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1  eHam Forums / Computers And Software / FIF-232C and FT-900 problem on: July 13, 2006, 07:51:24 PM
Hello All

I have just aquired a still boxed FIF-232C for use with my FT-900 but seem to have struck an issue.

I have tried multiple CAT software packages including HRD and several Comms cables and the problem occurs with all.

Symptoms as follows

Any instruction to the rig to change frequency or mode or go into TX mode etc is performed faultlessly and is indicated on the software display briefly but then the radio seems to return randomly changing frequency and command information to the software.

The freq readout on the control software seems to scroll randomly from one wild frequency to the next and other mode and switch indicators display and change and turn off randomly also. The rig itself stays on the last set frequency and mode and operates normally however.

I do know that there are a couple of pull up resistors in these units that need to be cut under certain situations but do not really have enough information to be sure whether I need to follow this route.

Any insight or help would be very welcome

Regards
Ari

VK4ARI
2  eHam Forums / Mods And Repairs / Yaesu FT-920 Transmit Mod on: June 07, 2006, 07:30:27 AM
Hi There

I did a search on the FT-920 tongiht being a happy owner and found this question in a few places. In the absence of the correct link to the previos posts here's a but and paste of my reply. Hope it's of some help,

Hi There
There are two mods doing the rounds to open up the TX range of the FT-920. The first one regards reflashing the radio firmware with a different version and uploading the new image into the radio.

DO NOT perform this mod on a U.S. spec FT-920. It will render the radio non functional and lighten your wallet no small amount. As with most Yaesu radios there is a "green wire" mod. In the case of the 920 the wire will be found under the DSP unit which requires the case removed and 3 screws out which secure the DSP unit. You then simply cut the wire and power up hold a certain button combination.

I really would rather not mention which combination here but you should now have enough information to find the right mod at least. Failing that feel free to contact me.

Note, this mod worked as advertised on my FT-920. No guarantee is given or implied that it will work for you and the information supplied is in no way to be seen as encouragment to do so.

Regards
Ari
VK4ARI
3  eHam Forums / Mods And Repairs / Yaesu FT-920 60 Meter Mod on: June 07, 2006, 06:48:24 AM
Hi There
There are two mods doing the rounds to open up the TX range of the FT-920. The first one regards reflashing the radio firmware with a different version and uploading the new image into the radio.

DO NOT perform this mod on a U.S. spec FT-920. It will render the radio non functional and lighten your wallet no small amount. As with most Yaesu radios there is a "green wire" mod. In the case of the 920 the wire will be found under the DSP unit which requires the case removed and 3 screws out which secure the DSP unit. You then simply cut the wire and power up hold a certain button combination.

I really would rather not mention which combination here but you should now have enough information to find the right mod at least. Failing that feel free to contact me.

Note, this mod worked as advertised on my FT-920. No guarantee is given or implied that it will work for you and the information supplied is in no way to be seen as encouragment to do so.

Regards
Ari
VK4ARI
4  eHam Forums / Elmers / Nets, WX Reports? Element 4 ? What the #!&$#!! on: April 04, 2006, 09:36:06 AM
Hi Gene and crew

I'll have a stab at answering the two questions posed in good faith and I'll keep it non personal or inflamatory if I can. I'll throw in some background first for perspective.

Obviously things are not exactly the same in the U.S. and here in Australla with the various licence classes and requirements, but we have pretty much the same debates over much the same issues.

I haven't been an Amateur for 45 years like some who have posted here, I'm not even that old yet but I have an interest in radio communications going back to when I was a little bloke in the early seventies. I enjoyed radio so much that I did an apprenticeship as a telecommunications technician and, as many of us do who make our hobby our job, I totally took the fun out of the hobby for myself. Just ruined it as a pass time.

Once I completed my time as an apprentice I never worked in the trade again having moved on to security and I/T and the enjoyment slowly came back. I passed what would now be called a "standard" class certificate in the early 1990's (too proud to take an exemption even if allowed)and then an "advanced" class ticket about a year back just before the new testing regime came into force. Just wanted to be able to say I did it under the old rules I suppose. In neither case did I so much as open a text book or study anything excepting C.W. The 4 years trade training had to count for something I suppose. My Wife on the other hand took three attempts and several courses and kept at it until she earned her standard class. I'm far more proud of her effort than mine. She worked HARD.

So, question one. Why do people primarily talk about the weather and other trivial matters? Maybe because they can? Being a technically adept Amateur does not make one an accomplished communicator as someone here has already pointed out. The old "hows the weather and arthritis?" nets bother me sometimes as well. So I leave them to their enjoyment and go chase mine. I'm a farily bad agoraphobic at any rate so I'm such a rare copy on voice people half a mile away ask for a QSL if they hear me Wink (yes bad enough that posting in a public forum presses my buttons also but sometimes you have to be heard right?)

I get tremendous enjoyment out of my involvment in packet Radio, SSTV, providing echolink nodes and other related interests and almost never operate voice. I suggest respectfully that you too keep looking. There will be somewhere in the hobby that you find yourself at home and happy. It's limited only by your imagination.

