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Thanks Steve, I didn't have the article open at the time and had forgotten about the pot that Dallas had. It amounts to sort of the same thing - varying the DC bias on the gate - but keeps the

Something here just isn't right. Regardless of whether you are applying a bias voltage to the JFET gate or changing the resistors, the JFET drain current remains virtually unchanged. The values were

Hi Chris, The following are the IMD performance results I got using your 5 new fixed resistor bias values. To be able to measure the bipolar current, I put a 1 ohm resistor between emitter and supply

the Power circuit--I the I was just about to ask how the bias of my circuit was c

One additional comment on how Intercept Points are indicated (and measured). I measured and referenced the Intercept Points in the two circuits to the output of the device--thus "OIP3" means "Third

Hi Rob, I adjusted the bias voltage to the jfet, with the corresponding change in the circuit total current. A two-tone IMD test set was used, looking at the 2IMD level, and the bias was adjusted for

Steve, How were you adjusting the bias current in your tests? By changing the value of the J309, J310 source resistor? Rob wrote: and the performance. did the

I have just finished building and testing both the Lankford circuit and the Trask circuit on the bench, for gain/frequency response and IMD performance. The results are given below. Note that Trask's

As you increase the gain, there will be less feedback, however the IP2/IP3 will degrade as less power is sent to the J309 source to correct for distortion. There's sufficient open loop gain such that

Hi Chris, That's what I thought and makes more sense. I assume that the higher the gain, the less feedback and less IP2/IP3? Rob J309

Ooops! It should have said between the 2N2907 COLLECTOR and the J309 source. The output is then taken from the 2N2907 collector. Chris ,----------------------. High Performance Mixers and / What's all

Chris, Can you clarify this statement? It appears that this would be the same as connecting a resistor from Vcc to the J309 source? Rob Doing this will require a higher supply voltage so as to provide

I just clicked on the URL in your posting and it downloaded properly. Chris ,----------------------. High Performance Mixers and / What's all this \ Amplifiers for RF Communications / extinct

<3mensions@...> wrote: Got it now! Thanks Cor & Paul :)

Hmm I have a problem opening this URL.... Is there a possibility to place it somewhere else, or email it directly to me? Or maybe the files section? If others have the same prob I could place it

Most of the amplifiers used with active antennas have fairly common flaws, and the amplifiers found in these two URLs are no exception. The circuit from Electronic Design:

Thanks, This will make it a serious candidate for experiments. Regards, Cor Beijersbergen van Henegouwen Yes. That is how r2000slwer built mine. There is a power injector or diplexer at the receiver

If you have a link relevant to the group, please post it in the Links section. If you just put it in a message, it will get lost in the shuffle after a few days. The coverage of the list is pretty

Thanks for that info, much appreciated :) Gotcha =) I'm still looking for the availability for some of the parts of the wl1030 and for some I might need to get them per 10, so the wl1030 plan might

the diodes, that could