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I am most interested in the era of the 76 and 77. 73 -Jim NU0C "Paul Christensen" <w9ac@...> wrote:

You are mainly interested in S21 logmag. You will want to do a calibration centered on 5.645 MHz with probably 30 KHz or so span. You can set your stimulus centered on 5.645 using Center/Span

In total, I have 63 of their ads saved that span a time from 1970 through about 2000. Paul, W9AC

Easy on that Brown Brothers key! :-) John K5MO

Thanks Paul. I've been meaning to look for some of those. My small Alpha is a 76. 73 -Jim NU0C "Paul Christensen" <w9ac@...> wrote:

I’ve been having trouble trying to figure out how to set up the NVNA to check filters. I’ve found nothing really online. Any suggestions? Those menus are a challenge to me. Steve Wedge, W1ES/4

FT8 is a continuous carrier mode. True that it is MFSK, but there is only ONE tone present at any given time. This has been explained many times by the developers and Joe Taylor himself in various

Thanks for the info Rob. I will add it to my notes. 73 -Jim NU0C "Rob Sherwood" <rob@...> wrote:

Here are a few ETO/Alpha ads on my Google Drive with the legendary brick on the key. Don't do this with today's solid-state amps.

Insertion loss can change a bit with the drive level which is more likely with CW bandwidths. An SSB filter loss should be under 4 dB at a -10 dBm level. A 250 Hz filter may have 10 dB insertion loss.

To get that kind of power out, I am sure the driver rig is beyond its pro limits , since FT8 is a accumulated pep mode, Most 100 watt pep should only be run at 1/2 power, or 50 watts out 73, Dudley

We'll try this again, without the fat figered ENTER key... Not particularly. I used the raw output of my NanoVNA-H and Midnight SNA. I would have to dig up what those values are. This does not answer

Jim, Any guidance as to maximum signal level for sweeping these Drake filters? Thanks, Jerry, N4JL

I heard it from somewhere and shared it with this group but I can't remember who told me. There is somebody in this group with the physics background who explained why it works. It has something to do

This might help.? Has anyone used this place? https://www.oldradioparts.net/controls.html 73 Steve WA8ZMC

I always wanted to know what they used as an exciter. Mike Bryce WB8VGE prosolar@... "The eye is always caught by the light, but shadows have more to say"

Oh yeah. Looking at my 77Sx I believe it. 73 -Jim NU0C "jerry-KF6VB" <jerry@...> wrote:

Many years ago I had one of the short-lived Butternut "butterfly" beams. When they say 1KW CW maximum they mean it. One day I hit it with close to 1300 Watts CW from my NCL-2000 and a doorknob

Wes, Comments inline below. "Wes Winkler via groups.io" <wewinkler@...> wrote: Yes. I have done it with several TR7 filters with both a NVNA and a Midnight SNA. They both agree closely

*** Remember the Alpha advertisement with the brick on the code key? - Jerry, KF6VB