Well, not sure if this is the right group or not, but we will find out.
Working on restoring an NCX-500 (very similar to the National 200, or NCX-200) transceiver. I am located very close to a 50kw AM broadcast station on 1030 Khz and have noticed that these rigs are subject to front end overload in the receiver. I found it necessary to put a high-pass filter inline with the antenna to eliminate an abundance of birdies and other stuff.
Something to be aware of...
Bob,? K7DYB
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Robert, It's the right group, just hardly anyone here. Not a lot of people who have National radios have found this group yet. I started it just before the rules changed for basic groups here. Otherwise, any new group after that change would incur a fee after membership reached 100. I created some for the more popular vintage radio brands and this is one of them. Whether it grows to become useful in time we will have to wait and see. The Icom group grew pretty fast, and the antenna tuners group is growing at an even faster rate. But the vintage groups aren't building up steam yet. Donald -- AD8DY Formerly KJ3I On Mon, 26 Apr 2021 15:49:38 -0700, "Robert Kembel" <rwkembel@...> wrote: Well, not sure if this is the right group or not, but we will find out.
Working on restoring an NCX-500 (very similar to the National 200, or NCX-200) transceiver. I am located very close to a 50kw AM broadcast station on 1030 Khz and have noticed that these rigs are subject to front end overload in the receiver. I found it necessary to put a high-pass filter inline with the antenna to eliminate an abundance of birdies and other stuff.
Something to be aware of...
Bob,? K7DYB
---------------------------------------------------- Some ham radio groups you may be interested in: /g/ICOM /g/Ham-Antennas/g/HamRadioHelp /g/Baofeng/g/CHIRP
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Hi All,
Here is another note on the above transceivers (applies to both models).
I noticed that the received signal seem "gravelly" or "raspy". This seemed to be worse on strong signals and initially I thought that it may be an overload issue. Upon further investigation, I noted that the BFO frequency was being pulled by the product detector. The plate of the BFO tube is connected to the cathode of the product detector through a 120pf capacitor. As the signal at the product detector varied, the impedance of the cathode circuit varied and changed the loading on the plate of the BFO. This was very noticeable when monitoring the plate circuit of the BFO oscillator.
I added a 100pf cap in series with the existing 120pf cap that is between the BFO plate and product detector cathode to reduce the interaction. This appeared to clear up the problem with the BFO frequency changing as a result of the received signal. I did not yet try a different BFO oscillator tube to see if it might be a tube issue.
I know these are not common rigs, but I wanted to document my experiences with others. I will post some additional notes as time permits...
Bob,? K7DYB
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I just joined the group.
I recenlty acquired a NC-98 and better than expected conditon. It does work, but poorly. I have just started replacing the caps and next plan to check the tubes to see their condition and to align it. I do have a manual.
Paul
W8SBH
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I've always liked the looks of the NC-98.? I used one with a
Heathkit QF-1 Q-multiplier added to it back
in the sixties but sold it many years ago.? Just a few years ago I
bought another NC-98 on eBay in very
nice condition and have also bought another QF-1 to go with it.
Alan, KD5R
On 5/16/2021 6:51 PM, Paul W8SBH wrote:
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I just joined the group.
I recenlty acquired a NC-98 and better than expected conditon. It
does work, but poorly. I have just started replacing the caps and
next plan to check the tubes to see their condition and to align
it. I do have a manual.
Paul
W8SBH
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Show quoted text
On Mon, May 17, 2021, 5:46 PM Alan Riley < arr44@...> wrote:
I've always liked the looks of the NC-98.? I used one with a
Heathkit QF-1 Q-multiplier added to it back
in the sixties but sold it many years ago.? Just a few years ago I
bought another NC-98 on eBay in very
nice condition and have also bought another QF-1 to go with it.
Alan, KD5R
On 5/16/2021 6:51 PM, Paul W8SBH wrote:
I just joined the group.
I recenlty acquired a NC-98 and better than expected conditon. It
does work, but poorly. I have just started replacing the caps and
next plan to check the tubes to see their condition and to align
it. I do have a manual.
Paul
W8SBH
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Paul . . . On Mon, 17 May 2021 18:41:51 -0400, "Paul W8SBH" <proinwv@...> wrote: What's QF-1? Here's an article/review about it. Do a web search and you'll find more information and even videos. Donald KX8K (formerly AD8DY) ---------------------------------------------------- Some ham radio groups you may be interested in: /g/ICOM /g/Ham-Antennas/g/HamRadioHelp /g/Baofeng/g/CHIRP
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Just signed into the group and have a few piece of National equipment. My very 1st SSB transceiver was a NCX-3 purchased new in 1963 and taken to a DX location (Midway Island then KM6). It didn’t do well. ? Am looking for some parts for a NCX-5. if any one has some spare knobs good in QRZ ? 73’蝉 Pete N6QW ? Sent from for Windows ?
