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I was thinking whether a MMIC up to 10dbm and an RD06HHF as driver like in the 10w qrp-pa-2008 might make sense

MRM,? Roger that.? Pete has been doing it for a while and differing ways.? Experimenter he is. We talk/write from time to time. Multi-band is not terribly hard but requires attention and filtering

Yes, as a matter of fact I have looked at the schematic.

Tom,? Have you ever even looked at the schematic or the web site??? That called bi-directional.? ?Thats the general? ways its done. The Plessy is exactly the same only one is upside down for fewer

Hi Terry, I quickly tried the modifications to the sketch as I suggested earlier today, and they seem to work OK. I tested this on my own BitX40 and I could tune through the entire 80m band. Also the

Allison, I know that in general MMICs (Mav, Ina, Era, Gali whatever) are eager of drawing current. If I understand Warren, he wants to change the first one or two 2n3904 in the chain just to clean the

Are the amplifiers used in the uBITX actually bidirectional? They just look like two independent amplifiers pointed in opposite directions and independently switched on so they don't create a big

Single band radio. Easy to make work. Sent: Saturday, September 15, 2018 2:33 PM To: [email protected] Subject: [BITX20] #DIFX_Transceiver DIFX Transceiver. Does it compliment or compete with BITX. The

Warren and Allison and others, excellent work! This is great teamwork! Gordon

Dr. Lees 3.5 is actually a 2.8 compiled for 3.5 ie it will only fill up 3/4's of the screen in the upper left corner. The only 3.5 screen that is a true 3.5 that I know of is Rich Neese's.??

ITs a mix of bitx and the plessy BIDI from EMRFD. I've used the plessy Bidi and its two transistors and works well at 9-17db (depends on how you bypass the emitters) included is a picture of page 6.61

Hi Allison, I believe I've followed most of that thread. Assuming the BITX40 would also have issues at 10M, if it was driving another PA, in this case the uBITX Push-Pull PA, there may still be enough

Hi Allison, Good information on the IRF510 still needing high?quiescent current even if it is run at substantially lower power levels. But I do see the transistors you list above are mosfets rather

I'd also point out that the ubitx *as is* can easily do 7W on 40M I've seen more. That not the problem its what would the power chain for bitx40 do at 20M or 10M? Based on prior work, badly.? IT was

Tom, Understood but the heavy mosfet device needs higher operating current to get over the high input and output C.??For the driver its a maybe, but you need to heatsink it as its going to run at

Terry, while looking at it again, I realised that you'd also need to change lines 93 and 94. These are the initial frequencies of VFO A and B. I suggest to set these to a frequency somewhere in the

Marty - I seem to be having a problem with the ubitx_35.tft file for v1.1 seems it is producing an image for a smaller screen size. I think things have got mixed up. but I tossed my earlier version.

On Sat, Sep 15, 2018 at 10:34 AM, Warren Allgyer wrote: I don't have a lot of experience in this but my gut tells me pushing interstage gains to the 1 dB compression point is too much. When I did that

The MCL ERA-3SM draws 35 ma at 3.3 volts. It will be deployed with an onboard 3.3 volt regulator. The amplifier at Q20-22 that the MMIC will replace draws 34.7 ma. The layout is planned to be

Hi Terry The scan mode's lower and upper frequency limits are hard coded at lines 71 and 72. You could modify these values as well for 80m band. (Note that these values are kHz) So? for example you