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DW-Manual-Sigma-280 Magnum-001 FORCE 12 SIGMA-280Magnum Assembly Instructions Page 10 of 32
_____a)
Slide both covers over the coils.
_____b)
Slide the end caps over both of the covers, being sure not to disturb the coil
spacing.
_____c)
If the cover drain holes were not drilled earlier, drill four (4) drain holes in a
straight line in what will be the bottom of the coil covers. Use a 1/8” or 3/16”
drill bit.
_____d)
Rotate the drain holes so that they are down.
_____e)
Use a good quality silicone sealant (RTV) and run a bead along the caps in
two (2) places:
_____e1.
Around the hole where the element goes through each cap
_____e2.
Around each cap where the cover enters the cap.
_____f)
The caps and covers can be painted if desired.
_____24)
The driver is tuned next.
_____25)
Be sure the relay boxes on both elements are operating in tandem.
_____26)
Using the same basic procedure as on the reflector, tune the driver.
_____27)
Attach the actual balun, feed line and matching hairpin to the driver feed point on the relay
box.
_____a)
Set the initial spacing on the hairpin coil about ¾” between turns.
_____28)
Energize the CW/Phone relays for LOW PHONE.
_____29)
Tune the coils on the driver for a frequency of 3.790-3.795 and secure the far ends as before,
then secure the coil covers.
_____30)
Adjust the hairpin match for the lowest VSWR.
_____31)
Open the CW/Phone relay and adjust the coils on the relay for the operating frequency (i.e.
3505).
_____a)
Secure the cover on the relay box.
_____32)
Secure the coils in position, if not done so already.
_____a)
Be sure the U-bolt is tight and the coil is in position for proper tuning.
_____b)
Use a ¼” drill and drill through the tip end of the coil (flattened end) and
through the element.
_____c)
Use a ¼ - 20 bolt and ny-loc to secure the coil.
_____33)
Secure the covers.
_____a)
Slide both covers over the coils.
_____b)
Slide the end caps over both of the covers, being sure not to disturb the coil
spacing.
_____c)
If the cover drain holes were not drilled earlier, drill four (4) drain holes in a
straight line in what will be the bottom of the coil covers. Use a 1/8” or 3/16”
drill bit.
_____d)
Rotate the drain holes so that they are down.
Содержание Sigma-280 Magnum
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