On Sat, 8 Oct 2011 13:53:21 -0700 (PDT), Neil M Califano wrote: >Sorry to interrupt, but does the R7 aux board use the R4 crystals or the SPR4 >crystals?
Neither. From the AUX-7 manual: The AUX7 is a plug-in unit which allows the user to program up to 8 auxiliary 500 kHz frequency ranges for instant selection from the front panel of a TR7 or R7. In addition, a crystal socket is provided for each of the eight auxiliary ranges to allow fixed frequency receive and/or transmit (in the case of a TR7) operation within a selected range. Note that each range module socket has a corresponding crystal socket. To operate on a fixed receive and/or transmit (in the case of a TR7) frequency within a selected range, the proper crystal must be installed in the socket corresponding to the appropriate range module. Use the following formula to determine the crystal frequency: Crystal Freq. (kHz) = 5050.0 kHz + Desired Carrier Frequency (kHz) - Lowest Range Frequency (kHz). For example, suppose it is desired to operate on a fixed carrier frequency of 4358.6 kHz. Referring to figure 1, this frequency falls in the 4.0-4.5 MHz range, so a range module must be programmed by clipping pins 2, 3, 4, 9, 11, 12, and 14. This module should be installed in the desired channel location on the AUX7. Channel crystal carrier frequency is then calculated as follows: 5050.0 kHz + 4358.6 kHz - 4000.0 kHz = 5408.6 kHz Thus, a 5408.6 kHz crystal is required for fixed operation on 4358.6 kHz, along with the appropriate range module. Note that the fixed crystals will always fall in the range 5050.0 kHz to 5550 kHz. When ordering a fixed channel crystal, always specify the following information: 1. Crystal frequency in kHz. 2. Frequency tolerance + .003% or better. 3. Parallel resonant, 32 pf load. 4. Series resistance 35 ohms, maximum. 5. HC-25/U Holder. Crystals of this type are available from several manufacturers, or can be obtained on a special order basis from the R. L. Drake Company. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist