Re: TR-4CW S meter stays to the right
Hey John I'm sorry I didn't get back to you sooner. I'm the only Ham around that I know about? I just got back into HF a couple of yrs ago.
I did try two meters a few times but can't seem to find anyone to talk to and I don't really know where any groups are? Haven't really looked.
I did manage to go onto a video chat thing (I can't recall it off the top of my head?) but the bunch on there were very very rude!
They would just sit around, drink beer and rank on each other so I quickly stopped associating myself with that kind of an atmosphere.
When I first got licensed about 50 yrs ago I had a brand new Yaesu FT-101ZD MKIII that I paid around $600 for.
That rig was tubes but I had a really good antenna set up. Sadly I had to sell everything after 3 months due to too many complaints from the neighbors with their TV's
Times have changed and I rent instead of living with my Grandfather today
and the best antenna that I can do is a half wave dipole. It's a wire or nothing. So I will take the wire.
My mind is not the same as 50 yrs ago. No, my memory fails most of the time along with confusion and extreme tiredness.
50 yrs ago I bet if I had this rig I could tune it up quickly without a problem but it's not 50 yrs ago now is it?
I do what I can and thank you for replying to my topic
Mark
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Re: Email for Sindre LA6OP?
Evan, You got mail !!!!
Sindre, LA6OP
Does anybody know a valid email for Sindre?? I've not been able to receive a response for the past several years.
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Thank you for Sindre's email
Yes, Ken, that email works.
Thanks to those that provided me with the needed info!
73,
Evan, K9SQG
Evan, You got mail !!!!
Sindre, LA6OP
Does anybody know a valid email for Sindre?? I've not been able to receive a response for the past several years.
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Diego,
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The 54/74S287 versions of the IC have the tri-state outputs. I believe Drake used the open-collector outputs part (387 suffix). You should check the Drake manual to see whether the '287 will work.
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Either way, I recommend you install an IC socket, just in case you need to change the part again in the future.
?
Regards,
?
Mark, G4FPH.
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Jim, I¡¯d really appreciate it if you could share the code!
Mark, thanks so much for the information. I¡¯ve managed to find a DM54S287 memory chip in my country. If I happen to run into issues with it, I¡¯ll order another one from the websites you recommended.
As you mentioned, having the code makes it much easier to modify and adapt it to whatever memory is available.
Thanks again for all your support and contributions!
?
73
Diego
LU3HDD
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Re: Email for Sindre LA6OP?
This is the email I found and LA6OP was last seen on APRS about 11 days?ago.
73, Harry PA2HG
Does anybody know a valid email for Sindre?? I've not been able to receive a response for the past several years.
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Sign me up for one of those blower wheels.
TNX
Jim Zellmer, KA0VSL Simpsonville, SC
hi there.
?
this is Pd0fw from the netherlands?
would like to have also 2 of those blower wheels.
?
thx?
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Re: Email for Sindre LA6OP?
Yes, it does! Sindre LA6OP
Evan, You got mail !!!!
Sindre, LA6OP
Does anybody know a valid email for Sindre?? I've not been able to receive a response for the past several years.
|
Re: Email for Sindre LA6OP?
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Evan, You got mail !!!!
Sindre, LA6OP
Does anybody know a valid email for Sindre?? I've not been able to receive a response for the past several years.
|
Re: Email for Sindre LA6OP?
Evan, You got mail !!!!
Sindre, LA6OP
Does anybody know a valid email for Sindre?? I've not been able to receive a response for the past several years.
|
Does anybody know a valid email for Sindre? ?I've not been able to receive a response for the past several years.
|
Diego,
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Interesting that your TR7 has a type MMI6300 PROM fitted. I posted some data regarding this manufacturer of PROM in the files section (folder 'TR4310'). These old type of bipolar PROM were used in video arcade machines, so there is good information on the www about substitutes.
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I had a bad Signetics 82S123N PROM in my Drake TR4310 transceiver and I purchased an MMI6331 part (a seller on eBay in UK had some) as potential replacement. In the end, I made a workaround using unused and working data space in the original (bad) PROM, so did not need to programme / use the MMI device. You can search for 'TR4310' as a topic if you are interested in the details.
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Several eBay sellers in the UK and other countries advertise the 265 x 4-bit, MMI6300 and its substitutes N82S126N, DM74S387N for reasonable prices.
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Hopefully you can get the code that Jim has burned into a new device. I gather the 'blank' value for some makes of these bipolar PROM can be '0' instead of the normal '1' value for EPROM.
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Regards,
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Mark, G4FPH.
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The following items have been added to the Files area of the [email protected] group.
