[OZAPRS] HF APRS

Ray Wells vk2tv at exemail.com.au
Mon Feb 2 09:07:08 EST 2009


That would be great Jack, thanks.

Ray vk2tv

Jack Chomley wrote:
> Ray,
>
> I have not been on 20 metres much, but my SCS Tracker DSP TNC records 
> the freq error of stations ireceives and then sends out a beacon with 
> the callsigns and freq differences. Now, I have been using my Icom 
> 718, so I have not relied too much on the errors, but I could hook up 
> my 7200 that has a .5PPM TCXO and see what happens ;-)
>
> 73   Jack  VK4JRC
>
>
>
>
> At 07:51 AM 2/02/2009, you wrote:
>> Hi Ian,
>>
>> I wonder if propagation is the problem? I can't say emphatically that 
>> I'm "on frequency" but the rig is a Codan running a full Codan spec 
>> crystal which are generally very reliable. The Codan uses a single 
>> crystal for both tx and rx so if one is off, so is the other.
>>
>> My heard list is light on today but it has been reasonably full. So, 
>> is it Mother Nature, or have I shifted?
>>
>> Maybe others would like to comment on my frequency status, although, 
>> one of the stations I've logged (over 13,000 packets) is vk3my, a net 
>> frequency reference station. Based on that I'm inclined to blame 
>> Mother Nature.
>>
>> Ray vk2tv
>>
>> Ian Bennett wrote:
>>> Hi Ray,
>>>         Pardon my ignorance but I thought the 30m freq was 
>>> 10147.6KHz when using 1600/1800 Hz tones.
>>>         Answers a few questions though. A few weeks ago I was 50Hz 
>>> down and was getting in through you but now I am on 10147.6Khz, I'm 
>>> only in through VK4UN and VK5LY.
>>>
>>> Ian
>>> VK1IAN
>>>
>>> On Mon, 2 Feb 2009 07:45:21 Ray Wells wrote:
>>>
>>>> Kinda looks like there's plenty of standards from which to choose.
>>>>
>>>> I'm using 14105.09 USB (1600/1800Hz) because there was previous 
>>>> activity
>>>> there in VK. When my heard list included an Italian station I went
>>>> searching and found that there were quite a number of international
>>>> stations also using the same frequency that I'm on.
>>>>
>>>> It looks as if there are two principal 20m aprs frequencies. The
>>>> question for VK is, which one should we use? Given that there was
>>>> general acceptance of a bbs also being available on an aprs frequency
>>>> for travellers, perhaps I (we) should stay put. I doubt that there 
>>>> will
>>>> ever be enough bbs traffic on the 20m frequency for it to be 
>>>> considered
>>>> a nuisance - there are no bbs mail broadcasts, and access currently
>>>> requires a connection to my node (vk2tv-1) first, and than a 
>>>> connection
>>>> from there to the bbs. The connection procedure could change to a 
>>>> direct
>>>> connection but that won't increase the traffic level.
>>>>
>>>> With 20m Igates in their (renewed) infancy in VK, now is the time to
>>>> decide which way we want to go.
>>>>
>>>> Already Scott vk2hse and myself have gates running, and perhaps 
>>>> Samantha
>>>> has a gate running as well. Are there others, like the one in vk6?
>>>>
>>>> Discussion please.
>>>>
>>>> Ray vk2tv
>>>>
>>>> Michael Zwingl, OE3MZC wrote:
>>>>
>>>>> HF-APRS 14.103 LSB 300Baud (1600/1800Hz tones)
>>>>>
>>>>> see:
>>>>>
>>>>> 80m      3610                USB                Robust-PR
>>>>> 1500Hz          via DB0UAL robust pr
>>>>> 40m      7032,6             USB                300 Baud FSK 1700Hz
>>>>> 40m      7035                LSB                300 Baud FSK 1700Hz
