Table of Contents
Advertisement
Antenna Tuner Memory System
The FC-30, working in concert with the FT-857, can store impedance matching data in its micro-computer memory, so as
to provide instant adjustment as you transmit in different areas of a particular band. A total of 100 memories are provided:
11 of these are "general" memories apportioned one per band, while the remaining 89 are allocated for specific frequency
data within the various bands, with the capability to resolve new tuning data every 10 kHz. A few guidelines should be
noted regarding the FC-30's memory system:
Tuning data is stored when you make an active effort to store it by pressing and holding in the [A](TUNE) key for one
second. Although the tuner will automatically activate itself if it encounters more than 1.5:1 SWR, this memory will not
be stored unless you have pressed the [A](TUNE) key for one second. This allows you to store your favorite operating
frequency areas into tuner memory without tying up memory space with matching data on seldom-used frequencies.
If the FC-30 cannot resolve a satisfactory match because the SWR is above 3:1 (2:1 on the 50 MHz band), the tuning
process will stop, and no memory data will be stored. However, you may wish to move frequency a few kHz, then press
the [A](TUNE) key again for one second, as slight changes in the reactance may allow a match to be obtained. Then go
back to the original frequency and try again.
Another technique which may allow matching in some situations is to add a few feet or meters of coaxial cable on the
"antenna side" of the FC-30. This will change the impedance transformation taking place in the coaxial cable, possibly
moving the impedance presented to the FC-30 into an acceptable range. Note that this is not changing the actual antenna
SWR, but only the impedance "seen" by the FC-30's matching circuits.
If your antenna system presents an SWR of less than 1.5:1, you may wish to turn off the antenna tuner, as full transmitter
power will be delivered to the antenna system without intervention by the FC-30.
If the impedance encountered by the FC-30 exceeds 3:1, and the "HI SWR" icon is illuminated, the microprocessor will
not retain the tuning data for that frequency, as the FC-30 presumes that you will want to adjust or repair your antenna
system so as to correct the high SWR condition.
The "Quick Memory" Bank provides one-touch access to frequencies you want to store and recall in a hurry. You may
store a "QMB" channel into a "regular" memory later, if you like; use of the "regular" memories will be described later.
QMB Channel Storage
1. Tune in the desired frequency and set the operating mode and bandwidth. If this is an FM channel, set
up any required CTCSS/DCS and repeater shift configurations.
2. Press and hold in the V/M key until a double "beep" is heard. The second beep provides audible confirmation that the
data has been stored into the QMB memory.
Memory Operation
QMB (Quick Memory Bank) Channels
46
FCC ID: K66FT-857
Operating Manual
Vertex Standard Co., Ltd.
Advertisement
Table of Contents
