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VK2TV > TNC 19.08.07 00:18l 40 Lines 1301 Bytes #999 (0) @ WW
BID : 23769_VK2TV
Read: GUEST DK3HG
Subj: Re: What tnc do you all use ?
Path: DB0FHN<DB0FOR<DB0MRW<DB0ERF<DB0FBB<DB0IUZ<DB0GOS<DB0RES<TU5EX<I0TVL<
F6CDD<F6BVP<VK2TV
Sent: 070818/2212Z @:VK2TV.#MNC.NSW.AUS.OC #:17493 [Kempsey, QF68JX] $:23769_VK
From: VK2TV@VK2TV.#MNC.NSW.AUS.OC
To : TNC@WW
# Generated by: TstHWin v2.21b - Registered to VK2TV
# On : 8/19/2007 8:05:17 A
# UTC: 8/18/2007 22:05:17
>From: ZL1ABS@ZL1AB.#06.NZL.OC
>To : TNC@WW
>
>
>Hi Steve,
Hello Michael and all,
>I have a MFJ1278B that isn't getting much use presently as it has a habit
>of crashing if left running all day. When it crashes it locks the PTT on.
>Also the MFJ1270B can lock the PTT on, so I have external 555 timers to
>prevent the transmitter from staying on too long & burning out.
>The MFJ TNCs are supposed to have watchdog timers, but the timer isn't in
>the most effective part of the circuit. The timer is placed before the
>PACTOR mode PTT switching circuit that's implicated in the PTT locking on
>problem when the TNC crashes.
I've always found the WDT on the MFJ 1270B to be very effective ... unless
the defeat jumper is installed :-)
>I have a project to built a simple 1200 baud modem equivalent to the
>BAYCOM serial port modem, but using a XR2211 PLL IC & 566 Oscillator IC,
>but I haven't made it operate properly yet.
I built my own PCB to duplicate the TCM3105 modem that came with the USCC
card (also an ISA version), but back then I had a handful of the TI chips
laying about from redundant Baycom style modems.
Cheers ... Ray
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