|Joined:||Sat, Apr 4th 1998, 00:00||Roles:||N/A||Moderates:||N/A|
|Antenna Modeling for Beginners||Feb 8th 2013, 18:19||3||1,483||on 14/2/13|
|Roller Inductor Tuner||Dec 20th 2011, 19:26||1||1,376||on 20/12/11|
|Using Ladder Line||Jul 27th 2011, 19:43||3||2,357||on 29/7/11|
|HW101 Xmit set-up||KD0ZGW||4 days, 12 hours ago|
|I assume you are keying the transmitter at step 7?
|SWR and metal roof||KO0Y||1 week, 5 days ago|
|In the two-way radio world what you describe is a classic case of water in the feedline. The fact that the SWR is low between the antenna and the feedline but high at the radio end would indicate a coax problem or a bad connector at the antenna end. If the metal roof or mast was a problem then the SWR would have been bad when measured at the antenna. Many times water in the coax is hard to detect unless you cut off a a few feet and examine the center connector.
|Stranded Wire for Grounding||KG8GC||3 weeks, 3 days ago|
|Each piece of equipment should connected to a ground bus. Either solid or stranded jacketed wire is acceptable. The ground bus is connected to the ground rod. Stranded or solid is acceptable. I wouldn't use anything smaller than #12. #6 is commonly used but the bus to the ground rod should be #6 or larger. Some installations use flat strips of copper to reduce the inductance of wire. Connections to the ground rod should be made using an exothermic method if the connections are buried. Standard mechanical connections can be used if above ground. Sections 800, 810, and 820 of the National Electrical code and Motorola's R-56 manual can provide you with additional information. QST had several recent articles on equipment grounding methods.
|2M at 50watts setting off smoke detectors||Monzi||on 24/2/15|
|What are you using as a "ground plane" for the magnetic mount antenna?
|Cushcraft R8 SWR Problem||KI3T||on 21/10/14|
|You say the connector spins so I would look closely to see if the wires going to the connector are broken or shorted. The fact that it spins can't be a good thing. A spike in SWR could be an indication of an intermittent or shorted connection. That loose connector would be my first choice.