> Just because its mil-spec freq response is +/- 1db is 100-3000~ > doesn't necessarily mean it is limited to that response. It simply means > that it is guaranteed to be +/- 1db over that range. Depending on the > manufacturer, it may actually have a much wider range. I have seen military items > rated at 300-3000~ that were actually more like 50-8000~. A good example > is the T-368. The stock audio is very restricted, but if the low level > audio is redone, the xmtr has good enough iron to sound near broadcast quality.
That's the exact point I was attempting to make... just because it's garunteed to be +/1 1db at whatever range of frequencies, doesn't mean it won't do better. How much better is a matter of measurment. It does however, Don, make me feel much better about using a T-368 modulation transformer in the 250TH modulator, with the reactor across the secondary. :-) That mod iron, as I've been told on the air, does allow for some fairly deep low frequency responses. My audio setup starts with a balanced-line output Sure SM-7 microphonium, into a balanced-line in/out 31-band graphic EQ, into a balanced-line input on the modified Bogen PA system, used as the speech- amp. After that, the audio is taken directly off of the plates of the 8417's into a 1:1 isolation transformer, of which hte secondary is used as a high-Z choke, while the audio goes to drive the bases of a pair of ECG164 Vertical output transistors, lashed up in an emitter follower configuration (thanks John/WA5BXO ref:http://www.qsl.net/wa5bxo/driver1.html). The emitter output lines directly drive the grids of the 250TH's. -- 73 = Best Regards, -Geoff/W5OMR(m5 Houston, TX)
