[pskmail] Re: Aw: Disaster response/ Alternate frequencies?
- From: Tarmo Huttunen <tarmopaha@xxxxxxxxx>
- To: pskmail@xxxxxxxxxxxxx
- Date: Wed, 6 Aug 2014 02:46:11 +0300
Sorry all, I accidentally sent unfinished post...this shoul be correct
version
Sam, this is interesting subject.
I let you know some rough suggestions about CB and PMR frequencies. I have
tried AndPskmail with pmr and 10 meter ham band (which is quite near of CB
frequencies). I have also some experience about local CB but if I remember
right, I have never used CB with PskMail.
I live on countryside on inner Finland, which is forest-covered quite flat
area. 10 meter band works nicely on local communication here, I have try it
for PskMail-based aprs-location sending with different set-ups.
On 10 meter band with decent base station (like cheap vertical antenna on
15 meter high) can locally have range of tens of kilometers to car stations
with about 1-meter whip. (Or handheld CB with 1-meter whip and couple meter
of groundwire.)
CB like 10 meter works well on forest areas, and generally on countryside
which have not so much electrical interference. Often there are lot of
interference on daytime, depending on solar activity. This may be a real
problem also.
SSB modulation became legal at CB radio some yers ago (I think in most
European countries), SSB can give better range, but is kind of tricky to
use. AM modulation works also fine, is easy to use and AM-CB-radios are
really cheap. There are also CB-models with VOX, which make connection
between radio and soundcard/android device simple. I believe using ham
digimodes in CB is legal today in Finland, (and also in PMR).
I have also tried PMR with AndPskamail and range here have been
disappointment: these high frequencies do not work well on forest. But I
prefer PMR over CB on urban area, because generally higher frequencies
suffer less with interference. If using PMR, it is important to get radio
as high as bossible. If you have heard about "range extenders" or "parrot
repeaters", I ques they do not work with pskmail, because of timing issues.
As you know, PMR-radios with VOX can be bought very cheaply. Generally, if
PMR is advertised as for example "6 mile range", range is about 1 mile if
you are lucky and 2 mile if you are really high.
Shortly, CB on countryside, PMR on city and if you are going to buy radio,
check it is with VOX. (Voice activated transmission ). On legal aspect, the
most important thing is to NOT modify radio.
Tarmo
2014-08-06 1:56 GMT+03:00 Tarmo Huttunen <tarmopaha@xxxxxxxxx>:
> Sam, this is interesting subject.
>
> I let you know some rough suggestions about CB and PMR frequencies. I have
> tried AndPskmail with pmr and 10 meter ham band (which is quite near of CB
> frequencies).
>
> I live on countryside on inner Finland, which is forest-covered quite flat
> area. 10 meter band works nicely on local communication here.
> On 10 meter band with decent base station (like cheap vertical antenna on
> 15 meter high) can locally have range of tens of kilometers to car stations
> with about 1-meter whip.
>
> CB like 10 meter works well on forest areas, and generally on countryside
> which have not so much electrical interference. Often there are lot
> SSB modulation became legal at CB radio some yers ago (I think in most
> European countries) and there are also models with VOX, which make
> connection between radio and soundcard/android device simple. I believe
> using ham modes in CB is legal today in Finland, and also in PMR.
>
>
>
>
> 2014-08-05 17:57 GMT+03:00 Hans Freitag <zem@xxxxxxxxxxx>:
>
> Hi Sam,
>>
>> Am 2014-08-05 14:39, schrieb sam@xxxxxxxxxxxxxxxxxxx:
>>
>>
>> I understand now that your current implementation is hard coded for
>>> ham frequencies. I also didn't realise that hams were forbidden to use
>>> 446. Does that also apply to CB 26.9650 – 27.40507?
>>>
>>
>> In general you are only allowed to use licensed Radios, with PMR and CB
>> the radio
>> has a licence, in Amateur Radio the operator has one. 26.9-27.5 is not
>> assigned to
>> ham radio services, so we all have to use the license that comes with the
>> CB radio.
>>
>> You are also not allowed to use encryption on Ham Radio. A hamradio
>> transmission
>> must be able to be fully interpreted by anyone.
>>
>>
>> Would it be legal
>>> to use PSKmail protocols on 26.9650 – 27.40507 frequencies in Europe?
>>>
>>
>> There are some people who are using APRS with CB Radios, but you have to
>> look at your countrys laws. PSK31 is a modulation, it is usually produced
>> by
>> setting your Radio to SSB mode, and then sending a NF PSK31 via Soundcard.
>>
>> You may Ask in some CB Radio board if some sort of PSK modulation is not
>> forbidden with CB Radios.
>>
>>
>>
>> Would CB use require forking the PSKmail code by non-hams? At present
>>> the Serval design is for it to be usable with those without radio
>>> licences which is why I'm pushing at this possibility, even though I
>>> realise the range will be significantly shorter than if using HF.
>>>
>>
>> My Experience is, that all my friends that are actually interested in
>> Radio Applications and Digital Modes are Ham Radio Operators.
>> We have a Licence training in our Hackingspace in Vienna once a Year.
>>
>> The Main Problem is to find enough people in reach of your Radio or Wlan
>> that are interested in your work and want to spend time.
>>
>>
>>
>> Additionally it also seems that where PSK/ Ham users were interested
>>> in Serval, and physically available in disaster situations they/you
>>> could provide useful backhaul on HF out to the public internet if
>>> Serval was integrated into your work/code as you have suggested.
>>>
>>
>> I am working on a similar System right now, which is called QTC-Net,
>> that is especially designed for Ham Radio use. http://www.qtc-net.org/
>> That is also the reason why I am on this list. ;-)
>>
>> I think it may be possible to use a Rhizome journal to transmit
>> QTC-Net Messages between two pools, I avoided to set one standard
>> here, to be more flexible on the Integration level. Unfortunately
>> I can only write a Maximum of about 100 lines a day. :)
>>
>>
>>
>> Yes the 'wormhole' was how I was imagining it. Not sure if this
>>> 'diagram' will work. But might help
>>>
>>
>> You may measure the Bandwith that is used by those Serval Text messages,
>> if it is more than 250 Baud/s you cant use that link as backbone.
>>
>> I am facing this bandwidth problem with my QTC Net Development
>> right now. Signatures, for example, are eating up _half_ of the available
>> bandwidth. I have to reduce everything starting with the message, I am
>> even
>> thinking if it would't be better to use less accurate hashsums and smaller
>> RSA Keys in combination with a bitlevel text compression to reduce the
>> Size
>> more.
>>
>> The consequence is that I can use a low bandwith HF connection only for
>> selected data that is needed really by the remote node. I expect that a
>> full syncronisation must be done over some sort of high speed Backbone.
>>
>>
>>
>> Is there any possibility for running the server code on an Android
>>> device? Or does it need a lot of processing power?
>>>
>>
>> Android devices usually have enough processing power, your main Problem
>> will
>> be that there is no FLdigi on android.
>>
>> So far, many regards from vienna...
>>
>> 73 de OE1SRC
>>
>> Hans
>> --
>> This final error message indicates a successful installation of a
>> UNIX GIS cluster node.
>> This is not an error, as the misleading message may suggest.
>> (found at Sterling Commerce Knowledgebase)
>>
>>
>
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