|Joined:||Sat, Apr 4th 1998, 00:00||Roles:||N/A||Moderates:||N/A|
|ALC voltage range for YAESU FL-2100B||Porschetony||on 22/8/12|
|Yes, but you need to start out with it turned down as low as it will go. Then follow the instructions in the FL2100 manual.|
|1/4 VS 1/2 WAVE VERTICALS||N2GVO||on 29/7/12|
|The issue is common mode current. Remember, RF MUST return to its source. In a dipole antenna, that is the opposite leg. In a vertical, that is the ground plane (typically radials). If the current flow between the elements is imbalanced, the imbalance flows on the outside of the coaxial feed as common mode.
At low power levels, there isn't too much worry, but there can be. At high power levels (>20 watts), all sorts of maladies can, and do, occur.
Half-wave, loaded verticals work fairly well, and long as they're not subject to heavy loading from near by structures (trees, buildings, even fences). This is the reason their owner's manuals state that they must be mounted free and clear. Mounted close to the ground, or near other structures, conducting or not, they're difficult to tune, if not impossible.
The bottom line truth is, it is very difficult to surpass the performance of a simple dipole, even one which is electrically shortened. You just have to decide how much effort you're willing to put into your antenna installation. While you're thinking about that issue, remember too, any antenna is the most important, single piece of hardware, you'll ever purchase!
|Need programming for HX240V||WD4PLB||on 23/7/12|
You'll need the serial programing cable. You can buy that on Ebay for about $30. You'll need the DOS based software, and that's out on the web if you look hard enough. Besides the need for a DOS OS, you'll need a serial port. It will not work with a serial to USB adapter.
This radio went out of production in 1997, if memory serves. Standard has long since declared it a legacy product with no support available.
|Antenna switch question||KF7SXD||on 20/7/12|
|You could use what is often referred to as a cross switch. MFJ sells one, advertised as an amplifier bypass switch. In one position it is A in to 1 out, and B in to 2 out. In the other position it is A in to 2 out, and B in to 1 out. Put a dummy load on the used out port, and you're in business. However.......
As Zack mentioned, unless the switch in question has very good port to port isolation (>60 dB), you run the risk of damaging the unused transceiver, even though a dummy load is essentially shorting it out. I haven't a clue how much isolation the MFJ has, and MFJ doesn't say either.
|cushcraft r8 antenna problems||Bmagill||on 12/7/12|
|No mercy needed. MFJ's warranty is solid! Again. Make sure you have the box attached correctly. It is very easy to get it wrong.|