[CCF] FW: [CQ-Contest] Re: TS870 Band data output

[jukka.klemola@nokia.com]

> -----Original Message-----
> From: ext Bob Henderson [mailto:bob@cytanet.com.cy]
> Sent: 22 August, 2002 08:51
> To: CQ-Contest@contesting.com
> Subject: [CQ-Contest] Re: TS870 Band data output
> 
> 
> A number of people have responded to my mailing requesting 
> further details.
> A few others responded pointing me to
> www.dk9ip.de/DK9IPprojects/DK9IPdecod/dk9ipdecod.html and to
> www.qsl.net/k0bx/ where information can be found on a similar 
> mod for the
> TS850.  I guess this just goes to show that most things in 
> life have already
> been done!  You just need to know where to find the details!
> 
> For those that asked I will describe the mod I have done.  A 
> look at the
> above URLs will also be worthwhile.
> 
> My initial idea was to try to find a source of 4-bit parralel 
> band data
> (Yaesu style) within the 870.  It doesn't exist as the 870 
> ships band data
> around inside the radio in serial form.  Of course this data has to be
> decoded for the purpose of switching the selector relays in 
> the Final filter
> circuit.  This job is done by IC1 on the Final filter board (TC9174F).
> 
> What I decided to do was to bring out 6 buffered switching 
> lines for the six
> HF contest bands to facilitate automatic switching of my 
> Array Solutions Six
> Pack and my six band Dunestars.  I don't need lines for 
> 30/17/12m but these
> can be available for anyone that does.
> 
> I mounted a piece of .1 inch pitch strip board about 3/4 inch 
> square on a
> DB9 female connector.  I did this by wedging the edge of the 
> strip board
> between the two horizontal sets of pins on the DB9 such that 
> pins 1-5 of the
> DB9 lined up on the centre 5 tracks of the 7 track wide strip 
> board.  Pins
> 1-5 were then soldered to the board.  Pins 6 & 9 were wired 
> with short wire
> links to tracks at either edge of the board.  I connected 6 
> npn switching
> transistor collectors, one to each of pins 1-6 of the DB9 and all six
> emitters were taken to ground.  The bases of each of the 
> transistors were
> taken via a 5k6 1/4W resistor towards the back edge of the 
> strip board to
> which I attached a piece of ribbon cable.
> 
> I connected the other end of the ribbon cable to the 
> collectors of Q10, 11,
> 12, 14, 15, 16 on the foil side of the Final filter board which can be
> located top centre of the radio under a removable metal 
> plate.  The filter
> board must be removed to make the connections.  Connection is 
> relatively
> easy as Kenwood have located spare pads close and connected to the
> collectors of these devices.  In order to make the mod neat I 
> didn't worry
> about which of pins 1-6 on the DB9 related to which band.  It 
> turned out in
> my case to be 1=20, 2=160, 3=80, 4=15, 5-40 & 6=10m.  I used BC337
> transistors which are good for switching up to 45V at close to an amp.
> 
> I removed the external auto ATU connector, which for me is 
> redundant and
> mounted my DB9 in its place.  Anyone not wishing to remove this could
> possibly feed the ribbon cable out at the back just under the 
> case top.
> 
> I claim no rocket science here.  This is just a simple mod 
> that solves what
> for me has been a significant shortcoming in the use of my 
> Kenwood TS870 for
> contesting.  I pass it on to you for what it is worth.
> 
> 73 and good contesting
> 
> Bob 5B4AGN, P3F, ZC4ZM
> 
> 
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