[OZAPRS] Re: 40m Traffic & TX DELAY

David and Justine Olsen davejust at bigpond.net.au
Sun Apr 5 08:09:50 EST 2009


Ray

Thanks, I will try 10 mS

David

On 5 Apr 2009, at 08:03, Ray Wells wrote:

> David,
>
> I just looked at my configs and I have a value of 40mS on HF and  
> 20mS on VHF. I can't recall how I arrived at those figures but they  
> may have been recommendations (starting points?) from an old  
> document from the father of KISS, Phil Karn, about the time the Ark  
> was being built :-)
>
> Given that you are not having any obvious problems with a value of  
> 0, maybe a low, belts & braces values of say 10 or 20 might be  
> appropriate.
>
> Ray vk2tv
>
> David and Justine Olsen wrote:
>> MixW has a Tx tail setting, currently 0
>>
>> Do you have any recommendations for my soundcard setup with  
>> respect to TxTail.
>>
>> David
>>
>> On 5 Apr 2009, at 06:01, Ray Wells wrote:
>>
>>> In my early days of running HF for the BBS I experienced some  
>>> variable results that I attributed to TXD being marginal. Setting  
>>> TXD to 450mS ironed out that problem and it remains the value I  
>>> use with The Kenwood TS430, a Tracker Lynx and a couple of Codans.
>>>
>>> There is another setting which, although largely deprecated, can  
>>> prove useful on HF, and that's TXTAIL, the purpose of which is to  
>>> hold the TX up to ensure the data has cleared the radio. It's  
>>> like TXD in reverse.
>>>
>>> It's certainly still available as an option with KISS TNC's in  
>>> Linux kernel ax25, and my Baycom USCC> 4, four port internal card  
>>> has it as well.
>>>
>>> Ray vk2tv
>>>
>>> Tony Hunt wrote:
>>>> David. I dont know what others are running but I run 480mS .. I  
>>>> messed about
>>>> with TXDelay on 30m a while back with Tiny Trackers and found  
>>>> that figures
>>>> closer to 500mS seemed more reliable. I remember some earlier  
>>>> TNC2 firmware
>>>> for VHF that came out with default Txdelays of 300mS . Surely  
>>>> its going to
>>>> be higher as a rule on HF !!
>>>>
>>>> I wonder what everyone is running as a rule?
>>>>
>>>> Of course it all depends on different radios your running etc  
>>>> etc.. It also
>>>> depends on different receivers that others are running and  
>>>> software and
>>>> squelches etc. Those latter things are all out of your control..
>>>>
>>>> I picked some frames up from you on 40m early this morning  
>>>> around the grey
>>>> line at 0413 local. The same with ZL4TZE-4 at the same time. So  
>>>> Ive got 8
>>>> stations on the heard list so far.
>>>>
>>>> Tony Hunt  VK5AH
>>>>
>>>> ----- Original Message -----
>>>>> Date: Sat, 4 Apr 2009 14:14:08 +1000
>>>>> From: David and Justine Olsen <davejust at bigpond.net.au>
>>>>> Subject: Re: [OZAPRS] 40m Traffic & TX DELAY
>>>>> To: Australian APRS Users <ozaprs at aprs.net.au>
>>>>> Message-ID: <5DF92CC8-3A97-461B-97F8-2B9C3E37F8F3 at bigpond.net.au>
>>>>> Content-Type: text/plain; charset=US-ASCII; delsp=yes;  
>>>>> format=flowed
>>>>>
>>>>> I have a very short packet, but my Tx delay is 300mS
>>>>>
>>>>>
>>>>> David
>>>>>
>>>>
>>>>
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