Stacks
The most powerful stacks of all time!
Customers have begun sending in photos of their potent stacks of multi-monobanders. As they are scanned and prepared, they will be included. These stacks are unsurpassed in gain and flexibility. The basic combinations are:
Model |
Bands |
Boom Length | Notes |
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| C-3SS | 20-15-10 | 12' | Also used on 17 & 12 | |||
| C-3 | 20-15-10 | 18' | Also used on 17 & 12 | |||
| C-19XR | 20-15-10 | 19' | Single feedline | |||
| C-31XR | 20-15-10 | 31' | Single or multiple feedlines | |||
| C-49XR | 20-15-10 | 49' | Single or multiple feedlines | |||
| C-39XRN | 40-20-15-10 | 39' | 2el 40 (N elements), plus C-19XR | |||
| C-51XR | 40-20-15-10 | 51' | 2el 40, plus C-31XR | |||
| C-51XRN | 40-20-15-10 | 51' | 2el 40 (N elements), plus C-31XR | |||
VE1JF
One of the largest stacks is in Nova Scotia at the QTH of Jim Fisher, VE1JF. Jim uses a guyed, Trylon tower to support his array. His location is on a bluff overlooking the ocean, so the weather can be extremely challenging. The original antenna is a C-51XR and was alone on the tower until this year (2001). Jim's full stack required a larger model tower, so he changed the tower in early 2001. Jim also enhanced both of his C-51XR's to the C-51XRN, using the "N" elements on 40 meters for increased bandwidth (covering the entire band). This was done in the field after extensive modeling at Force 12 to not change the boom length or balance point and to minimize bracket location shifts. At the first opportunity this year with good weather, Jim completed the entire installation. The stack consists of a pair of C-51XRN's, with a C-31XR spaced in between them. The C-31XR and lower C-51XRN utilize TIC ring rotators and the top C-51XRN is turned with an OR-2800.
Initial testing on the array show the phasing is performing as expected on all bands. The first DX QSO was with a JA, without telling him the antenna was being switched. S-meter indicated an improvement of 10dB between the top antenna alone and the stack - exactly what one wants to hear when testing a new antenna! These are the newest photos, as of August 1st:
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WN9O
Another large stack is in Kokomo, Indiana at the QTH of Kevin McClure, WN9O. Kevin has one of the first C-51XR's delivered. It is stacked over a C-31XR using a TIC ring rotator and a lower C-3. The antenna above the C-51XR is an EF-180C rotatable dipole for 80/75 meters. The array has performed flawlessly since it first went up.
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