Thanks Rahul, will replace them to you ASAP.
I happen to have a Fluke thermo gizmo FLIR, looked at the power board and the driver section was RED hot.. the whole section! Then I unplugged the final board input and put in a +12 dbm in at 14.2 Mhz and did not get 100W. Looking at the data sheet of the upc1678 driving the final board showed that it has a max power of +18.. so I expected that the 756 should have put out max power with the drive I was measuring. Driving the final board with +16 got me about 25W, so my bet was on a defective device in the final amp board. Then I did some external fan cooling and viewed with FLIR and saw this device red hot! It was drawing some 8-10 amps !!!
See the attached image, the red part on the right is the regulators heat. The dark spot on the left is where the device I removed was. The whole section was red before I de soldered the device.
1A quiescent current per RD15.. is a bit baffling! The PA takes 4A doing nothing!
Lucky 2LBW the owner is very pleased !! We were goofing off like the doctors in M*A*S*H saying doctor - doctor to each other while trouble shooting!
Cheers
Raj, vu2zap
At 04-08-2012, you wrote:
Hi! Raj,
Have them with me at Delhi , currently on leave. Will mail a couple when I reach Monday next.
73's
Rahul VU3WJM
--- On Sat, 4/8/12, Raj <vu2zap@gmail.com> wrote:
- From: Raj <vu2zap@gmail.com>
- Subject: [HamBrewers] RD15HVF1
- To: hambrewers@yahoogroups.com
- Date: Saturday, 4 August, 2012, 4:33 PM
- Anyone in VU have RD15HVF1 ?, I need two numbers for an ICOM IC-756 Pro 3.
- I will order it on Fleabay but I thought I check with you guys.
- 73 & Cheers
- --
- Raj, vu2zap
- Bengaluru, South India.
Attachment(s) from Raj
1 of 1 Photo(s)
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