FW: [AMRadio] FW: next project!

[Jim Isbell]

How about a pair of 4-125A's using one as modulator the other as final 
and use a microwave oven transformer for plate power, keep everything in 
one case.

Brett Gazdzinski wrote:

>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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>>
>
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