If you are concerned about heat dissipation of the whole transceiver than I recommend you my solution.
First change the 5V linear regulator with a SMPS one in SIP3 capsule (look after my previous messages on the list). This will reduce a lot the heat.
Second, use the metal plate over the T1 as has been should in the previous picture.
With only these changes you will be on the safe side. I run QDX 24/24h for weeks without any issue and after half an hour of key down the whole case got stable to around 40C in about 28C room temperature.
PA MOSFETs are not a problem in terms of heat dissipation therefore they don't need more heat sink on top of the existing one.
73 de YO3FFF
Cristi
Pe miercuri, 24 august 2022, 20:21:04 EEST, KC9REN <deanberg2044@...> a scris:
On Tue, Aug 23, 2022 at 02:49 AM, cris blak wrote:
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Have a look to the att. picture. I've used a metal strip cut from a tin can.
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73 de YO3FFF
Cristi
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Pe mar?i, 23 august 2022, 07:53:05 EEST, Zhihao.VK2NJR <poporange630@...> a scris:
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Can't we use some thermal pads to dissipate heat to the aluminum case?
This helps for the heat generated by the transformer but what about the 4 Mosfets heat? Anyone come up with a better idea for these? I've seen something about someone suggesting using a U shaped piece of copper under the Mosfets but has anyone tried this yet? Does it do any good being in the enclosure unless it's attached to the case? Heat is generated by these Mosfets for sure. Dean KC9REN
