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The IC-R8500 has 2 types of squelch, noise squelch 
and S-meter squelch.

Noise  squelch:

  Only  acts  on  noise;  has  good  sen-

sitivity. It can be adjusted for reception of weak sig-
nals.  Strong  signals  exceeding  a  certain  level  will 
always cause the squelch to open.

S-meter  squelch:

  S-meter  squelch  does  not  open 

for weak signals but can be adjusted to open for sig-
nals over a wide range of strengths. Once you have 
selected a threshold point in a range, the IC-R8500 
will open for all signals above this point.
To adjust the squelch, rotate [SQUELCH].

•  Clockwise  rotation  closes  the  squelch  (sets  the  thresh-

old  point  higher);  counterclockwise  rotation  opens  the 
squelch (for reception of weak signals).

FM  signals  have  a  wide  bandwidth  which  makes 
them  easy  to  receive.  However,  you  may  be  tuned 
off-center resulting in audio distortion. The IC-R8500’
s off-center indicators appear in such cases, making 
it easy to fine tune to the center of the frequency.

AFC stands for automatic frequency control. The AFC 
circuit automatically compensates the tuning when a 
receive frequency drifts or goes off frequency.
When  one  of  the  off-center  indicators  appears,  the 
IC-R8500  can  adjust  the  receive  frequency  auto-
matically—when the AFC function is turned ON and 
an  off-center  frequency  is  received,  the  frequency 
in  the  display  automatically  changes  to  reflect  the 
center of the signal.

14

4

RECEIVE FUNCTIONS

 Squelch function

 Functions for FM

D

 Center indicator

S-meter squelch
threshold

Noise squelch
threshold (not
available in SSB,
CW, WFM and
AM narrow modes)

• Signals below the 

S-meter   level 
are muted.

When [SQUELCH] is
rotated past center,
the S-meter shows
the signal strength
needed to open the 
squelch.

SIGNAL

S

1 3 5 7 9 +20dB +60dB

RECV

One of these indicators appears when the received 
signal is off-center.

RECV

When one of these indicators appears, the 
displayed frequency is automatically moved to the 
center frequency.

AFC

D

 AFC

The 

IF  shift

  function  electronically  changes  the 

center  of  the  IF  (intermediate  frequency)  passband 
frequency  to  reject  interference.  The  IF  shift  is  not 
available in FM and AM modes.

q

  Adjust the [SHIFT] control for a minimum interfer-

ence signal level.

  •  The audio tone may be changed while the IF shift is in 

use.

w

  Set  the  shift  control  to  its  center  position  when 

there is no interference.

 Functions for SSB/CW

D

 IF shift

Shifts low

Center

Shifts high

IF SHIFT

APF

IF SHIFT

APF

IF SHIFT

APF

Summary of Contents for iC- r8500

Page 1: ...iC r8500 COMMUNICATIONS RECEIVER INSTRUCTION MANUAL...

Page 2: ...EVER use non rated fuses Non rated fuses could cause a fire or ruin the receiver RWARNING NEVER let metal wire or other objects touch any internal part or connectors on the rear panel of the receiver...

Page 3: ...lection 17 Channel selection 18 Programming 19 Copy and paste memory editing 19 Clearing 19 Channel bank names 20 Assigning channels numbers 21 6 SCANS 23 28 Operation 23 Mode select function 25 Speci...

Page 4: ...blanker function or automatic frequency control function The noise blanker is used for removing pulse type noise when SSB CW or AM mode is selected p 15 The automatic frequency control tunes the disp...

Page 5: ...etection during scan is available Refer to the REC SPCH item on p 31 for details Push for 1 sec to activate the lock function p 12 Push for 1 sec again to cancel the lock function The lock function ac...

Page 6: ...time is assigned this control adjusts the scan delay time scan pausing interval during sig nal reception This setting is effective when is selected for the scan resume condition When scan speed is ass...

Page 7: ...lect a scan resume con dition OFF is underscored scan pauses on a signal until it disappears then resumes 3 sec after that DLY is underscored scan resumes according to the DELAY SPEED control setting...

Page 8: ...AC adapter Connects to a 13 8 V DC power source using the supplied DC cable when the AC adapter is not connected y EXTERNAL SPEAKER JACK Connects an 8 external speaker When an external speaker is conn...

