General > General Technical Chat
Help fixing a cracked/ detached "ceramic heat-pad".
Dan R. Hansen:
--- Quote from: Gyro on March 23, 2022, 12:56:33 pm ---
It's not Beryllium. If it was, there would be big bold warning labels on the heatsink / enclosure. Beryllium was only ever used in small quantities in the packages of specific RF semiconductor. There is some debate as to whether it was ever used in industrial magnetrons or other high power tubes (certainly not consumer).
Alumina and Beryllium still require thermally conductive grease (or maybe adhesive in this case) to fill the microscopic voids caused by surface irregularities on the semiconductor packages and also the surface machining of the heatsink. They are not a 'dry' solution. They are no different to Mica in this respect - the grease can still dry out. They just have higher voltage withstand than Mica or silicone pads [EDIT: and better RF properties).
--- End quote ---
It is Huawei after all. China operates in mysterious ways. :P It's differently not an "end user consumer product", so there is always that little chance of oddities.
Dan R. Hansen:
I found this documentation of some Huawei equipment. Beryllium Oxide is mentioned at section 2.1
The age of this equipment seems to be from 2007 or so. I am not sure. So Beryllium Oxide is not out of the question...
thm_w:
--- Quote from: Dan R. Hansen on March 23, 2022, 09:39:10 am ---I do actually believe the seller, because I could track the package, and it stopped in the airport, where it got delayed and rejected. It had been through many checkpoints before that, so I think it is safe to say, that they did in fact ship the item.
How, there were some "fuckery" going on before that. It was sold as free Fedex shipment included. But it ended of beign shipped with AliExpress "Premium" shipping.
I was not happy about it, at all. But there is practically nothing I could do about it. In the end though, the seller actually refunded all of the money the received from the transaction. AliExpress however, did fuck me over by keeping the mandatory VAT, that they were required to charge at the checkout. Fucking scumbags... :P
Last time I bought a unit like this, the seller didn't include the proper paperwork and documentation, resulting in me having to pay VAT twice. AliExpress dispute "judges" didn't understand the problem, and kept referring me to the rule, saying that seller is not responsible for extra fees beign applied by other governments...
--- End quote ---
Asking again, can you link the item page? Sounds interesting.
It isn't Huawei gear is it, that is banned from a number of countries for import.
The VAT thing I've heard reported a lot, no experience with it myself.
https://www.reddit.com/r/Aliexpress/comments/oxoncq/why_is_aliexpress_collecting_vat_and_not_paying_it/
https://www.reddit.com/r/Aliexpress/comments/plh1ml/double_charge_vat/
Dan R. Hansen:
--- Quote from: thm_w on March 23, 2022, 09:20:10 pm ---
Asking again, can you link the item page? Sounds interesting.
It isn't Huawei gear is it, that is banned from a number of countries for import.
The VAT thing I've heard reported a lot, no experience with it myself.
https://www.reddit.com/r/Aliexpress/comments/oxoncq/why_is_aliexpress_collecting_vat_and_not_paying_it/
https://www.reddit.com/r/Aliexpress/comments/plh1ml/double_charge_vat/
--- End quote ---
The link I used is down, but you can just search "R4850G2" on Taobao or Aliexpress. They are sold everywhere. But please know, if you all start searching for it, the prices will go up permanently.
https://youtu.be/_IKTpq7bXoI
I looked at those reddit links before. It seems a lot of people are frustrated with the amount of shit Aliexpress and some Chinese sellers come up with.
thm_w:
--- Quote from: Dan R. Hansen on March 23, 2022, 09:31:27 pm ---The link I used is down, but you can just search "R4850G2" on Taobao or Aliexpress. They are sold everywhere. But please know, if you all start searching for it, the prices will go up permanently.
https://youtu.be/_IKTpq7bXoI
I looked at those reddit links before. It seems a lot of people are frustrated with the amount of shit Aliexpress and some Chinese sellers come up with.
--- End quote ---
R4850G2 is Huawei gear, but it doesn't look like Denmark has banned it.
https://www.beyondlogic.org/review-huawei-r4850g2-power-supply-53-5vdc-3kw/
https://www.youtube.com/watch?v=U9LE8FThbPU
""亲 带电带磁 不可以空运 严格的来说 部分物流不能承运"
This translation seems to mean, charged batteries and magnets are not allowed. This is neither, but, maybe it was incorrectly labeled for customs (eg as a battery charger, but charger part cut off, etc.).
You can always call up Fedex and ask for specifics.
What are you using it for?
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