From: yoony@aix02.ecs.rpi.edu (Young-Hoon Yoon)
Subject: Re: Standard HT 528 receive mods (999MHz
Date: Sat, 7 Nov 1992 08:37:20 GMT

dplumb@cix.compulink.co.uk (Dave Plumb) writes:

>> Appended below this is a table (which I keep as an Excel spreadsheet), 
>> listing the various functions in rather abbreviated form - I'd be very 
>I have a list the same as yours, but I've wordstarred it into a small point 
>size, and printed it out, credit card size. I took it down to a local 
>graphics printshop and have three of them heat sealed into an A5 plastic 
>sheet for around 3 quid. Very handy, and it you do it the right size, it will 
>fit behind the battery, between the belt clip and leatherette case. Useful 
>when you can't remember how to scan from one frequency to another! 
> 
>> Note the extra memory channels - there are actually 20 on each band, the 
>> upper 10 are accessed as shown below (accesed with a F+A prefix key, 
>I think these have a strange effect if you try and use an offset frequency, 
>something like the bar memories can't have different tone squelches, a 
>problem over here where tone squelch is used to stop multiple access on UHF. 
>Should you also require a split offset, individual transmit receive frequency 
>within one memory, this uses up the other "bar" memory channel. Once 
>programmed, you can't clear the "bar" memories out, unfortunately. 
> 
     ---------------------  Stuff Deleted  -----------------

Just to clearify the C528 memory situation, the C528 has 10 memory per band.
From my experience with the HT, each memory location seems to consist of 2
cells.  The first cell stores the frequency and the + or - offset mode.  
The second cell is used to store the CTCSS status; tone encode or encode/decode
, the offset value and the CTCSS tone value.  Alternatively this cell can
also contain an odd offset frequency(eg.  Store separate frequency for transmit
and receive).  When this mode is active you will see a +- together for offset
mode.  Third mode is to separate the cells entirely and have two distinct
memory locations.  When this mode is active you should see a small dot to the
right of the memory number near the bottom of the memory number, and you can
flip between the regular and the bar memory.  In this mode( Each memory cell 
pair can have one of three mode independently of the other memories) you can
have a total of 40 memories, but the information usually stored in the second
cell is instead gotten from the VFO instead.
  The bar memories can be cleared.  You can just wipe them like you normally
do with CL-number combination.  In order to change the memory mode from one
to the other, you will have to cancel the mode and enable the other mode.
To cancel from mode 2 and 3, you will just have to store an offset value
to the memory that you need to clear.  But instead of the usual way, press
Func-Enter when you are at the Offset Set mode.  This should return the memory
back to mode 1 where the two cell are linked into one.

Now a question to anyone that knows the C528.  My HT is actually a C520 that
I bought from Japan and have since made some internal chip diode mod to force
it to think that it's a C528A.  The only function that I don't have is the
Tone Burst.  I believe that to send the tone burst one only has to press
the Call button while pressing the PTT.  This does nothing on my HT.
I know that the U.S. repeaters do not require a Tone Burst, but I've tried
other chip diode configurations and I simply can't get it to work.
Does anyone know what need to be done to over come this problem??
For those of you that have the European model, what is the configuration of the
chip diode Q202 and Q203??  Do you have one or both and what are their
polarities??

73....DE N6ZUD
yoony@rpi.edu
Newsgroups: rec.radio.amateur.misc