw-assembly-connector/p/PP0709 will do + an adaptor.

 

John

 

 

 

 

Hi John,

 

 

 

Thank you very much for the offer. I actually just got off the phone with my father-in-law in CHC and he actually has one he's sending up for me. It just happened to come up. He's a retired electronics engineer so he has all sorts of things like this. I don't know why I didn't think of asking him earlier.

 

 

 

Thank you all very much for all of the help and offers it's greatly appreciated, and been very helpful for future projects. Cheers.


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  # 2299544 15-Aug-2019 09:01
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good to hear you've got it sorted.

 

at work, we use RS Components for things like this.

 

 




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  # 2299546 15-Aug-2019 09:04
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nitro:

 

good to hear you've got it sorted.

 

at work, we use RS Components for things like this.

 

 

 

 

I'll check them out as well for future items! Cheers!


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  # 2299550 15-Aug-2019 09:12
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Don't quote me on it, but believe there's been some fairly good NOAA reception with just poking a wire of right wavelength into the socket itself and sticking it on a windowsil vs making a real one with connectrs/cables to introduce loss too. 

 

It's VHF so not a nasty band, just needs some good filtering.

 

You notice a lot of the tutorials are NZ based on rtl-sdr.. seems we have quite the movement here.

 

https://www.rtl-sdr.com/rtl-sdr-tutorial-receiving-noaa-weather-satellite-images/ 




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  # 2299554 15-Aug-2019 09:19
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Oblivian:

 

Don't quote me on it, but believe there's been some fairly good NOAA reception with just poking a wire of right wavelength into the socket itself and sticking it on a windowsil vs making a real one with connectrs/cables to introduce loss too. 

 

It's VHF so not a nasty band, just needs some good filtering.

 

You notice a lot of the tutorials are NZ based on rtl-sdr.. seems we have quite the movement here.

 

https://www.rtl-sdr.com/rtl-sdr-tutorial-receiving-noaa-weather-satellite-images/ 

 

 

That's similar to what I'm doing now. I am just using the bunny ears that came with the RTL-SDR kit, it does pretty decently. Unfortunately where I am currently, I'm in a massive valley so getting reception is pretty bad. I've been going to a local (ish) bike park that's decently high and quite open near Whenuapai. I'm building the antenna more for the experience and for predictability than anything. I'll stick it on a fiberglass pole from mitre10 and keep it in my boot so I can just pull it out when I get a decent pass.

 

If anyone is interested in this stuff, the RTL-SDR blog is amazing for tutorials on all things SDR. I use an app on my android called ISS Detector it works quite well for tracking and notifying. I've also done some POGSAC and will be trying the METEOR N2-2 stuff as well. It's a slippery slope lol


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