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 > > > > _______________________________________________ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
