[OZAPRS] Fw: 10MHz HF Gateway -Re: New to list

[Ray Wells]

I use a Codan 6801 here for 20m packet and a Tracker Lynx for 40m 
packet. They're both crystal locked rigs that are built like the 
proverbial brick dunny. They are designed to be driven all over the 
Australian outback and maintain stability to licencing authority 
standards. I obtained both of mine for free, you can't get any cheaper 
than that!! The crystal (just one per channel is required), made to 
Codan specs, cost $30 from Hy-Q.

Whilst talking about old Codans I thought I'd throw this in, it might 
save someone else the same head scratching exercise that I went through.

The following applies to at least the Codan 6801 and 7727 PA's which use 
identical PCB's.

My 6801 was not dropping back to receive, well not entirely. The 
electronic switching was ok but the tx/rx relay was holding up due to 
the presence of about 2.5 volts across its coil.

The problem stemmed from five rivets that connects earth pads on 
opposite sides of the PCB all suffering cracked solder joints to the 
copper pad. The rivets provide DC ground continuity to much of the PA 
board. The location of these rivets is around the PA transistors and 
heat changes is the obvious cause of failure. Given that it can happen 
on one PA board, it's a likely candidate for others as well.

If you're going to take your old Codan into remote places, it might be 
as well to have a peek at those solder joints before you leave.

Ray vk2tv

Nick Mclean (SYD) wrote:

