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Thursday, 06 May 2010 |
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USING THE K7DYY SUPERSENIOR |
The MICROPHONE CONNECTOR pin assignments are the same as for the K7DYY Senior transmitter, although the level will need to be reset.
- Pin 1 is ground
- Pin 2 is audio (600 ohms at 0 dbm nominal)
- Pin 3 is +8 Vdc to power the audio processor
- Pin 4 is push to talk, which is activated by a switch closure to ground
The MUTE/PTT connector on the rear panel has single pole douoble throw relay contacts for receiver muting and another PTT connection.
- Pin 1 is ground
- Pin 2 is PTT
- Pin 3 is normally closed mute contact
- Pin 4 is the pole
- Pin 5 is the normally open contact
The mute relay contacts are rated for 120 V at 1 A maximum.
The
SuperSenior has peak limiting at about 1500 watts PEP. This is provided
to protect the transmitter and should not be reached under normal use.
It is expected that the external audio source will provide suitable
compression or limiting which should be set below the transmitters
limiting threshold. Otherwise, distortion and splatter can result,
similar to negative overmodulation.
The transmitter has wide
audio bandwidth, in excess of 10 khz. It is essential that the external
audio source provide the proper overall audio bandwidth limits.
The SWR protection display HIGH SWR and will latch the transmitter off. It can be reset by cycling AC power.
The
carrier power should not be set above 400 watts. Because the peak power
cannot exceed 1,500 watts, the carrier would not be set above 375
watts for 100% modulation.
Take care not to block the airflow into the fans or out of the back of the transmitter.
The FREQ
switch sets the operating frequency from 1805 khz to 1995 khz and 3605
khz to 3995 khz in 5 khz steps. Band change occurs automatically as the
frequency is increased or decreased beyond the band edge. Frequency can
only be changed in receive mode.
The SPOT switch provides a signal that can be heard in the receiver but not transmitted. When the SPOT and XMIT switches are both on, approximately 80 watts are provided for tune up purposes. |
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