Main and Sub VFO Audio, Dual Reception | Vertex Standard FT-1000MP

Operation

USING SUB VFO B

The Sub VFO works in a similar manner to the Main VFO, with which you should be familiar by now. The Sub VFO provides simple split (transmit/receive) fre- quency operation via the combination of the MAIN VFO’s RX and TX LED/Buttons and the SUB VFO’s RX and TX LED Buttons, and, more importantly, dual- channel reception via the [DUAL] button. We’ll get into those in a minute, but first let’s look at how to control the Sub VFO.

Frequency, mode, and Clarifier data can be trans- ferred from the Main VFO to the Sub VFO by pressing [AuB], but don’t forget that this will overwrite any set- tings that were in the Sub VFO previously. Also, the contents of the two VFOs can be swapped (with no loss of data) by pressing [AuB].

Most selections for the Main VFO can also be made for the Sub VFO directly, by pressing [SUB(CE)] right before another keypad key to select a band, or before a mode button to change the Sub VFO mode (displayed below the Sub VFO frequency). When you press the [SUB(CE)] key, the entire display for the Sub VFO will blink, after which you have five seconds to press an- other key. Note that to switch VFO registers in the Sub VFO, you need merely press the [SUB(CE)] key fol- lowed by the key for the same band that the Sub VFO is already on.

rTo set the Sub VFO (if it currently is on 7.000.0 MHz LSB) to the 14 MHz band,

press [SUB(CE)] ð [14(5)].

rTo change to USB, press [SUB(CE)] ð [USB].

rTo set the Sub VFO’s frequency to 14.225.00 MHz USB in one step,

press [SUB(CE)] ð [ENT] ð [1.8(1)] ð [10(4)] ð [3.5(2)] ð[3.5(2)] ð[14(5)] ð[USB] ð[ENT].

Unlike the Main VFO, with its triple-conversion re- ceiver, the Sub VFO receiver uses double-conversion circuitry with 47 MHz and 455 kHz intermediate fre- quencies. Filters are selected automatically in the sub receiver, according to the operating mode. A 6-kHz AM filter and 2.4-kHz SSB/CW filter come installed from the factory. For CW work, a third optional 500-Hz nar- row filter is also available from your dealer. After instal- lation, this filter pathway must be enabled via menu selection 5-8. During operation, you can select this filter by pressing [SUB(CE)] ð [NAR1] or [SUB(CE)] ð [NAR2].

Of course, you can tune the Sub VFO using its tun- ing knob, and use faster tuning steps by holding the [FAST] button (below the left side of the main tuning knob). You can use the large DOWN(q) and UP(p) keys (in both normal and 1-MHz fast steps) for the Sub VFO as well, if you just press the [SUB(CE)] key first.

About the only things you cannot do with the Sub VFO (that you can with the Main VFO), are store it directly into a memory, and set the Clarifier. For these functions you need to swap it with the Main VFO first

(push [Au B], then hold the [AuB] button for ½-sec-

ond (to store it in a memory) or set the Clarifier, and

then press [Au B] again to return the data to the re-

spective VFOs.

DUAL RECEPTION

Pressing the blue [DUAL] button activates the SUB VFO-B receiver. The “DUAL” indicator will appear at the left of the display, and the green “RX” LED above the SUB VFO-Btuning knob lights. Instead of press- ing the blue [DUAL] button, you also can simply press the green “RX” LED, as this actually is a combined switch/LED.

Dual receive operation opens up exciting operating possibilities for split operation, contesting, and chas- ing elusive DX stations. For split-frequency DX pile- ups the ability to listen to both “sides” of the pile-up allows very precise timing of your calls. For contest- ing, dual receive allows you to continue a “run” on your “main” frequency while keeping an ear on a DX “multi- plier” that might not be listening for your call area, for example.

The Main and Sub VFO share the same antenna and front-end bandpass filter, and so should be tuned fairly close to each other for maximum sensitivity (that is, within 500 kHz or so at low frequencies, or within several MHz at higher frequencies). Although you may be able to receive on, say, 21 and 28 MHz at the same time, you may find the SUB VFO-B receiver signal at- tenuated.

There are 12 BPF networks in the receiver front- end circuitry, each covering a particular segment of the transceiver’s full receive range. SUB VFO-B receiver specifications are only guaranteed while tuning within the same bandpass as the MAIN VFO-A.