Frequency hopping experiments on the NRF24

Any old or new electronic projects on the go
Tobe
Posts: 266
Joined: 16 Feb 2018, 06:19
Location: Varberg or Stockholm, Sweden

Re: Frequency hopping experiments on the NRF24

Post by Tobe » 12 Sep 2020, 06:59

...mm
Did you choose any alternative/choice for the board you like. I placed an order of one just to verify and it worked flawless. Without doing this initial choice it didn't take any order

bluejets
Posts: 108
Joined: 19 Jun 2019, 04:09

Re: Frequency hopping experiments on the NRF24

Post by bluejets » 12 Sep 2020, 23:32

Yes, did that.
I'll give it another go later today.
NBN around here can be a right pain sometimes so can only put it down to that.

Tobe
Posts: 266
Joined: 16 Feb 2018, 06:19
Location: Varberg or Stockholm, Sweden

Re: Frequency hopping experiments on the NRF24

Post by Tobe » 13 Sep 2020, 06:10

PM for how many you need as i might be able to help you there

Tobe
Posts: 266
Joined: 16 Feb 2018, 06:19
Location: Varberg or Stockholm, Sweden

Re: Frequency hopping experiments on the NRF24

Post by Tobe » 15 Sep 2020, 15:02

Got this message as I placed and order of 2 just to check:
"
Dear Friend, we will double check the version before we ship it , please don't worry about it.

"

RichardT
Posts: 11
Joined: 03 Mar 2019, 17:15
Location: Surrey

Re: Frequency hopping experiments on the NRF24

Post by RichardT » 15 Sep 2020, 21:35

At last I have 3 'plus' 250kbps rf-nanos :D , return postage refunded, and 3x 1mbps versions to play with. I can't really fault Keywish, they did sort it out in the end. Hopefully our efforts have saved others some time.

bluejets
Posts: 108
Joined: 19 Jun 2019, 04:09

Re: Frequency hopping experiments on the NRF24

Post by bluejets » 16 Sep 2020, 00:41

Tobe wrote:
13 Sep 2020, 06:10
PM for how many you need as i might be able to help you there
Thanks but I guess I will work it out one day, no rush at the moment.
For an update, still cannot get what I want.
It seems for some strange reason that there are something like 9500 plus of these things in stock BUT they will only sell me one.
Never used this Aliexpress before so maybe that is the reason, this seems crazy though.
In reference to the image enclosed where I signed in and selected the required model, the numbers area is greyed out and I cannot change the number I need anywhere, even after going to the checkout.

(1 piece at most per customer) ...????????..strange way to operate a business...

Thought it could be to do with this low price special but I cannot get past that either.
I find ones for $3 to $5 odd but they keep flicking back to this "special price" one at one off only.

Just thought I'd include the details here for others that may have the same problem but sadly no answers.
Attachments
ExampleAliExpress.jpg

Tobe
Posts: 266
Joined: 16 Feb 2018, 06:19
Location: Varberg or Stockholm, Sweden

Re: Frequency hopping experiments on the NRF24

Post by Tobe » 16 Sep 2020, 05:52

It looks to me that first you have to take advantage of the new customer deal after which you should be free to order as leisure! Just for the sake i opened a new account under my son's name and his postal address and encountered your issue.
Attachments
Screenshot_20200916-065120_AliExpress.jpg

bluejets
Posts: 108
Joined: 19 Jun 2019, 04:09

Re: Frequency hopping experiments on the NRF24

Post by bluejets » 16 Sep 2020, 14:51

Ok...thanks Tobe.

Like I said, strange way to do business .... :(

Tobe
Posts: 266
Joined: 16 Feb 2018, 06:19
Location: Varberg or Stockholm, Sweden

Re: Frequency hopping experiments on the NRF24

Post by Tobe » 16 Sep 2020, 17:22

....I'm more than happy to ship you a few if you tell me how many you need and PM a post address to send you a few

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Phil_G
Posts: 427
Joined: 15 Feb 2018, 23:32
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Re: Frequency hopping experiments on the NRF24

Post by Phil_G » 22 Sep 2020, 19:46

I've been testing a 'screened' version of the NRF24L01+PA+LNA and it appears to be a significant improvement over the previous 'open' versions. After finding a few NRF+PA+LNAs intermittently misbehaved at full power, I did some interweb digging and apparently its not uncommon - I found several reports where on full-power it seems to 'swamp itself' with stray RF and hand-shielding improves the throughput... I've found that either kitchen foil or groundplane wires improve it, but the troublesome ones seem to 'misbehave differently' :D so its hard to pin it down to one 'cure-all' solution. I should emphasise this is only on a few random NRF+PA+LNA chips, not all by any means.

These shielded ones appear to be perfect, they do 250kbps, they're unaffected by the presence of hands, metal cases, close rx proximity, etc - AND - they have an FCC approval stamp!
They also claim to use genuine Nordic chips :D Theres no easy way to tell if this is actually the case.

IMG_20200922_194511.jpg


I've tried them at 1mbps and 250kbps with no problems whatsoever. They are connected exactly the same as the previous 'open' PCBs so the standard 'power adapter' thingy fits perfectly, just plugs in. They do look as though they're made to a higher standard - and all the SMA connectors are perfectly square - some of my early NRFs look quite roughly made and have SMAs that are not quite true.

They were a bit more expensive at £2.50 but thats still cheap in my book when Frsky want £45 for a hack-module. Heres the Aliexpress link I used, I think I'll order some more.
https://www.aliexpress.com/item/4000132850562.html


IMG_20200922_191902.jpg

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