Second question is pretty easy. I understand what you are saying when you say you will never involve yourself in the technical aspect of the hobby. I am (was?) a tech and I try to avoid it like the plague myself. Too much time working on gear eats into the time I like to spend on the things that I *do* really like. The complexity of modern gear and lack of a fully featured workshop add in there too, BUT!

We must recognise that there are those for whom the technical side of the hobby *is* their all consuming interest and in the litagatory driven world obsessed with blame and public safety there is a need for the regulatory bodies to be able to show some duty of care has been taken to make sure those who are involved in the higher levels of our hobby with potentially damaging power levels and frequencies at their disposal do infact have the level of understanding to be let loose in the community with those resources. That is what the catagory 4 (I think that is the term?) questions seem to achieve in the U.S. model and where they to be done away with something else would doubtless have to take their place or the rights  and abilities of Amateurs would soon be sacrificed on the altar of public interest and safety. Even Advanced class operators in VK are only allowed 400w PEP as a case in point.

OK, there's my two bob's worth. I hope it's been at least mildly relevant.

My best wishes in your quest to upgrade and hopes you get much enjoyment from our hobby.

Yours in Amateur Radio
Ari S Laver
VK4ARI
5  eHam Forums / Elmers / China on: March 13, 2006, 06:24:36 PM
Hi Bruce

Being on the other side of the world I realise that our propagation characteristics are very different but to give you some idea of time and frequencies.

China is workable here several nights (our time) most weeks at the moment particularly stations in Mongolia for some reason.

For us in VK it seems to be mostly between 10.00 (UTC) through 16.00Z. Frequency wise 14.200 and 20khz either side is usually good for voice and they are not uncommon to be heard working SSTV if that's your thing around 14.230Mhz and on 7.033Mhz on 40m also.

Best of Luck

Regards
Ari
6  eHam Forums / Amplifiers / AL-811a Bandwidth of Tune? on: March 09, 2006, 03:53:31 PM
Thankyou for the replies Alan and Steven

All understood on the reduced tune aspect of the situation. I'm fairly lucky in that respect. When I follow the tune up proceedure specified in the manual for SSTV and other high duty cycle modes, once I complete the tune proceedure I'm left with an output power of about 390watts  which is near enough to my allowed maximum. From that point I simply reduce drive to achieve my 120w Py for SSTV. So all things being equal, in the rare event I open up to the allowed SSB maximum on that frequency I'm not in a situation requiring an instant retune.

Thanks for the link to Tom's webpage. It's pretty comprehensive and so I've bookmarked it for an in depth read.

The 10% drop in output figure is nice to know and puts my mind at rest. Obviously I'm getting nothing like that with a change of 12Khz. I do indeed have a Welz bi directional wattmeter with realtime SWR measurement so being a conserviative sort of guy I'll re tune once I reach a 5% reduction or so.

The 3 second warm up time on the valves is already noted and appreciated. Unfortunately as I am not always in the room when the repeater beacons and do sleep occasionally (The XYL insists Wink ) Leaving it in standbye mode is not always possible.

The intention is that once the original valves pass their use by date I'll replace with 572s as suggested by Tom in another thread here solely for the extra dissapation which in a full duty cycle mode like SSTV can't be a bad idea.

Regards
Ari
7  eHam Forums / Amplifiers / AL-811a Bandwidth of Tune? on: March 08, 2006, 10:55:03 PM
Greetings

I have a Ameritron 811a which I have been using without problem here from 80 through 20m. I realise that in the U.S. these amps are considered a bit of a toy but here in VK where the Advanced Class operator is allowed 400w pep SSB and 120w Py on other modes it's just the shot reaching the target with a good reserve up it's sleeve. It's not my first valve amp but it's the first one I've really used to any degree and I rather like it. What can I say? It's "friendly" and no cracks, pops and bangs like the 2100 series =-|. I really don't want to hurt the little bloke so I have a couple of questions.

I'm not a big voice operator and my primary use for the amp is SSTV. Once tuned at the reduced current settings as stated in the manual about 8 watts input from my Ft-920 gives me the full allowed 120Py out with 250-275ma of Plate current and 35-40ma Grid indicated.

Can someone please tell me

1. Once tuned how far can I stray from the tuned frequency before I should tune again? If this is one of those questions who's answer depends on antenna loading or other factors what signs should I look for tipping me it's time to retune? I use resonant antennas without tuner on most bands. 1/2 wave verticals for the most part.

More specifically I operate a SSTV repeater on 14.242Mhz. Is it too much to ask to skip down to 14.230 to call CQ in quiet times without a retune?

2. Taking as read the usual dangers of burning the place down inherant in all electrical gear, am I doing the Amp any great harm running it 24/7 ready to go for the puproses of the repeater beaconing?

I'll probably think of something else I wanted to ask 5 minutes from now but that's the main issues on my mind at the moment.

Thanks in advance for any answers

Yours in Amteur Radio
Ari
VK4ARI / VK4PKT
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