So my first AMT-3000 is at my house.
But my second AMT-3000 is with
somebody else quite some distance
from me. I believe both instruction
manuals are in that far away place,
also. Communications with my friend
"öut there" is difficult, because of his gigantic
work schedule.
So... Can one of you guys give me the
frequency switch settings for putting the
AMT-3000 on 620 kHz?
No hurry.
Bruce, Mon. Stn., CT
S4.. 1 thru 8..
off-on-off-off-off-off-on-on
ftp://pd5dp.no-ip.org/Upload/Manuals/S/SSTRAN/am%20qrp%20kit%20manual%20and%20schematic%20part%2015%20arrl%20ham%20radio.pdf
Thank you 12vman! I do appreciate it.
Bruce, Mon. Stn., CT
Usually it's been on the high end of the
AM BCB, as you guys know.
This is just an experiment. I'm going to
rig the AMT-3000 for carrier current.
This should be very very easy. I intend to
go into after the final transistor blocking
cap and put in another RF tuning network
that is different from what is there now.
Then I will make the appropriate isolation
network and feed the neutral.
It's just an experiment. A long term thing
to look forward to as we move and deal with
a bunch of other stuff.
I've had a real lot of "life stuff," and then every
once in a while there is an unexpected break
from it. So I came HERE, which is one of my
favorite places.
One more thing I thought I'd mention. There
have been some folks who have talked about
the AMT-3000 feeding a 1 watt linear amp for
carrier current. I'm not sure, but I don't think
linear amps are very efficient. Won't you only
get about 300 mW out?
If I get 30 mW into the AC line, that's only a
10 dB difference, if I'm right about all of this.
It doesn't matter anyway. It's just an experiment.
Very best wishes to all of you, my friends.
Bruce, Dazed and Confused
Do this experiment.
If we discover a way of using a AMT3000 for carrier current we will open new opportinty.
Linear amplifiers might be something for the future, as they could be designed for more than 300mW, but starting at the lowest level makes good sense.
Bruce is a Part 15 man who can't be stopped.
What is the RF output impedance of the Ramsey Linear Amp?
I just scoured their website looking for the info but couldn't find it.
Carrier current (CC) couplers require 50-ohm signals.
This amp could be the key for small-scale CC experimenting.
Anyway, as I hear it - Ramsey shut
down a bunch of their blogs, and that
sort of thing. I don't know why.
Bruce
You're right Bruce, and I think they listed manuals for download which seems to be unavailable.
Hope everybody at Ramsey is o.k.
50 ohms
They are fine.
the LPA-1 has a bad habbit of blowing the rf semiconductor under any kind of (even slight) mismatch. they are not really suitable for carrier current.
Is there a schematic for the LPA-1 floating around?
If we could see it, we could talk about ways of beefing it up, maybe a more stable output and a few extra watts?
Strange experience with the LPA1 PDF link.
I told it where to download, which it did.
But when I tried opening it in Firefox the original window popped up asking me where to download it or which browser to use to open it.
Using every approach, it always sent me in a circle.
Dizzy and staggering.