What would you build/want as a 40 meter hi fi AM transceiver?
I want to limit the power to the 200 watt and under class, but
can put the high voltage power supply in a separate cabinet/rack, and
sit the transceiver on the operating desk, to save space and weight,
or, run one 4d32 at 100 watts with everything inside one box.
With a separate power supply, I could likely go to 200 watts
out of 2 4D32 tubes, or something different?
It can be simple, frequency select switch, rf gain, S meter, mic
gain, plate tune and load, rit,xit?, bass and treble audio EQ.
I will likely put many meters on it, for grid drive, plate voltage,
mod current, negative cycle loading , etc., can be a multi meter, or
separate meters (I like meters).
Or I could build a regular receiver with regular tuning, and leave the
trans xtal controlled, digital display receive frequency readout.
I can include 2 bandwidth choices, say 5.5 and 4 KHz on the receive filters.
What would YOU want in a 40 meter transceiver for AM?
Brett
N2DTS
Hello all AM,ers.
The 2nd home brew receiver seems done, and now the first one
needs some work.
I made a change to the antenna input circuit, increasing the gain
(reducing the loss) and now strong signals slightly overload the AGC
circuit.
Both receivers get better and better over time, as I try slight
changes to various circuits.
During the construction of the 2nd receiver, my nice heathkit
S meter hit
the floor and broke the cover, so I need a new cover, off any
heath meter
like the sb series have, anyone got an old one they want to
sell/trade?
I have a bid in on ebay for an old rusted sb receiver, good for parts
and the meter cover, but wont pay a lot for a rusty piece of
equipment.
Since the shack is cleaned up
(did look like a bomb went off in it during construction), I am
ready to start on the next project, a homebrew transceiver
for 40 meters.
I cant think of any good way to use one vfo to do both the receive
and transmit, so I may make the transmitter xtal controlled, say have
7280, 7285, 7290, and 7295Khz xtals with a switch.
You CAN move xtals with a cap, maybe I will try/include that.
No tuning for the drive stages since the frequency will be somewhat
fixed, reduces complexity and aids ease of operation.
The receiver will not need a preselect type adjustment.
Output tubes may be a pair of 4D32 tubes, since I have a mess
of those,
basically two 6146 tubes in one package...
Pair of KT88/KT90 tubes in AB1 as modulators?
Triodes take too much drive power, and I cant think of
anything else for AB1 mod tubes to give 150/200 watts of audio out.
Plate voltage on the transmitter will be about 750 to 800 volts,
I have some good transformers for that.
I have a nice big chassis, tube sockets, front panel, meters,
and some nice coil stock to make the PI net coil.
I should have a good plate and loading cap for the transmitter.
Anyone got any good ideas for the vfo problem?
Any other mod tube choices?
Maybe I could get xtals made for the receiver LO, and just have
the thing like a CB set, xtal control!
Sure would be stable and easy to build a xtal LO, with a little
cap on the xtal for RIT!
Should I use the station audio like I do for the rest
of the homebrew rigs, or build in its own audio amp stuff?
With the station audio, I have line in and out, mike EQ,
compression, and a good microphone.
Or I could use the D104 mike like I do on the 32V3,s, and add
some homebrew EQ to the front panel.
I am having fun already!
Brett
N2DTS
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