Table of Contents
Advertisement
5-2 FREQUENCY ADJUSTMENTS
1) Select an adjustment item using [↑]/[↓] on the PC's keyboard.
2) Set or modify the adjustment value as specifi ed using [←]/[→] on the PC's keyboard, then push [ENTER].
TRANSCEIVER'S
ADJUSTMENT
PLL LOCK
1
VOLTAGE
-Adjustment-
(RX)
2 • CH.
• Receiving
(TX)
3 • CH.
• Transmitting
PLL LOCK
1 • CH.
VOLTAGE
• Receiving
-Verify-
(RX)
(TX)
2 • CH.
• Transmitting
REFERENCE
1 • CH.
FREQUENCY
• Transmitting
CONDITION
• Connect an RF power meter to the
–
antenna connector.
: 1
• Select the item [RX LVA], then push
[ENTER].
: 1
• Select the item [TX LVA], then push
[ENTER].
: 2
• Click the [Reload (F5)] button to check
on the "I/O Check window" as illustrated
below.
: 2
: 3
• Loosely couple a frequency counter to the
antenna connector.
• I/O Check window
(The values shown above are example only.
Each transceiver has own values.)
OPERATION
Lock voltage
* * *
5 - 5
ADJUSTMENT
VALUE
ITEM
–
–
1.0 V
[RX LVA]
1.0 V
[TX LVA]
3.0–4.0 V
(Verify)
[LVIN]
(On the "I/O
Check window")
2.7–3.9 V
(Verify)
470.0000 MHz
[REF]
(±300 Hz)
Hide quick links:
Advertisement
Table of Contents
Need help?
Do you have a question about the IC-F4001 and is the answer not in the manual?
Questions and answers
ptt pressed but not tx
The Icom IC-F4001 may not be transmitting when the PTT is pressed due to several possible reasons:
1. Transmit Inhibit Function – Transmission is restricted if:
- The channel is muted (PMR operation only).
- The channel is busy.
- A signal with an unmatched (or matched) CTCSS or DTCS tone is received.
- The selected channel is a "receive only" channel.
2. Time-Out Timer – If the transceiver has been transmitting continuously beyond the pre-programmed time limit, the time-out timer activates and stops further transmission.
3. Penalty Timer – After the time-out timer activates, the penalty timer may further inhibit transmission for a set period.
4. Power Supply Issues – If the transceiver is connected to a power supply with incorrect voltage or reversed polarity, it may not function properly.
5. Antenna Damage – If an RF signal stronger than 20 dBm (100 mW) was applied to the antenna connector, the transceiver’s front-end could be damaged, affecting transmission.
Checking these factors can help identify and resolve the issue.
This answer is automatically generated
Q73 trasistor does not work when PTT pressed but software is ok