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Newsgroups: rec.radio.amateur.misc

From: wtm
Subject:  Here is MARS/CAP expansion for Std. C528A or Hth. HW-24-T

Message-ID: <1993Jul17.115415.14940
Summary: Opening radio / soldering NOT required.

Organization: Northeastern Ohio Universities College of Medicine

Date: Sat, 17 Jul 1993 11:54:15 GMT

Lines:97





Here is a copy of the original sheet form Heathkit.  The ht-24-t is

abosolutely identical to the C528A.  Both are manufactured by

Marantz of Japan.



Note: I did not need to press reset before entering the

modification sequence.  The memories I had programmed stayed

intact.



Note: If you change UHF bands, the contents of whatever memory is

up when you change bands may be modified.  Be sure to change to VFO

mode before changing bands.  The radio transmits anywhere, excpet

for the 800-900 MHz region.



Note: You need an apropriate license to transmit on the freqencies

enabled by the expansion process.  Unauthorized transmissions may

be lead to undesirable attention, emberassment and action by

unsympathetic government agencies.  In some locations, it may not

be lawful to montior and/or disclose content of trnasmissions in

the 800-900 MHz region.  Use discression.



Note: Not responsible for scanning errors in text below.  This

came from the original Heath sheet and I've checked it carefully.

Use at your own risk.



Question: Does anybody know if there is a function code on the

C528A that enables muting of the speaker on the opposite band when

transmitting? I am interested in using the radio on UHF/VHF split,

and want to avoid audio feedback.



73,

Bill



    ------------------- begin included text ------------------



               HEATH COMPANY TECHNICAL ASSISTANCE

                  BENTON HARBOR, MICHIGAN 49022

                          616-982-3296





             MARS and CAP modification for HW-24-T





Dear Customer:



In order  to  modify your Heath HW-24-T handheld  transceiver  to

transmit  out  of  band, please enter the code  below  from  your

keypad. After the code is entered you can use your transceiver to

transmit on the CAP and MARS frequencies.



Please  keep this modification procedure in a safe place. If  you

ever  reset  your transceiver, you will need to  enter  the  code

again.





-- Push RESET

-- Press FUNCTION (hold) and 0

-- Press FUNCTION (hold) and ENT

-- Press PTT (briefly)

-- Press UHF

-- Press FUNCTION (hold) and L (lamp)

-- Press FUNCTION (hold) and 0

-- Press FUNCTION (hold) and CODE

-- Press FUNCTION (hold) and L (lamp)

-- Press FUNCTION (hold) and 3

-- Press PTT (briefly)

-- Press VHF

-- Press FUNCTION (hold) and STEP

-- Select 12.5 KHz (with rotary selector knob)

-- Press PTT (briefly)

-- Press FUNCTION (hold) and 8

-- Press FUNCTION (hold) and 8

-- Press FUNCTION (hold) and 7

-- Press FUNCTION (hold) and 7

-- Press FUNCTION (hold) and MS.M

-- Select 144.9875 MHz. (with rotary selector knob)

-- Press FUNCTION (hold) and 0

-- Press FUNCTION (hold) and ENT

-- Press PTT (briefly)

-- Press FUNCTION (hold) and 0

-- Press FUNCTION (hold) and MS.M

-- Press PTT (briefly)



In addition to transmitting out of band, you can also receive the

frequencies  between 300 - 400 and 800 - 900 MHz. To do this  use

the code below.



-- Press UHF

-- Press FUNCTION (hold) and SET

-- Press FUNCTION (hold) and 3 (this will select bands)





---- end of included text ----

--

Bill Mayhew        NEOUCOM Computer Services Department

Rootstown, OH  44272-9995  USA      phone:216-325-2511

wtm