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Just keep in mind the old adage "You get what you pay for..."

Hi Ibtissam, first of all, thanks again for your help. If I switch 57 9600bps Mode OFF, the communication doesn't work correct, even with the audio connection from pc soundcard. 63 USB2/DATA1 Func can only be set to or , but not to So I cannot try your suggested settings. Best regards

I got it working. The file I sent to the radio had memory channels in banks 1, 2, and 3. Here is what I had to do...in memory mode (normal memory mode, not memory bank) select a random memory, press and hold V/M key. "F" blinks in display. Rotate the dial to a bank that you don't have memories registered to. Press the V/M key to save. Now, while in memory mode, pressing "band" switches between all memories and memory bank mode. Memory mode displays "memory" for a moment, memory bank mode will display the "bank number/name" for a moment. In memory bank mode, press "F" then "band", now use the knob to select what bank you want, then press "band". Pressing "F" then "scan will scan just the bank previously selected.

That's interesting. It reminds me of Hellscriber. In "hell", each letter is composed of an 8x5 grid of blocks that are either black or white. The presence or lack of a carrier at a given time sets the blocks black or white. As far as I can tell, it goes from top down and left to right in an 8x5 grid. "Slow hell" is slow enough to hear that, given "1" is signal and "0" is no signal, "11000011 00100100 00011000 00100100 11000011" would print "X". A photo in gray scale could be sent in the same manner by increasing the number of blocks to 800x600 and changing number of bits per color to represent levels of gray. But your idea is different from that... you want to go over each of the 800x600 blocks with one bit several times to selectively increment the black content. Its a good idea and may spread out and lessen the contrast of errors. However, in the first paragraph, 800x600 positions at 7 bits of data per position (for 2^7=128bit gray scale), comes to 800x600x7 = 3,360,000 bits of data to transfer the...

My suggestion is to get rid of ADMS-10 and buy the RT Systems programming (and cable) for the radio. Yaesu programming software is notoriously bad and very limited compared to the RT Systems product. I did this with my very first Yaesu HT and I haven't looked back...

I know this thread is old. I had resolved the issue, and was able to scan one bank at a time. My radio was reset while using ADMS-10. I sent the file I had stored on the computer to the radio. The information is back on the radio, but now it is back to scanning all the memories, and I again can't get it ti scan just one bank. In fact it says "no bank" again, even though I manually registered memory channels to banks, which fixed it the first time around.

Hi, Thanks for the respons. Yes, I'm proposing a new communication mode to send images. I'm thinking of a mode like SSTV. As there are N^2 patterns and an equal number of observations needed to completely encode an NxN image, you'll need a lot of carriers ; Basically, the mode encodes N*N linear equations on the spectrum for an NxN image. It is possible to spread the equations over time, to achieve a slower version with lower bandwidth. I think we need to assign a frequency, a number, to a Hadamard pattern.

This article is a good one. It gets right into the theory and math. 6 pages. http://bcpink.com/KB3IFH/files/Download/Gamma%20Match%20article.pdf

Thank you essbee. HF is on my horizon.

Hello from Lynchburg, VA - not so far from you. I want to welcome you to the forums. You have quite a background in comms. I enjoy 2M/440, and also HF. Sent from my SM-G950U using Tapatalk

That's pretty much your only constraint - I've made a few of these antenna and they all worked great (to a degree). They're performance is similar to a dipole but with far less noise. Bear in mind, if you put 100W into it your capacitor should be rated for about 10kV so mount it out of reach of children & animals. Performance at ground level is pretty good, although I used a 1.5m diameter one just sitting on the carpet on the first floor (worked all continents). Anyway, try to find a nice big variable capacitor and make up a remote tuning device with lots of gear reduction...

In my case I would like to know how long the heliax is to rf. For one it will be for single band use and I don't think I require a tuning capacitor of any great value, so I can use a simple wide spaced one, home made. Secondly, I would like for the coupling loop to be around the 1/5th of the main loop. I've got a feeling that the heliax needs to be cut a fair bit shorter, I mean when you look at the corrugations closely, the outside length must be far greater than straight pipe. I am surprised that there is no mention of this anywhere with quite a few builds using heliax and the like, but I suppose most of these are multi band and they are utilising larger tuning caps. I want to keep mine as simple as possible for single band which may also help with the efficiency. Jeremy.

It won't matter, the tuning capacitor will handle the tiny mismatch...

Make sure you have those radials on it when you tune it in the backyard. And surrounding objects, especially metallic, can alter your swr readings, but then again there are the surroundings where it will be mounted on your roof and height above ground that may change things up. So you may find yourself taking it down again if you’re fussy about swr.

Thanks, wow few to consider there!

Thanks Phil, just Googled such a project and looks useful to the shack too.

Thanks for the pointers.

Hi thanks, certainly is the plan, course has an exam date for mid May. Maybe look to going Full in 2020 on new syllabus.

Be careful running a mkII (or any 706) into high swr for any amount of time. While true that it should fold back power, those finals are not available as replacements unless you cannibalize another rig. A manual tuner is almost a necessity for multi band operation IMO. Experiment & enjoy!

Experiment! Marconi didn't have any antenna reference books; nor did he have the Internet. He did pretty well. Try a dipole cut for one band (where you are licensed to operate). Take lots of time and lots of notes

Gate dip oscillator, sinad meter, diode ring mixer, UHF swr meter, function generator, RF field strength meter, rubber ducky direction finder, three-voltmeter impedance measurement setup, TDR pulse generator, avalanche oscillator... I have been wanting to try a Lecher Line with LED sliders instead of Geissler tubes.