By: atlasstuff <g4fph@...>
Description:
Possible substitutes for PROM in TR4310 (and TR7)
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Re: Off topic - AL80A transformer
Guillermo, I have a tube that looks like that. It was given to me to use as display. I also have one that looks like the same thing will happen to it if it's used more. You can see cracks in the welds at top of the anode connecting the upper "pin" Both of these are the type with the vertical plate fins like your picture. Can you still read the date code?
Bob W4JFA?
Many thanks for the answers.
The owner is a local ham, he was using it without problem until the
"boommm..". I suspect he was pushing it too hard.
There's indeed a nice short between plate and grid. A replacement tube
is already at hand, but I want to clear all other things before I plug
it into work.
My main concern is about the high value of primary current (in standby
mode), without any major load.. and the HV flickering .. perhaps I'll
try the transformer for isolation with a megger.
Regards
Guillermo - LU5WE.
El 8/4/25 a las 17:33, Willy - LU5WE via ±ð²õ³¦°ù¾±²ú¾±¨®:
>? ????GA, and sorry for this off topic message;? working in the above
> mentioned amplifier, it's the USA version (no 10m, just 160 ..15), so I
> think it's the US domestic version. This amplifier came to my workbench
> because the owner fried the 3-500z (see plate structure tilted), fuses,
> step start resistor.
>
> Transformer wired with both winding in series (for 220V, 50 Hz in my
> country, actually a little higher ... 226V), and the blower in parallel
> with one winding. Blower works fine.
>
> Turned on, and on standby I have a steady 2.2 A of mains current. I've
> disconnected all secondaries.
>
> All secondaries connected again, about 2900V somewhat flickering plate
> voltage, 5.5V filament, and 13.3V (12VDC line). 2.3A mains current.
>
> Is this high current consumption because the iron core, in this
> "domestic" amp is calculated only for 60 Hz lines?.
>
> Regards
> Guillermo - LU5WE.
>
>
>
>
>
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i try to contact No8j for a blower wheel its very hard to contact him.
any body nows more?
thx Pd0fw Fred
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hi there.
?
this is Pd0fw from the netherlands?
would like to have also 2 of those blower wheels.
?
thx?
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Re: TR-4CW S meter stays to the right
Maybe it¡¯s when I neutralize the finals?
I read somewhere (I forgot where?)
a good way is to:
1) Tune up on 10 meters into a 50 ohm dummy load with a power meter
2) Remove screen voltage to finals
3) connect a T connector to RF output
4) connect other end of T to a 50 ohm dummy load
5) Connect T portion to Oscilloscope
6) Tune neutralization capacitor until you get minimum signal on scope
8) Put back the screen voltage connection.
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I¡¯m used to working on high voltage at my company so I use an insulated tuning stick with caution!
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I then tune up my MFJ or LDG?
antenna tuner for less than 2:1
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That¡¯s my standard way
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Mark
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Upload it to the files section of the group??? Or perhaps doing so is
not permitted?
73
Stan
KM4HQE
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On 4/8/25 18:59, Jim Shorney via groups.io wrote: I have the code. if you want I can send it to you.
On Tue, 08 Apr 2025 16:48:30 -0700
"Diego Gallo via groups.io" <lu3hdd@...> wrote:
In my country, my friend is able to source the DM54S287 memory device. Our current project is to generate the binary code that will be programmed into the memory to ensure proper system operation. --
73
-Jim
NU0C
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Re: Tuning a pi-Network Output
Here's a picture of the old cap.
Barry - N4BUQ
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I think the original was an C0G/NP0 because it has "C0" labeled on it. I don't
see >1kV in C0G/NP0 and, given the hot environment it's in, I'm concerned
something else may vary too widely with the heat. Of course, it's not an exact
value for all bands anyway but I wanted to try to minimize that effect. I'll
keep looking.
Thanks,
Barry - N4BUQ
If the original was 2KV that is the minimum that I would replace it with.
On Tue, 8 Apr 2025 11:12:59 -0400 (EDT)
"n4buq via groups.io" <n4buq@...> wrote:
BTW, I bought 1kV NP0 caps. Apparently the original is 2kV. Does that really
need to be a 2kV cap?
--
73
-Jim
NU0C
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Re: Tuning a pi-Network Output
I think the original was an C0G/NP0 because it has "C0" labeled on it. I don't see >1kV in C0G/NP0 and, given the hot environment it's in, I'm concerned something else may vary too widely with the heat. Of course, it's not an exact value for all bands anyway but I wanted to try to minimize that effect. I'll keep looking.
Thanks,
Barry - N4BUQ
toggle quoted message
Show quoted text
If the original was 2KV that is the minimum that I would replace it with.
On Tue, 8 Apr 2025 11:12:59 -0400 (EDT)
"n4buq via groups.io" <n4buq@...> wrote:
BTW, I bought 1kV NP0 caps. Apparently the original is 2kV. Does that really
need to be a 2kV cap?
--
73
-Jim
NU0C
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Mark N2DMI
Bob W4JFA