Page 9: ...rogrammed into a memory or scan group 2 SELECT CHANNEL INDICATOR p 23 Appears when the selected memory channel is set as a select channel 3 BANK NUMBER INDICATOR p 17 Shows the selected memory bank nu...

Page 10: ...8500 has an adjustable stand for desktop use Set the stand to one of two angles de pending on your operating conditions D Optional bracket and carrying handle Mounting bracket An optional mounting bra...

Page 11: ...Computer control p 10 External speaker p 43 High speed data connection p 16 0 1 30 MHz coverage 0 1 30 MHz coverage 30 MHz 2 GHz coverage The optional AH 7000 is available for 25 MHz to 1300 MHz cove...

Page 12: ...gauge cable to a water pipe or long earth sunk copper rod Make the distance between the GND terminal and ground as short as possible RWARNING NEVER use a gas pipe or electri cal conduit pipe for groun...

Page 13: ...roviding control of multiple functions such as instant frequency name programming using appropriate software See pgs 35 36 for the control command table Personal computer IC R8500 RS 232C cable 13 25...

Page 14: ...ter the MHz digits for the desired frequency If a key is mistakenly pushed push CE and start again from the beginning When entering the same MHz digits as the displayed frequency this step can be skip...

Page 15: ...lue The programmable tuning step is automatically selected as the active tuning step Lock function The lock function electronically locks the indicated frequency from accidentally being changed Push S...

Page 16: ...ODE BANDWIDTH INDICATION DESCRIPTION FM 12 kHz 6 dB Amateur bands citizens band utility communications marine bands etc FM narrow can only receive narrow FM signals normal FM can receive both normal a...

Page 17: ...f the off center indicators appears the IC R8500 can adjust the receive frequency auto matically when the AFC function is turned ON and an off center frequency is received the frequency in the display...

Page 18: ...e with the IF shift func tion the audio characteristics of the received signal are often changed Use the BFO adjustment func tion to adjust the audio quality of the received signal to that desired q P...

Page 19: ...y as below r Set the connected terminal unit to the appropri ate settings Refer to the terminal unit s instructions Rear panel TU or TNC to AGC RCA plug Personal computer Audio IN or Detector IN For h...

Page 20: ...s memory channels BANK INITIAL CONTENTS USAGE 40 memories 20 banks For normal use Frequency mode tuning step name and ATT information can be programmed The number of channels in each bank is user ass...

Page 21: ...ENT BANK w Push keys corresponding to the desired channel e Push the M CH key to set the selected memory channel Input for memory channels not available is cancelled Channel selection D Using the M CH...

Page 22: ...copy paste function is helpful to keep or confirm the previously programmed contents q Push M SET to temporarily store the displayed frequency mode etc M appears Only 1 channel can be stored in the te...

Page 23: ...the or CE key t Push ENT to input the set name q Select the desired bank using M CH BANK or ENT BANK w Push CE NAME A cursor appears at the first character space of the name area When no data is prog...

Page 24: ...channel you wish to delete w Push BANK for 1 sec One of INS 1CH DEL 1CH ADD 10CH or ADD 1CH appears and flashes Push BANK momentarily to exit the condition and return to the previous display if desire...

Page 25: ...ory channels cannot be added inserted into a memory bank when the FREE bank is empty D Adding inserting memory channels USR T BLANK USR T BANK BANK INS 1CH USR T BANK BLANK Insert 1 channel USR T BANK...

Page 26: ...u to increase scan efficiency by searching for specified channels only thereby increasing the rate at which the scan cycles through the memory channels Set high priority channels as select channels me...

Page 27: ...ever when a signal is received the received frequency is automatically written into a memory channel in the auto write bank Preparation written memories condition Push and hold AUTO to enter the writt...

Page 28: ...ry scan or memory select scan respectively w Select the desired mode to operate the scan in via the mode switches The mode select function is applied to memory or memory select scan e Push MEMO or SEL...

Page 29: ...tart Voice scan control function This function is useful when you don t want unmodu lated signals pausing or cancelling a scan When activated the receiver checks received signals for voice components...

