|Subject:||[Amps] yeah - it works !!|
|From:||Dan Sawyer <firstname.lastname@example.org>|
|Date:||Sat, 01 May 2004 18:42:28 -0700|
I recently posted "proud owner of a ... MRF154 amp" and got back a lot of helpful replies. Well I brought up the gate voltage first. The current draw was very low and there was no bias across the gate. I measured the 'gate' circuit, it was producing +5 volts. This would be consistent with a control line so I put a 100 ohm resister across it. The result was about 3 volts bias on the gate - so far so good.
Now we at the edge - I added about 26 volts to the drain and nothing seemed to happen. So it was time to connect everything up. It all worked. The frequency response was best at about 2 MHz and fell of slowly up to about 30 MHz.
The only anomaly is the gain seems to be dependent on the voltage applied to gate bias. The peak is with about 12.5 Volts in. Output drops
Here are a few questions:
1. From here is most likely safe to move the drain supply to 50V??
2. The gate control circuit seems to turn on with 100 ohms or less. Would a short reasonably burn up the control circuit??
3. I tried to look at the drain to see the output with a high impedance scope. No signal was visible. This is confusing.
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