>How about a secondhand Codan Barret or similar HF transceiver. They
>sometimes go fairly cheaply on E-Bay. Crystal locked so the stability
>should be adequate.
>73's
>
>Nic McLean
>
>VK2KXN / VK5ZAT
>
>Tel:  02 99410619
>
>Fax: 02 98139009 
>
>Mobile:  0417 822 728
>
>
>-----Original Message-----
>From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
>Behalf Of Shaun Pitcher
>Sent: Friday, 31 August 2007 1:19 PM
>To: ozaprs at aprs.net.au
>Subject: [OZAPRS] Fw: 10MHz HF Gateway -Re: New to list
>
>
>My problem exactly.  I don't want a feature rich radio siting behind the
>
>seat.  I looked at a low power 30m radio, from Emtronics I think, with
>the 
>idea of a linear and modifying it to take the APRS signal.  Bit of a 
>stability issue though as it uses a knob for turning, however that could
>
>be overcome as well.
>
>
>
>Regards, 
>Shaun Pitcher   
>
>spitcher at energy.com.au 
>
>
>
>
>
>"Damien Gardner Jnr" <rendrag at rendrag.net> 
>Sent by: ozaprs-bounces at aprs.net.au
>31/08/2007 10:14 AM
>Please respond to
>VK / ZL  APRS Users  <ozaprs at aprs.net.au>
>
>
>To
>"VK / ZL  APRS Users" <ozaprs at aprs.net.au>
>cc
>
>Subject
>Re: [OZAPRS] 10MHz HF Gateway -Re:  New to list
>
>
>
>
>
>
>Hmm, an IC706 looks like major overkill just for APRS though?  Since it
>was suggested that I'd be better looking at using 30m for APRS when I'm
>on the road, I've been looking for nice compact 12V 30m HF rig.. There
>don't seem to be any 'cheap and simple' ones available - just lots of
>nice expensive multi-mode feature-rich things like the 706, which just
>seems like a waste, sitting behind the back seat doing nothing but APRS
>:(
>
>Cheers,
>
>Damien
>
>-----Original Message-----
>From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
>Behalf Of Andrew McDade
>Sent: Friday, 31 August 2007 8:17 AM
>To: VK / ZL APRS Users
>Subject: Re: [OZAPRS] 10MHz HF Gateway -Re: New to list
>
>Hi All,
>
>I must concur with Andrew Rich. I've been using a IC706Mk2G mobile on
>30m 
>now for 4 or 5 years. The 30m aprs frequency was programmed into memory
>and 
>netted to vk3my "once" back 4 or 5 years ago. With all the bush bashing 
>around Australia over this time, I've never had to re-net to vk3my. It 
>certainly says something about the stability of modern transceivers.
>
>Regards .. Anndrew #2 .. VK5EX
>
>----- Original Message ----- 
>From: "Andrew Rich" <vk4tec at people.net.au>
>To: "Mike Zwingl oe3mzc" <oe3mzc at oevsv.at>; "VK / ZL APRS Users" 
><ozaprs at aprs.net.au>
>Sent: Friday, August 31, 2007 5:28 AM
>Subject: Re: [OZAPRS] 10MHz HF Gateway -Re: New to list
>
>
>  
>
>>I bought a new radio - it no drift
>>
>>
>>
>>
>>    
>>
>------------------------------------------------------------------------
>----
>  
>
>>Andrew Rich VK4TEC
>>vk4tec at people.net.au <mailto:vk4tec at people.net.au>
>>http://www.tech-software.net
>>
>>
>>
>>
>>-----Original Message-----
>>From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au]On
>>Behalf Of Mike Zwingl oe3mzc
>>Sent: Friday, 31 August 2007 5:52 AM
>>To: VK / ZL APRS Users
>>Subject: [OZAPRS] 10MHz HF Gateway -Re: New to list
>>
>>
>>Gday,
>>just one comment on HF-APRS Gateway operation:
>>in practice it is not the signal to noise ratio that decides about
>>    
>>
>decode 
>  
>
>>or
>>nodecode of an APRS beacon on 10Mhz.
>>More important is to use a TNC that allows some frequency drift, like
>>    
>>
>the
>  
>
>>DSP-TNC from SCS.
>>The DSP-TNC is currently the only hardware that will simultaneously
>>    
>>
>decode
>  
>
>>several APRS signals at same time in a 800Hz wide channel!
>>So the frequency offset of a mobile station can be plus/minus 400Hz
>>    
>>
>and
>  
>
>>still have successful decode on 10.147,6 USB (10151LSB)
>>See the result at VK6UZ-4 and VK8ZAB-4, Fritz and Alan are using these
>>    
>>
>
>  
>
>>TNCs.
>>Most other TNCs/Soundcards require 30Hz accuracy in frequency, which
>>    
>>
>is
>  
>
>>almost impossible to achive.
>>www.scs-ptc.com/datasheets/scs_datasheet_tracker_english.pdf
>>vy 73 de Mike
>>oe3mzc
>>ex VK3FPF/8
>>----- Original Message -----
>>From: "Ray Wells" <vk2tv at exemail.com.au>
>>To: "VK / ZL APRS Users" <ozaprs at aprs.net.au>
>>Sent: Tuesday, July 17, 2007 10:48 AM
>>Subject: Re: [OZAPRS] New to list
>>
>>
>>    
>>
>>>Hi Michael,
>>>
>>>Based on experience gained from forwarding into vk3 and eastern vk5
>>>      
>>>
>on
>  
>
>>>30m, I appeared to be well placed to be a HF gate, especially for
>>>      
>>>
>those
>  
>
>>>areas. Both of those areas were open into here for at least 20 hours
>>>      
>>>
>a
>  
>
>>>day, and with solid results.
>>>
>>>I use UIView on the Windoze machine but I have to say that Xastir
>>>      
>>>
>walks
>  
>
>>>all over it, in my opinion, but I am biased towards Linux's
>>>      
>>>
>flexibility
>  
>
>>>and reliability.
>>>
>>>I'm very lucky with this rural location. Noise level on HF is usually
>>>S0, excluding lightning type noises.
>>>
>>>Cheers
>>>Ray vk2tv
>>>
>>>      
>>>
>>>>Hi Ray,
>>>>Welcome, I did some tests on HF last night and see your station gated
>>>>        
>>>>
>me
>  
>
>>>>to the 'net!
>>>>It's good to have another HF APRS gateway up and running. When I get
>>>>motivated, I'm going to set one up near Port Lincoln. I have all the
>>>>gear, I just need a couple of weekends to get it installed.
>>>>Mine gateway will be around 10km out of town on a friends farm, RX
>>>>        
>>>>
>only,
>  
>
>>>>using a Codan X2 on 10.147.6MHz with a  MFJ-1278 TNC, and serial
>>>>ethernet server linked back my my QTH via a community wireless
>>>>        
>>>>
>network.
>  
>
>>>>Probably going to use UIView at this stage.
>>>>HF is far too noisy at home.
>>>>Regards,
>>>>Michael.
>>>>VK5ZEA
>>>>
>>>>Ray Wells wrote:
>>>>
>>>>
>>>>        
>>>>
>>>>>Hi All,
>>>>>
>>>>>I'm new to this list and want to advise that I recently commenced
>>>>>running a HF gateway from near Kempsey NSW, halfway between Brisbane
>>>>>          
>>>>>
>and
>  
>
>>>>>Sydney, on 10147.60. The rig is a TS430 running about 25W to a
>>>>>          
>>>>>
>dipole
>  
>
>>>>>favouring about WSW/ENE. Callsign is vk2tv-4.
>>>>>
>>>>>Close to being implemented is a 2m digi on 145.175 that will also be
>>>>>gated to the network, and will cover a stretch of the Pacific
>>>>>          
>>>>>
>Highway
>  
>
>>>>>from about 40km south of Kempsey to a point about 30km north.
>>>>        
>>>>
>>>>>Ray .. vk2tv
>>>>>
>>>>>
>>>>>_______________________________________________
>>>>>Ozaprs mailing list
>>>>>Ozaprs at aprs.net.au
>>>>>http://aprs.net.au/mailman/listinfo/ozaprs
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>          
>>>>>
>>>>_______________________________________________
>>>>Ozaprs mailing list
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>>>>
>>>>
>>>>
>>>>        
>>>>
>>>_______________________________________________
>>>Ozaprs mailing list
>>>Ozaprs at aprs.net.au
>>>http://aprs.net.au/mailman/listinfo/ozaprs
>>>      
>>>
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>>
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