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
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