[600MRG] [Lowfer] NDB and NAVTEX Station Details

[Edward R Cole]

I went on Southern Avionics website to get info when I acquired my 
NDB a few years ago.  I saw 25, 50 and 100w models listed.  Mine is 
rated at 50w but runs 100w easily with no trouble.  The heat sink is 
very large and I supplement cooling with a 48v fan run by the 55v B+ 
supply.  I also searched records of many AK NDB's and found some that 
were higher power.  Most nights I can copy them out beyond 1000 miles.

73, Ed - KL7UW

At 12:07 PM 4/8/2015, Merv Schweigert wrote:
>Canadian NDB must run 100 watts,  there are a number of them for sale on
>ebay,  call letters and freq on the front of the transmitters, and 
>they are 100W
>rigs.
>
>73 Merv K9FD/KH6
>
>>Frank,
>>
>>     1) No
>>     2) ?
>>
>>     Navtex transmitters run over 1kW out, most (but not all) NDBs 
>> run 25W. NDB's operate mostly at the lower end of the LF band 
>> where antennas are less efficient than at 518kHz, and NAVTEX 
>> stations tend to have better (bigger) antennas anyway.
>>
>>  Some useful references:
>>http://www.nautelnav.com/solutions/navtex/vector-series-1500w-3000w-navtex-transmitters/ 
>>
>>
>>http://dxinfocentre.com/navtex.htm
>>
>>http://www.classaxe.com/dx/ndb/rna/
>>
>>73 Warren
>>
>>
>>
>>
>>
>>On 4/8/2015 2:28 PM, Frank Lotito wrote:
>>>
>>>
>>>
>>>Two questions:
>>>(1) Is there a US Government web site that associates a particular 
>>>NDB or NAVTEX station with authorized maximum RF power (be it ERP 
>>>or RF transmitter output) and that station's basic antenna 
>>>details? Is there a Canadian web site with similar details for 
>>>Canadian NDB and NAVTEX stations?
>>>(2) For those NAVTEX stations having both 490 and 518 KHz 
>>>transmissions, do those stations use the same transmitter and 
>>>antenna for both bands (with appropriate band switching circuits), 
>>>or do they use dedicated systems for each band?
>>>   With invaluable guidance from K3SIW,  I have become aware of 
>>> NAVTEX transmissions and the YaND SeaTTY software.  It amazed me 
>>> how much stronger the NAVTEX transmissions seem to be in 
>>> comparison to NDBs located at approximately the same distance away from me.
>>>73 Frank K3DZ / WH2XHA
>>>
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>>
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73, Ed - KL7UW
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