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Re: Interpreting transmitter adjustment instructions

 

开云体育

Hi the way to look at this is this:

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  1. Connect an 1-5 amp meter (DVM) in series with the rig, or use a power supply that shows current digitally.
  2. Set all the bias controls to zero
  3. Switch on and put into to TX (SSB)
  4. Note the current the rig draws.
  5. You can then adjust the driver ideal current for an additional 1A
  6. You can then adjust the driver VHF Final current for an additional 2A
  7. You can then adjust the driver UHF Final current for an additional 2.5A

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When you switch form HF to VHF to UHF, the bias current falls to zero on the non-use band

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MOSFET unlike bi-polar are nearer to class A (AB2) than Class AB1, or B (which is just conducting)

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KR

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Andrew G8UUG

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From: [email protected] <[email protected]> On Behalf Of HF via groups.io
Sent: 11 April 2025 06:17
To: [email protected]
Subject: [ic7000] Interpreting transmitter adjustment instructions

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Page 18 (marked 4-3) of the service manual explains adjustment of the final idle current.? It mentions connecting an ammeter that monitors the power supply current during the test and power meters to both antenna jacks.? Then it has this text:

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Rotate [DIAL] to set adjustment value to
1 A value from the driving current of "00"
value. Then push [F-4 (SET )].

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But there is no instructions for connecting an ammeter to the driver stage to measure or adjust its current.? Does "driving current" here actually mean the power supply current?? If yes, does this mean that one is supposed to record the power supply current when the adjustment value is at zero, then increase the adjustment setting until the power supply current is 1.0A more than it was at the zero setting?

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Cheers,

Halden VE7UTS
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