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| Archer C7 v1 or v2 RF path resistance https://vlab.su/viewtopic.php?f=267&t=117393 |
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| westcoast [ 20 июл 2021, 18:35 ] | |
| Заголовок сообщения: | Archer C7 v1 or v2 RF path resistance |
Hi One of 2.4 antennas exhibited bad sensitivity, after poking with DMM it became even more unclear whether it operates as intended or not. If somebody has functional unit I'd like to know resistances of: R465, R469(CH0) R478, R474(CH1) R466, R472(CH2) |
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| westcoast [ 27 авг 2021, 04:37 ] | |
| Заголовок сообщения: | Re: Archer C7 v1 or v2 RF path resistance |
There is about 44Kohm on R465 and 4.7Kohm on R469, LNA on this chain have a bit over 3V R478 is 50Kohm with R474 is 10Kohm and here LNA is at exactly 2.5V. I think this chain is the only one without any damage. However both seem to work fine even if the first one have higher voltage. Replaced SPDT on CH2, the voltage on output has rised, replaced LNA as well but thats not all. Still getting the highest voltage on this LNA, about 3.2V. And R466 is sometimes 44Kohm, sometimes 29Kohm or even less while R472 was 9Kohm in best case, 2.5Kohm in worst case. When LNA chip is off the board then these resistors are the same as on CH1 - 50K and 10K. According to this the suspects are caps, to minimize board heating and taking them all off: which ones are more likely to have failed, the ones from LNA to radio, or the ones towards the SPDT? |
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| westcoast [ 04 дек 2023, 07:08 ] | |
| Заголовок сообщения: | Re: Archer C7 v1 or v2 RF path resistance [РЕШЕНО] |
either the soldering wasn't good, iron damaged chips or the first two from a pack of 10 were faulty (taobao). put new one, soldered with air, voltage seems to be in place - 0.78V just as on chain1 (0.78) and chain0 (0.75) |
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