High SWR and Power - Bad transformers connections ?

KY4LV
 

Posts: 1
Joined: 03 Sep 2022, 22:20

Re: High SWR and Power - Bad transformers connections ?

Post by KY4LV »

ng1p wrote: 01 Nov 2022, 16:02 I have built 3 full kits so far. The original low band worked fine. Both of the new ones with the updated RF board using Q5 and the updated T2 both show 9.99 SWR and 0 power out as talked about. The two new kits are one for the classic bands and the other for the high bands. Both radios work great it’s just the power/SWR function does not. What is the true fix for this? I assume anyone building the newer boards will have the same issue.

Can someone point me to a post that talks about what components need to be replaced to make this work?

Thank you Bill NG1P
I'm in a similar situation - I ordered a kit complete with RF and Low boards which show power and SWR normally. In that same order, I got a High board which has the power/SWR issue.
DL2MAN
 

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Joined: 30 Dec 2021, 19:18
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Re: High SWR and Power - Bad transformers connections ?

Post by DL2MAN »

Please post a detailled picture of your T1 and T2 Transformers on the affected Boards.
It´s most likely either: cold solder joint or not wound in the right direction.

73 Manuel; DL2MAN
ng1p
 

Posts: 5
Joined: 31 Dec 2021, 14:17

Re: High SWR and Power - Bad transformers connections ?

Post by ng1p »

In my case I inverted the coil. Not sure what I was thinking! I had the primary coil on T2 going underneath the the core to the thru hole. I should have taken a picture of the bad one. Here is a close up of what a good one looks like. See attached. Note: the wire as it comes thru the core stays on that side of the to the same side thru hole on the board.

73 Bill NG1P
Attachments
AC3CED69-F55C-4799-8CE2-422E6E719ED3.jpeg
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E9DA7DD1-49A1-4FF2-A08B-4A0C5CCCB850.jpeg
E9DA7DD1-49A1-4FF2-A08B-4A0C5CCCB850.jpeg (153.52 KiB) Viewed 645 times
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