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The resistors are for the Morse key. Do not discard them. See here : https://ubitx.net/wiring-up-a-paddle-and-straight-key/ 73, ... Martin VE3OAT

Perhaps this article would be of some interest (Ham Radio Dec 1973)

Just received the V5.1 - works OK , Transmits, receives - But when I push the push button on the encoder? I can not get to setup. The button seems to not work, I did measure continuity and it closed

okay got it, so it removes some of the lower boomieness of the audio spectrum since it wouldn’t be heard much anyway and allow more of the mid and highs to get through. my first impression was a

A mazing what you can find in the forum archives with a little digging. The audio oscillator thing on the Collins KWM-2 only sorta worked slick, though I don't personally have any objections if you

Primarily it does block DC, however it attenuates somewhat more the lower frequencies (as 300hz) than the higher (3khz).

Evan, IIRC this is how the old Collins KWM-2 used to do CW. Injection of an audio tone. Again, IIRC that's how you did the spot function on cw, turn on the audio osc and zero beat it with the received

So it’s not dc blocking but a audio filter? Joe Kd2nfc

0.1uF at 300hz has a reactance around 5000ohm, at 3Khz 500ohm, so it acts as a sort of audio high pass filter. If the cap has a higher capacitance the audio response is flatter.

Filters... Part of the problem with using filters, or additional filters, is that some of the undesired signals are tunable. They are not always on the same frequency, depending on where the VFO

A bandpass filter that gives flat response across all of 80m (let alone 80m+60m both)? would be more difficult to implement than a low pass filter. Though a bandpass filter if done well could be

if its the common 100prr-6 (6 terminals on the back): the A and B termianls are transistors to ground and are used. Ground is ground (0V) termial Black and brown to the A and B terminals? (reverse if

Oliver, Does your rotary encoder put out 5v pulses on an A and a B channel when you spin the dial? If yours is like the industrial service rotary encoder I plan to install and puts out 5-volt pulses

Anyone happen to have a version 3 hmi for 3.5"? Thx.

Awesome, it didn’t hit me at first. I just grabbed two off eBay for $11 for both. I have parts I was going to use on interfaces, transformers, optocouplers, the easydigi has all you need. I’ve

Well, where are the harmonics showing up? :) -adrian wrote:

So, perhaps a dumb question or maybe two .., but "Why the continued instance on using low-pass filters ...Wouldn't some band-pass filters make more sense?? Jim

Joe Puma, yes that is most likely the purpose. Been there, done that, learned a thing.

As I said in post 66008: On Mon, Mar 4, 2019 at 12:03 PM, ajparent1/KB1GMX wrote:

Allison, Are you referring to my suggestion of unbalancing the D3,D4 mixer,? CLK2=VFO, CLK1=45mhz, CLK0=dead?? Given the 45mhz crystal filter, there should then be only 45mhz energy present going