Heathkit

HW-24 extended RX mod

 

To widen the receiving range of the HW-24-HT:
 
  1. Turn POWER on.
  2. Push RESET switch.
  3. Press FUNCTION(hold) and STEP, rotate CH to 12.50 kHz.
  4. Press CLEAR(#).
  5. Rotate CH to 146.0375 MHZ.
  6. Press FUNCTION(hold) and RPT.
  7. Press FUNCTION(hold) and +.
  8. Press FUNCTION(hold) and ENTER. Release buttons.
  9. Press FUNCTION(hold) and ENTER.
  10. Press CLEAR(#).
MARS/CAP expansion for HW-24-T

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

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

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)

Bill Mayhew NEOUCOM Computer Services Department
Rootstown, OH 44272-9995 USA phone: 216-325-2511
wtm@uhura.neoucom.edu amateur radio 146.58: N8WED

 

 

ATTENTION
The KB2LJJ takes no responsibility for any damage during the modification or for any wrong information made on this modification.