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The AGC board operates on two different signals in the radio. AGC attenuation level is determined by measuring the audio signal level after all of the filters that pick out only your signal of

Hello All, I have been working on a UBITX V5 and am installing both a BCI filter and the Kit-Projects AGC. According to what I have read regarding the BCI FILTER and the Kit-Projects AGC, both are

Stephan, Driving 1khz into C31 is not going to give much response because the amplifier at Q3 is operating at 12mhz, and the 0.1uF at C33 will mostly block the 1khz audio frequency. The signals

Yes, on the uBitx, K1-14 is shorted to ground for DC by T2 pins 1 and 6 by way of L1,L2,L3,L4. At DC, T2,L1,L2,L3,L4 are all just a few centimeters of magnet wire, and present very little resistance.

Already tried that a long time ago - didn't make much, if any difference on my Siglent SSA 3021X spectrum analyzer so not really worth the trouble IMO. W0EB

While replacing the four low pass filter relays with Axicom units, a thought occurred to mount the relays on the bottom side of the circuit board. The bottom side is mostly a ground plane. Wonder if

So I am at home again and the troubleshooting begins :-) Maybe thats's a stupid question, but should there be a DC short within the antenna line between the relais K1 (14) and ground in the signal

I would like to call attention to the work of members of the Elmira Radio Club in refining the EH antenna... Paul VE3PVB and Al VA3TET among others were leaders in the project, taking Ted Hart's work

Heh, hit me up privately (adrian.chadd@...) - I'll give you a radio for your club. :) -a (kk6vqk)

Thanks, will look at that in a bit.. appreciate the suggestion. -- 72 and God bless KD4EPG

We're a bunch of newbies, most still studying for the exam. We've got a budget of $100. Perhaps could raise a bit more. So a buit and tested kit would be a good option. km6tcd Sent: Thursday, June 06,

Hello! With the AGC mod from Don nd6t I have a lot of fun with my bitx40 again. Without this strong signals overdrive my RX path somewhere (in LM386?) that much that I had strong distortion with

Ravi Fantastic on your homebrew scratch build. Based upon all the clues, I wonder if there may be a missing connection at the crystal filter. Either try injecting a signal before and after it. If no

Where I stand on loops: Based on design work and in use.? Loop antennas are useful either in?the wide band receiving only type or tuned transmitting type.? They are not close to full size dipoles

Alan de G1FXB Jun 1 #69407 ( /g/BITX20/message/69407 ) I recall you done antenna R&D. Yes, I did for a commercial firm that was biased toward research and specialized designs. EH

A friend of mine reported very good results with one of the loop antennas sold by MFJ (40-6 coverage as I remember).? He liked it because of the noise problem - here it can be a huge issue (not

I knocked up a 3-turn loop, with an old soviet era vac-cap, total length was 10m of copper tube, and it covered 160m thru' 30m and did work very well, although the bandwidth was so skinny on topband,

ravi, which firmware version are you using? it might help to trace a signal. inject a 100mv signal and trace it with a scope on the rx path.. - f

If the blue bias pot is slightly skewed then one lead could be cut. Replace. Remove Q95 and check gate voltage as you vary the associated preset RV2. It should go from 0-5V. If not replace and set the

Ravi jee, Just use kd8cec , select the lcd type in ubitx.h, select ver5 on main file, just compile. Later pwer on Nd while calibrating change bfo to 1105550 and click ptt and save. Also power cycle.