Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Next revision 		Previous revision
562bfo [2007/03/26 02:09]
n5na created 		562bfo [2007/03/29 09:37]
n5na
Line 1: Line 1:
 ====== Omni V Tunable BFO Mod ====== ====== Omni V Tunable BFO Mod ======
-**From the Ten Tec Reflector September 24, 1997**+**From the Ten-Tec Reflector September 24, 1997**
  
-Mod: Provides a means of varying the bfo frequency on the CW and LSB modes.+**Mod:** Provides a means of varying the bfo frequency on the CW and LSB modes.
  
-History: The Omni V has no RIT. Offset tuning is accomplished by operating constantly in the split mode. This is cumbersome. Installing a real RIT control would be overly complex. This mod provides the next best thing.+**History:** The Omni V has no RIT. Offset tuning is accomplished by operating constantly in the split mode. This is cumbersome. Installing a real RIT control would be overly complex. This mod provides the next best thing.
  
-Application:​ Omni V+**Application:​** Omni V
  
-Likely Users: Good CW men who love the Omni V+**Likely Users:** Good CW men who love the Omni V
  
-Specs: Allows frequency of bfo oscillator to vary over a 600hz range.+**Specs:** Allows frequency of bfo oscillator to vary over a 600hz range.
  
-Purpose:+**Purpose:**
  
 1.  To allow changing the audible pitch of incoming cw signals without engaging the "​split"​ mode. 1.  To allow changing the audible pitch of incoming cw signals without engaging the "​split"​ mode.
 +
 2.  Allows the operator to change the bfo offset at will for a more comfortable pitch. 2.  Allows the operator to change the bfo offset at will for a more comfortable pitch.
 +
 3.  Increases convenience during NET operations allowing one to ( tune in) off-channel signals and quickly QSY to another frequency 3.  Increases convenience during NET operations allowing one to ( tune in) off-channel signals and quickly QSY to another frequency
 without pushing the split and a=b buttons. without pushing the split and a=b buttons.
  
-Parts Needed:+**Parts Needed:** 
 1ea. NTE612 Varactor 1ea. NTE612 Varactor
 +
 1ea. 68pf disk ceramic capacitor 1ea. 68pf disk ceramic capacitor
 +
 1ea. 12k 1/4 watt resistor 1ea. 12k 1/4 watt resistor
  
-Parts Cost: $2.50+**Parts Cost:** $2.50
  
-Test Equipment: Frequency counter.+**Test Equipment:** Frequency counter.
  
-Procedure:+**Procedure:**
  
 1.  Remove C3 from the transmit audio/bfo board. If you are careful and lucky, this cap can be crushed with pliers and the remaining lead used as a connecting point for the new cap. Otherwise, you will need to remove the board. The latter makes for a neater job 1.  Remove C3 from the transmit audio/bfo board. If you are careful and lucky, this cap can be crushed with pliers and the remaining lead used as a connecting point for the new cap. Otherwise, you will need to remove the board. The latter makes for a neater job
Line 55: Line 60:
 12. While you're at it, adjust C6, C7, C10 and C9 per instructions on page 6-57. 12. While you're at it, adjust C6, C7, C10 and C9 per instructions on page 6-57.
  
-Note: If the 250hz filter is used, the PBT may need readjusting when the bfo is varied over a wide range.+**Note:** If the 250hz filter is used, the PBT may need readjusting when the bfo is varied over a wide range.
  
 For those who like the notch function. The tone control or squelch could be used since they are all 10k pots. The regulated voltage source can be applied to the top of either pot and the bottom end grounded. The wiper can then be routed as previously outlined. For those who like the notch function. The tone control or squelch could be used since they are all 10k pots. The regulated voltage source can be applied to the top of either pot and the bottom end grounded. The wiper can then be routed as previously outlined.

Trace:

QR Code
QR Code 562bfo (generated for current page)