Hello again, My radio is now built, working, calibrated (PA and IQ) as advised, tested. It seems however that voice compression effectively reduces final Tx power (instead of actually increasing it).

Hi Here My latest Modds for the Rx Mixer to avoid transmodulation with strong Broadcast radio signals and then reduce spurious signals on the spectrum. I am very happy with , i posted here just for di

Can we try an exttra roofing flter to limit local fm broadcasts not to interfere!! Rrgarrds Sarma vu3zmvv

Hello Guys! I'm wanna ask for help because my noise floor on the mcHF is pretty bad so far. For some reason one of the CBT3253 that switch the BPF went bad and I replaced both of them. I had checked w

Has anyone here had the opportunity to to compare these two rigs? Obvious differences are in the display size, gain control/s and built-in ATU, but what about hands-on? The mcHF has the benefit of bei

I have 2 HY28B displays, new. 2 I think work but not sure, and 2 3.2" displays, One new and the other I think works. $30 shipped. Pay pal is fine n5mf @ dfn . com -- Mark Flavin N5MF

Hi all I measured the outlet of the mixer alone with U1 + BPF Filter + U2 CBT3253C. There are practically no traces of IMD on the HF (IMD <-60db). ( HMC482ST82 Mmic not connected ) After connecting th

Should the the ACC connector (outer ring) be fully grounded on TX? Mine reads150 ohm when TX and that is to high to key my amplifier. Is this a menu thing? How do you guys go around this?

After weeks of field operation with my mcHF-with-autotuner, I was testing out a new antenna in my backyard when a few seconds into the third or fourth tuning cycle, the entire radio went dead. :-( I o

Hi everyone, Quite a while ago bought an mcHF kit including a case from m0nka. I am finally coming around to building it. I see that the instructions say that the RF shield needs to be manually modifi

When can a kit be ordered again that you can further assemble yourself. I see that the kit is now sold out. Ben PA3EPQ

Anyone have the picture and values for the bypass capacitors on the Version 7 board? Here is the pic I have but I forget the values of the caps. TNX Chuck

Hi everyone. I've been in trouble. With the radio off but with the power cord plugged in, to turn off the connected power bank I mistakenly switched the power bank from 12 volts to 24 and then back to

Hi, I have one magnetic VFO encoder for sale https://www.ebay.com/itm/144546546040 73! Alexey UT0UM -- 73! Alexey UT0UM -- www.mcHF.at

Hi, New owner here :) My mcHF is now built, working, time for calibration! I've went through most of the items, however one puzzles me - it's TX IQ calibration for "10mUp" band. As there's a separate

Hello All Please did some one has tryed this hardware modification as chowen below in target to improve linearity of the Tx-Mixer + the HF-preamplifier and then reduce IMD intermodulation splutter ??

First off, I should stress that my CW is still pretty weak, so it's hard to tell which of my problems are "the radio is doing something odd" and which are "the operator is a dope" - be gentle. :). Als

Just upgraded from old 2.7-version to latest 2.12. In the previous version in FreeDV-mode the radio is muted with no DV-signal present (of course). BUT in the latest version Analog SSB i still on in p

Dear mcHF friends! I would be very grateful if anyone please could give me some help to solve the issus I have! I have a mcHF with version 0.4 of both PCBs. I have done most of the sugegsted modificat

Edited on 14 June 2021: The trade became quite long and difficult for a newcomer to read. The right answer was immediately given by Chuck ( https://groups.io/g/mcHF/message/2316 ) : "You should have n