Page 30: ...s Scan pauses when finding a signal and then resumes or is cancelled depending on the selected scan resume condition There are 3 resume conditions Push DLY one or more times to select a resume conditi...

Page 31: ...SPEED control the scan delay is determined by the set value of 3 to 18 sec D Scan delay Longest delay time 18 sec Shortest delay time 3 sec DELAY DELAY DELAY SPEED DELAY SPEED The function of the DEL...

Page 32: ...performing step q above the receiver returns to the previous display e To confirm the set sleep period push SLEEP momentarily one time Be careful not to push the switch more than once oth erwise the...

Page 33: ...q Push POWER to turn power OFF w While pushing SLEEP push POWER to turn power ON Initial set mode is selected and one of its items appears e Rotate the M CH control to select the desired item r Rotate...

Page 34: ...uick rotation of the dial The auto tuning speed function is ON default ON The auto tuning speed function is OFF OFF HF ANT This item sets the active HF antenna connector on the rear panel Either the 5...

Page 35: ...dial to select a different address for each IC R8500 in the range 01H to 7FH Address set to 4AH default 4AH Address set to 01H 01H CIV BAUD This item sets the data transfer rate When AUTO is selected...

Page 36: ...nnection 13 1 25 14 Pin Port name Description Inner REMOTE Input output port for CI V format data 5 V 0 V Outer GND Grounded Pin Port name Description Inner IF OUT Frequency 10 7 MHz Output level 60 d...

Page 37: ...DC output when connecting AD 55 A S V to DC IN socket Max 2 A 3 NC 4 GND Grounded Pin Port name Description Inner SQL Grounded when squelch opens Can be deactivated via initial set mode p 31 Max curr...

Page 38: ...resume selection DLY D0 D1 D3 LSB USB AM AM narrow AM wide CW CW narrow FM FM narrow WFM Operation Cn Sc Remark Tuning step 10 00 01 02 03 04 05 06 07 08 09 10 11 12 13 11 00 10 20 30 13 00 01 03 04...

Page 39: ...kHz 10 MHz 1 MHz 1 GHz 100 MHz End of message code ASCII code BCD code area only needed when 13 is selected I C R 8 5 0 0 FE FE E0 4A FA FD Preamble code PC s address IC R8500 s address NG code End o...

Page 40: ...is reset NOTE Resetting the CPU clears all memory con tents and returns internal settings to their factory defaults Cleaning If the receiver becomes dusty or dirty wipe it clean with a dry soft cloth...

Page 41: ...right r Replace the top cover J12 UT 102 FL 52A cw narrow filter The IC R8500 has a CW narrow mode which pro vides better S N signal to noise and also rejects nearby interference The CW narrow filter...

Page 42: ...t then open the unit to expose the bottom r Unsolder the feet of the internal crystal unit then remove it t Place the CR 293 in the space available as shown in the diagram then solder its feet into pl...

Page 43: ...de for HF antenna An RF attenuator is activated Fix the coaxial cable Connect an antenna Connect an antenna matched to the re ceiving frequency Check the antenna connection Select the proper antenna c...

Page 44: ...se lected bank pgs 25 26 p 19 Memory scan does not function Two or more SEL CH are not specified in the selected bank Set 2 or more channels as SEL CH in the selected bank p 23 Select memory scan does...

Page 45: ...60 dB 30 1000 MHz 50 dB typical 1240 1300 MHz Audio output power More than 2 0 W at 10 distortion with an 8 load IF shift variable range More than 1 2 kHz External speaker connector 2 conductor 3 5 m...

Page 46: ...nting bracket for mobile operation Not available in European countries due to local regulations CT 17 CI V LEVEL CONVERTER For remote control of up to 4 receivers from 1 PC You can set memory con tent...

Page 47: ...Soden Y Furukawa General Manager Icom Europe GmbH Communication Equipment Auf der Krautweide 24 65812 Bad Soden am Taunus Germany i ii iii iv v Declare on our sole responsibility that this equipment...

Page 48: ...Hirano ku Osaka 547 0003 Japan Intended Country of Use GER FRA ESP SWE AUT NED POR DEN GBR BEL ITA FIN IRL LUX GRE SUI NOR 33 EUR A 5395H 1EX t Printed in Japan 1996 2010 Icom Inc Printed on recycled...

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