it's PDF file https://groups.io/g/BITX20/files/uBitx%20anti%20pop%20on%20TXRX%20switch%20over/uBITX%20_Anti-POP_version%203_Apr_10_2018.pdf wayne 72

Wes Hayward, W7ZOI, also has an article on using dual J-FETs in cascode mode for AGC use. 73 Kees K5BCQ

I think I solved the audio pop problem on CW based on the VE1BWV muting circuit (see uBitx.net) Earlier I tried this muting circuit, which mutes the audio during transmit, but it also muted the

It can be done with 2 Jfets, 2 bipolar if the lower input impedance is useful, or 1 of each (HyCas). IF one wants to be retro a 12AT7! They all work. The two J-fets is really old and appear in ths

Since dual gate BF998 units are apparently older and either not stocked or obsolete, I would assume the BF2040 is acceptable to try (and inexpensive). 73 Kees K5BCQ

Also used by DL6WD Rudolf Fischer. See ARRL Single Sideband for the Radio Amateur 1970 p193 et seq. "An Engineer's Ham-Band Receiver" Used in the RF amplifier with 0-60dB manual RF gain

You can tell the BF998 is an older part because the datasheet identifies it as a "tetrode". https://www.mouser.com/datasheet/2/196/bf998series-59603.pdf Would be very cool to be able to say I have

Skip, The mic cable was shielded. I was using the electret that came with the ubitx, and the momentary switch in a custom 3d printed housing (no shielding in the housing) but the longest run of un

Ordered: Feb. 22, 2018 Shipped: Apr. 7, 2018 Received: April 11, 2018 (7 weeks) Board 0523/4 came with a Youwang UTC2822M audio amp chip. -Paul K9MV

Would this work, changing the matching circuits to the Ubitx IF freq? (Taken from Texas Instruments AN32 FET Applications)

Good work! I hope that a step by step procedure could be posted for those of us who are schematic/theory challenged. I can follow step by step instructions ala Heathkit/Elecraft but I totally suck

HI all. My apologies, I dont have a complete schematic. I am on holidays now for 2 weeks so should get to doing one up. But the gist is follow the original raduino. Then follow the BS170 PTT pop fix

Yes James I read one of your other post where you removed the electret element and the hum went away. Before I read that I was going to suggest that you measure from the element housing (metal part of

Bill The muting circuit, with photos, is on the uBitx.net site. I could probably send you photos of my addition. The schematic is only partially helpful because of the gaps. If you are interested,

What Ian is working on in his new V1.07 firmware: https://youtu.be/BlMm4yE4Xaw 73, John (VK2ETA)

Any chance you could take a picture of the agc part of that article and post it? I gave away both my copies of that book to the local library when I thought I wouldn't need them any longer! tim

Hi Howard, Please send me photos of your work. I have a pretty good idea of what to do but another perspective would help a lot! My email is nz0tham@.... 73, Bill NZ0T

I don't know why it wouldn't. I'm just guessing but I wonder just how important tuned circuits would be at 45Mhz? There are several other circuits that would lend themselves in this

I am having difficulty finding directions for using the ubitx memory manager v 1.01. Any help will be appreciated. thanks, Paul K0ZYV

When using a Baofeng mike, can you just slice off the small plug for the speaker mike and just go on your merry way? TNX George N2TMC