[UK-CONTEST] Re: FT-1000MP timings - part 2

[Ian White, G3SEK]

Chris Tran GM3WOJ wrote:
>Hello again Ian et al
>
>Decided to be a bit more scientific here - these timings are measured using
>a Tektronix 7704A oscilloscope, on an FT-1000MP (June 1997)
>Serial no. 6F100185  (I use the 'Band-data' pin 2 to switch the external
>P.A. via a switching transistor, but this was not used for these tests)
>Front panel 'BK-IN' button pressed. Rear panel LIN.AMP slide-switch 'off'
>On RX, CW keying line = +4.4 V,   rear panel 'Band-data' DIN socket
>Pin 2 (TX GND) = +13.8 V.    (Both lines go to 0 V when key closed)
>
>>1. Delay from first key-down to appearance of the fastest PTT output on
>>the rear panel.
>Key-down to Band-data Pin 2 => 0 V,       =  0.4 ms
>
>>2. Delay from first key-down to first appearance of RF output.
>Key-down to 1st RF output,    =  10 ms    (this is with menu 7.4 set to '0'
>i.e. minimum software delay in RF output.   With menu 7.4 set to '10',
>time delay = 13 ms)
>
>>3. With key locked down, but also a DIN plug in the BAND DATA socket to
>>activate the TX ENABLE line... delay from grounding the TX ENABLE line
>>to first appearance of RF output.
>Not able to test this.   I think by TX ENABLE you mean what Yaesu call
>TX INHIBIT (Band-data DIN skt. Pin 8)
>
Yes, sorry.

If you haven't built everything back into the station again, it is 
possible to do this test without the correct 8-pin DIN plug. Just poke a 
wire into pin 8, and then use any old empty DIN shell to open the 
grounding switch in the socket.

>>4. Delay between key-up and end of RF output.
>= 5 ms
>
>All above timings are the same with either full break-in (BK-IN button
>pressed)
>or semi break-in (VOX button pressed but BK-IN button not pressed)
>With semi-break in, however, menu 7.5 comes into effect and holds the TX
>on after the key is released for the chosen time-delay.
>Hope this helps !

Certainly does - thank you *very* much!

-- 
73 from Ian G3SEK         'In Practice' columnist for RadCom (RSGB)
                            Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek