Date   

Re: Email problems?

leslie norton
 

Yes they can be seen by everyone on the mailing list

On 15 Feb 2021, at 11:57, scanmil via groups.io <scanmil@...> wrote:

Would someone be kind enough to confirm if my messages to the group can actually be seen by others, besides myself??

Cheers,
Adam.



Re: Email problems?

scanmil
 

Would someone be kind enough to confirm if my messages to the group can actually be seen by others, besides myself??

Cheers,
Adam.


Re: PSK63 HF APRS is Back !

Chris Moulding
 

Good to hear that FlDigi can be used as a KISS modem.

I was really disappointed when I had to remove APRS Messenger but I could find no way to run the Visual Basic 6 programming software on Windows 10 to fault find the problems running it on Windows 10.

One question about running FlDigi in KISS mode. One of the strengths of APRS is that there is error detection in the protocol used on VHF 1200 bd and HF 300 bd that rejects packets with errors.

In APRS Messenger I added a simple CRC check to prove that the received packet was the same as the transmitted one and used it to reject or not igate packets with errors. I added an option in the program so that it would display packets with errors on the display so that a human operator could read an make sense of packets some errors due to fading on HF.

I've been having a quick read of the AX25 KISS protocol and I can see that it can detect framing errors but nothing about errors in the text sent over the air.

Stephen, can you confirm from your testing that it's rejecting packets with errors in the transmitted text?

It's an important point because if it allows packets with errors through then it would allow garbage to go to the APRS-IS internet system with incorrect positions and at worst case incorrect callsigns.

Regards,

Chris


Low Band Receiving aerials.

Oyster Town (G0IFS)
 

Good morning,
Interesting topics on here. I am looking forward to better weather to proceed with the quest for improved signal to noise ratio particularly on Top Band.
I have tried most of the usual suspects, loops of all kinds, Log, bog, E field probes, passive and amplified using commercial and home brew construction. 
At the moment the best combination at this location is a mini whip phased against a well known commercial amplified steerable loop to cancel offending noises.
Next project 2 metre square amplified Cardioid loop, 1 metre circular Cardioid loop and another loop on ground as the last effort was not convincing.

Main HF transmitting aerials are doublet with 250ft top, open wire feeder to link coupled balanced matching units (one for each band), doublet 90 ft top and commercial trapped vertical.
None of them used for receive of course!


Re: PSK63 HF APRS is Back !

Kenny Witt
 

Great!  Been working with com0com for years.  Lots of possibilities there

Kenny, KC4OJS 


On Feb 14, 2021, at 5:11 PM, WA8LMF via groups.io <wa8lmf@...> wrote:


On 2/14/2021 4:54 PM, WA8LMF via groups.io wrote:

Ever since APRS Messenger was discontinued, I have been lamenting the loss of a vastly superior (compared to 300 baud AX.25 packet) HF APRS transmission mode. 

I discovered that the FLdigi multi-mode sound card app can act as a KISS modem to external applications.   After a considerable amount of testing, tweaking and experimentation, I have got FLdigi to work with various APRS clients on PSK63, MFSK16, 8PSK-250 and other modes provided by FLdigi.


Forgot to also mention:

The gateway page to my various mapping APRS igates/webservers for the various bands and modes is:

   <http://WA8LMF.net/map>




Re: PSK63 HF APRS is Back !

WA8LMF
 

On 2/14/2021 4:54 PM, WA8LMF via groups.io wrote:

Ever since APRS Messenger was discontinued, I have been lamenting the loss of a vastly superior (compared to 300 baud AX.25 packet) HF APRS transmission mode. 

I discovered that the FLdigi multi-mode sound card app can act as a KISS modem to external applications.   After a considerable amount of testing, tweaking and experimentation, I have got FLdigi to work with various APRS clients on PSK63, MFSK16, 8PSK-250 and other modes provided by FLdigi.


Forgot to also mention:

The gateway page to my various mapping APRS igates/webservers for the various bands and modes is:

   <http://WA8LMF.net/map>




PSK63 HF APRS is Back !

WA8LMF
 

Ever since APRS Messenger was discontinued, I have been lamenting the loss of a vastly superior (compared to 300 baud AX.25 packet) HF APRS transmission mode. 

I discovered that the FLdigi multi-mode sound card app can act as a KISS modem to external applications.   After a considerable amount of testing, tweaking and experimentation, I have got FLdigi to work with various APRS clients on PSK63, MFSK16, 8PSK-250 and other modes provided by FLdigi.

1)   FLdigi provides a KISS output over TCP/IP -- not a virtual serial port. This means that either:  Your APRS client must support KISS-over-IP -- Or that you do an IP<-->serial conversion for older com-port-oriented APRS applications such as UIview.   


2)   The IP-to-serial conversion can be doe with the freeware utility "com0com" and it's companion application "com2TCP"



3)   I am now operating FLdigi-mode igates on 30 meters and 60 meters  24/7, from my QTH in East Lansing, Michigan (center, more-or-less of the lower peninsula of MI.  

On 30 meters, I an using the same channel center as the classic 300-baud AX.25 packet APRS.  On 30M, place the radio on 10.147.60 MHz USB, which will place FLdigi modes with 1700 Hz audio center tones exactly on 10.149.30 MHz RF -- i.e. midway between the 10.149.20 / 10.149.40 tones of AX.25 packet APRS.   

On 60 meters, I am using US 60M "channel 5" (carrier freq of 5.403.50 USB). 


4)   The setup on each band is a Yaesu FT-857 with a 500 Hz Collins CW filter.   This is just wide enough to pass the conventional 300 baud HF packet APRS, and also the narrower FLdigi modes such as PSK63, MFSK16, 8PSK-250, etc.  Don't try wide modes such as Olivia 1000 or MT63 -- they just won't fit through the 500 hz passband.


5)   Full details on setting various APRS clients to work with FLdigi (including the IP<-->serial bridge if needed) are here on my website:

    <http://WA8LMF.net/FLdigiAPRS>



Stephen H. Smith    wa8lmf (at) aol.com
Skype:        WA8LMF
EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
Home Page:          http://wa8lmf.net

-- APRS over FLdigi Modes  --
   <http://wa8lmf.net//FLdigiAPRS/index.htm>

60-Meter APRS!   HF NVIS APRS Igate Now Operating
   <http://wa8lmf.ddns.net:14447/>

Flying Digipeater!
   <http://WA8LMF.net/FlyingDigi>

11 Copies of UIview in Action on One Computer!  
Live Off-The-Air APRS Activity Maps
   <http://wa8lmf.net/map>







Re: twin turn loop on LAA+ and experimenting weekend.

Simon
 

Hi

Not sure if we on same page here..

I thought u we’re talking about 252khz..
Using cardioid’s on there nw or se gives me rte ireland or algeria radio..( depends upon which way loops are switched.) but i now think you were talking degrees..opps.

Now on 590khz..usb..( so as to remove lsb .) se direction no vocm..nw s9 or so vocm no splatter..

Remember cardioid loop has much lower angle of radiation compared to standard loop but does not have the 90 degree deep null..but with 2 and a steerer that i hope will be available..watch this space..

Pic of steerer being made..not finished yet..Will not be so untidy!!



The idea of the null steerer ( Chris pointed me at this.) is to allow the general direction of the broadside cardioid loops to be facing nw or se ( as mine are,) but to allow the null to be steerable around the loops..
How much/ large / size degrees steerable is to be seen..but in theory it should be alot..one hopes to be able to steer the null to 90 degrees to direction of loop..
Not tried this before..so learning..only used null steerer/ phaser to cancel noise on antennas..
rather alot of effort in making this null steerer though..( hand making pcb’s etc.) so i do hope it works!!if it does not then no great lose as it will make a good noise canceller..

Testing as soon as the Po decide to deliver some well late relays!!

Simon


Re: twin turn loop on LAA+ and experimenting weekend.

Kev Haworth
 

Simon.
If i 'Beam' directly to 252 , it is massive, 30 db over easily on the s meter. go 90 degrees against it and the cardioid drops it to s9,

I'm seeing lots of 'sproggies' spururious  on the cardioid though. back to a 'standard' loop i think..


Re: twin turn loop on LAA+ and experimenting weekend.

Simon
 

Hi Kev

Glad to have helped..

Question..when u say its tamed 252 from 9+30 to less than 9..what do you mean??

I may be missing something here..
At my qth with the cardioid loops broadside with switchable directions..nw or se

I get 2 completely different stations if i switch from nw to se..both s9 but nw station a . Se station b..

Or was it a typo??

Simon ( not really a lw or mw dx hunter, so lacks info..)

Thanks..


Re: twin turn loop on LAA+ and experimenting weekend.

Kev Haworth
 

Simon..

Brilliant, thank you for the detailed and easy to understand reply, perfect.

Cardioid is built and receiving on 60M, don't know how directional it will be at that Freq. I've pointed it west to see how VOCM compares to the spanish monster, It is working well as it can tame 252 from 30 over to S9 or less..

I'm struggling with the wind here tonight(!) there must be a loose connection somewhere as the noise floor is all over the place. 


Re: twin turn loop on LAA+ and experimenting weekend.

Simon
 

Hi

Was about to say use air con tube!! More maluable..better quality copper and cheaper

I use single and twin turn mag loops for trx.
The twin turn is for 160-80m..only reason its a twin turn is to keep the size sensible..no way i can get a 7m dia loop up in my tiny back yarden in east london. A single loop would rx better ( larger capture area..( tried both on a 40m trx loop.single turn tx same rx better.)
Also for rx only small non cardiod active loops the idea is to keep inductance low..a twin turn will more than double the inductance without increasing the capture area..so a no go..

Parallel crossed loops do work though..but as of yet i have not worked out/ tried converting one to cardiod..if it can be done then they would be a winner..( where to fit the resistor is the issue.)

The 2m cardioid loop does work well ( but its still not a 150m beverage) but i had to alter the input transformer on my preamps..
On mine i used a 16:1....9:1 on ccw
73 core is good..though 43 works but drops efficiency down low. If using ccw preamp then its just a case of rewinding the little transformer on the input..easy..

So in short..dont bother with twin loop for rx.

Simon


Re: twin turn loop on LAA+ and experimenting weekend.

Kev Haworth
 

Just found Wolseley.co.uk do a 3/8 (9mm) refrigeration pipe for £16 retail... That's a game changer.. Still be interested on your thoughts on what a twin turn loop would achieve over a single turn..


twin turn loop on LAA+ and experimenting weekend.

Kev Haworth
 

That's my four days of trekking around the UK done, Curry, Biscuits and Washing Powder all delivered to Regional Delivery Centres. 

Time for some antenna play! Before I pass out the £40 or so on some 8mm x 6M Cupro Nickel, I'd like to ask what effect a twin turn loop would have on receive only?

The experiment part of the weekend is to turn my loop into a cardioid, resistors are here, ground rod being picked up tomorrow morning. Hopefully I'll be able to hear across the pond a bit easier this time tomorrow evening.

I've also a 1:1 current balun to wind to sit in front of the SDR to 'try' and reduce any noise that is coming in, it'll be useful for when I start to transmit again in the near future.

I bought some Tripp Lite USB cables and they have helped quite a bit with noise from Raspberry Pi getting into SDRPlay RSPDX...

The struggle continues, have a great (and safe) weekend folks.


Re: How to make a cardioid loop with a Loop Antenna Amplifier +

Tom Crosbie G6PZZ
 

Can you get heatshrink in camo? :-)

-----Original Message-----
From: CrossCountryWireless@groups.io <CrossCountryWireless@groups.io> On Behalf Of Simon
Sent: 09 February 2021 23:02
To: CrossCountryWireless@groups.io
Subject: Re: [CrossCountryWireless] How to make a cardioid loop with a Loop Antenna Amplifier +

No i use 1/4 w ..but am changing to 2w carbon just to make a more sturdy connection that can be encased in heatshrink tubing..

Simon


Re: How to make a cardioid loop with a Loop Antenna Amplifier +

Simon
 

No i use 1/4 w ..but am changing to 2w carbon just to make a more sturdy connection that can be encased in heatshrink tubing..

Simon


Re: How to make a cardioid loop with a Loop Antenna Amplifier +

Kev Haworth
 

Reading your reply, Simon, you mention NOT to use wirewound resistors on a cardioid loop,  I understand this is due to their self inductance and capacitance issues.

Open question, is there any merit in using a higher power rating (10 Watts upwards) for the resistors?

ATB

Kev


Re: VLF/LF/HF Active Vertical Antenna...5 kHz to 30 MHz Discontinued!

Chris Moulding
 

Hi Robert,

Thanks for your kind comments on the antenna. I think you probably got one from the last few batches where we used 2 mm thick tube for the elements.

Due to the Covid-19 situation we are limiting the time in the workshop so  some products that took a lot of workshop assembly were put on hold until things hopefully get back to normal.

I've checked and we still have some amplifier boards, the boxes are the standard polycarbonate ones we use for our other products so we would only need to order some tubing to make another batch.

When we have another batch ready I'll post details on the forum.

Regards,

Chris


VLF/LF/HF Active Vertical Antenna...5 kHz to 30 MHz Discontinued!

Robert, VA3ROM
 

Just had a look at the CCW website to buy another VLF/LF/HF active vertical antenna and much to my shock and dismay it was in the discontinued list!!

Sales drives survival so I'm guessing that it wasn't worthwhile cost wise to keep this outstanding performing antenna viable.

Any antenna that can survive in Canada's brutal winters, snow and ice storms and perform well especially on the VLF and LF bands is a keeper. It's been the only way for me to receive the basement beacons.

Is there any backstory to it and any hope of the antenna coming back in another shape or form that can perform down low.

73,
Robert, VA3ROM


Re: Ground rod on a loop

Simon
 

Didnt we in uk just get told to hide under a table if all hell between usa and ex ussr took place?

Good to know that my solid pine table is radiation proof..lol

Steve..pirate radio?? One needs to pm me..

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