NEScaf with the DC40

From today's neqrp mailing list...

Some Nescaf comments picked from the DC-40 list server...
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It seems like the receiver bandwidth is pretty wide.... I was hearing 10 QSO's going on at the same time. Maybe this will motivate me to build the NESCAF filter. I guess since there is no Xtal filter, it should be fairly wide. Dennis
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Dennis,
There is a 600 Hz audio filter built-in. Unless the signals are really strong you shouldn't hear much outside of that bandwidth. Otherwise, the front end is quite wide with only a simple tuned circuit. If you have a way to generate a low level tunable signal see if you can verify that the 600 Hz filter is working. You should hear a definite peak. The NEScaf is a good idea too. Chuck
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Yes the NESCAF filter works great with any of the qrp kits out there. I even use it on some QRO equip. Have made many contacts with the DC40 both stock and with the filter. I bought a few more xtals (different freq.) so I could move around. You can use a switch for the xtals or make a xtal socket from a IC socket and put it on the front panel of your enclosure. 73 George
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Yes is is a bit wide but that is the way of direct conversion receivers. I built the NESCAF and that really narrows it down. I can use the filter to select signals to listen to. R.G
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jim / W1FMR