>>>>>
>>>>> 30m      10.147,6          USB                300 Baud FSK
>>>>> 1700Hz world wide HF-APRS
>>>>> 30m      10.151             LSB                300 Baud FSK
>>>>> 1700Hz           same QRG as above!
>>>>> 30m      10.147,3          USB                Robust-PR
>>>>> 1500Hz           world wide RPR-APRS
>>>>>
>>>>> 20m      14.102,0          USB                Robust-PR
>>>>> 1500Hz           via DB0UAL robust-PR
>>>>> 20m      14.103             LSB                300 Baud FSK
>>>>> 1700Hz           world wide HF- APRS
>>>>> 20m      14.103,3          LSB                Robust-PR
>>>>> 1500Hz           world wide RPR-APRS
>>>>>
>>>>> 17m      18.102             LSB                300 Baud FSK 1700Hz
>>>>>
>>>>> 15m      21.117             LSB                300 Baud FSK 1700Hz
>>>>>
>>>>> 10m      29.250             FM                1200 Baud FSK
>>>>> 1700Hz 1000 Hz shift
>>>>>
>>>>> check your AFSK center frequency of your TNC or Soundcard modem, 
>>>>> since
>>>>> every model has different tones,
>>>>> which will result in a different DAIL-QRG. For normal 300 baud packet
>>>>> mode a hf-frequency accuracy
>>>>> of +-20Hz is essential. For Robust-Packet mode (OFDM) frequency drift
>>>>> of abt. +-240Hz is allowed.
>>>>> Do not overdrive (overmodulate) your transmitter. Check for 
>>>>> distortion
>>>>> due to hf ingress and
>>>>> keep your signal clean and narrow in bandwith.
>>>>> ----- Original Message ----- From: "David and Justine Olsen"
>>>>> <davejust at bigpond.net.au>
>>>>> To: "Australian APRS Users" <ozaprs at aprs.net.au>
>>>>> Sent: Friday, January 02, 2009 11:55 AM
>>>>> Subject: Re: [OZAPRS] HF APRS
>>>>>
>>>>>
>>>>>> I believe 14109, someone will correct me if I am wrong
>>>>>>
>>>>>> On 2 Jan 2009, at 20:50, Samantha Scafe wrote:
>>>>>>
>>>>>>> freq?
>>>>>>> ----- Original Message ----- From: "David and Justine Olsen"
>>>>>>> <davejust at bigpond.net.au>
>>>>>>> To: "Australian APRS Users" <ozaprs at aprs.net.au>
>>>>>>> Sent: Friday, January 02, 2009 7:25 PM
>>>>>>> Subject: Re: [OZAPRS] HF APRS
>>>>>>>
>>>>>>>
>>>>>>>> Prefer 20m
>>>>>>>> so standard calls can use it
>>>>>>>>
>>>>>>>> On 2 Jan 2009, at 18:54, Samantha Scafe wrote:
>>>>>>>>
>>>>>>>>> Hi
>>>>>>>>>
>>>>>>>>> Just enquiring is there a need for a hf gate in cairns.  If
>>>>>>>>> there  is I am more then willing to facilate it
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Kind Regards,
>>>>>>>>>
>>>>>>>>> Samantha Scafe
>>>>>>>>> System Administrator
>>>>>>>>> Scott-Welsh Holdings Pty Ltd t/as
>>>>>>>>>              Regional Internet Connect
>>>>>>>>>              Aussiewide Internet
>>>>>>>>>              Cairns Net Services
>>>>>>>>>
>>>>>>>>> EMAIL: samantha at regionalconnect.com.au
>>>>>>>>> WEB: www.regionalconnect.com.au
>>>>>>>>>             www.cairns.net.au
>>>>>>>>>
>>>>>>>>>             www.aussiewide.com
>>>>>>>>> ADSL  :  DIALUP  :  WEB HOSTING  :  3G WIRELESS  :   ADSL2+  :
>>>>>>>>> MAIL HOSTING  :  VOIP  :  HARDWARE
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> HEAD OFFICE:  1/82 LAKE STREET, CAIRNS, QLD 4870
>>>>>>>>> POSTAL ADDRESS: PO BOX 1282, CAIRNS, QLD 4870
>>>>>>>>> CAIRNS: 0742220707  | TOWNSVILLE: 0747954504 | BRISBANE:
>>>>>>>>> 0731177610  | GOLDCOAST: 0756683106 | MELBOURNE: 0386859275 |
>>>>>>>>> SYDNEY: 0281979774
>>>>>>>>>
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