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Re: raduino problem

 

More info from HFSIGS information site

Inductor data

The inductors used on the board as follows:
  • L1, L2, L3?: 6uh, 40 turns on T30-6 core
  • L4?: Only needed the analog VFO, 9uh, 50 turns on T30-6 core
  • L5?: just a jumper on the standard bitx40, you will have to an inductor of a few uh to pull the BFO down for upper-sideband
  • L6, L7?: 1.1 uh, 17 turns on T30-6 core
  • L8?: 10 turns on FT37-43
  • T1,T2,T4,T5,T6,T7?: 10 turns trifilar on FT 37-43 core

The L1,L2,L3,L4 need a wire gauge thin enough for the large number of turns. We use 36swg enamelled copper wire, you can use thinner wire if you have any. The rest of the transformers and inductors have use 28 swg.

Note: The L4 is not required with the Raduino or any other digital VFO. The L5 is needed only if you want to operate USB (to pull the BFO to the lower slope of the crystal filter).


On Wed, Nov 1, 2017 at 2:40 PM, Larry Smith <815cpu@...> wrote:
From the HFSIGS.com He shows 50 turns for L4 and you will need the trim cap C93.

I was reminded with Farhan suggestion on the tuning pot.? I have had a 10turn 10K pot open on my receiver and it did the random drift and jumping frequency.? I reconnected the original kit 10k provided and it proved to be the 10k 10 turn pot I had was open.??

I noticed before the 10k 10turn failed that the mechanical feel was getting rough as time went on then it opened. Replaced it with better pot.

Also the Si5351 gets its 3.3v from the Nano on board regulator.? Pin 2 on the Nano should show 3.3 volts.? Could be a bad Nano.? Cheaper to replce the nano in that case.

You can go to:? ? ?

HFSIGS will show most everything there you may need.

73



On Wed, Nov 1, 2017 at 1:25 PM, sarnese via Groups.Io <sarnese@...> wrote:
hi Larry
yes i have checked all your tips according with schematic the ground pin are 12 and 13
cheked with digital oscilloscope there isn't signal at pin 14 i think the si5351a don't work or it is damaged
to use at moment the rtx i will found the original vfo on board to complete with L4 and C93.
L4 wich toroid is? t37-6? how many turn i must made on it?
thank you
i will order a new si5351a to test the raduino board
73



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