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I have a National 200 tranceiver that I got when I first got licensed almost 25 years ago but it hasn't been powered up in at least 20 years. The only known issue is I burned up the audio output transformer years ago and that's when it got put away. I think everything else is good but I know that needs to be replaced and not sure if a standard audio output transformer will work or not. The real question is, is there anything in particular I should look for, be aware of or otherwise fix before I plug this monster power supply up, turn the radio on and burn my house down? surprisingly I don't find any leaking or swollen capacitors and for it's age looks pretty decent on top and underneath. In all honestly this wouldn't be a primary rig but as long as I've had it I have an attachment to it and would like to use it again if possible. I've talked with a few people on 40m AM and they seem to be running old tube radios and while it isn't a requirement to play along, t would be nice to be on one as well.
?Any help would be greatly appreciated.
Chris, KS5KY
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Re: National 200 Tranceiver
Bring it up slowly with a variac, if possible.? If not, bring it up with a series 60-watt incandescent light bulb - receiver only.? For the transmitter section, you might use a 300-watt incandescent light bulb in series.? As far as the output transformer, Hammond likely has what you need based on the output tube - 6V6?? Antique Electronic Supply, <>, is a good source for these transformers.
Dave - W?LEV ?
On Sat, May 7, 2022 at 12:06 AM Chris Bradshaw < cabrad74@...> wrote: I have a National 200 tranceiver that I got when I first got licensed almost 25 years ago but it hasn't been powered up in at least 20 years. The only known issue is I burned up the audio output transformer years ago and that's when it got put away. I think everything else is good but I know that needs to be replaced and not sure if a standard audio output transformer will work or not. The real question is, is there anything in particular I should look for, be aware of or otherwise fix before I plug this monster power supply up, turn the radio on and burn my house down? surprisingly I don't find any leaking or swollen capacitors and for it's age looks pretty decent on top and underneath. In all honestly this wouldn't be a primary rig but as long as I've had it I have an attachment to it and would like to use it again if possible. I've talked with a few people on 40m AM and they seem to be running old tube radios and while it isn't a requirement to play along, t would be nice to be on one as well.
?Any help would be greatly appreciated.
Chris, KS5KY
-- Dave - W?LEV
Just Let Darwin Work
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Selling is allowed in this group for ham radio equipment only, and at least one of the items for sale must be related to the purpose of the group. We require that anything being sold here have a price with it. So "make offer" or anything like that will not be an acceptable post here. Please indicate if shipping is included, otherwise leave it out. Also, please indicate the general location of the equipment for sale, so others will know if it’s within driving distance for them, and if you're willing to meet someone X miles away from that location.
If you have any information about the item, please add it, as it will make it more likely that it will sell.
Just list similar to the following. This was a suggestion for the SWAN-AMATEUR-RADIO group. Just replace the Swan item with one that would fit the purpose of this group:
Swan 350D, great cosmetic condition, may need new final tubes since output drops somewhat on 15 and 10 meters. Model 117XC AC power supply included. Asking $325.00 OBO. Located near Charlotte, NC. Will drive up to 25 miles from Charlotte for pickup or delivery. Call 444-444-4444, or email hamoperator@....
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Anyone figure out a good way to modify the NCL-2000’s keying circuit so that a modern transceiver can safely key it?
The amp uses the 13.8 VAC filament supply at approx 500 ma for keying. Keying AC with a transceiver’s open collector keying circuit is a no no.
I’d rather not use an outboard adapter.
Doug/WA1TUT?
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[MODERATOR NOTE: I don't know if I didn't see this pending message when it got in the queue, if my reply to approve the post did not get to groups.io for some reason, or what happened, but I'm sorry this is late.]
Hi Paul.? I had an NC-98 and a NC-190 years ago.? I liked the 98 better than the 190.? The 190 was very drifty and it had no RF stage for the AM broadcast band.? My sons now have them and they still work after I repaired and aligned them.? Good luck with your restoration.? Email me if you have any questions.? Maybe I can help you out.
73, Bob
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Thanks and good to hear from you. I replaced most of the caps and aligned it. The alignment went okay but there was one cap that went to near the end of its limit. All the tubes are okay. I added a fuse and changed the power to 3-wire.?
I suspect that some resistors need to be replaced as their body color is somewhat dull. I only checked one and it was in tolerance.
It seems to be somewhat lacking in sensitivity but then I only have an IC-7300 to compare it to. That isn't really a good pair to compare.
The big problem is why did I get it and what do I do with it now that I am done? I guess I just wanted to see what I could accomplish as physically it is in nice condition. It really is too large to economically ship considering what I already have in it. I would give it to a local youngster if I knew one who would appreciate it.
Paul W8SBH
[MODERATOR NOTE: I don't know if I didn't see this pending message when it got in the queue, if my reply to approve the post did not get to for some reason, or what happened, but I'm sorry this is late.]
Hi Paul.? I had an NC-98 and a NC-190 years ago.? I liked the 98 better than the 190.? The 190 was very drifty and it had no RF stage for the AM broadcast band.? My sons now have them and they still work after I repaired and aligned them.? Good luck with your restoration.? Email me if you have any questions.? Maybe I can help you out.
73, Bob
-- ???? ???
???? (this too shall pass)
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Paul . . . On Wed, 6 Jul 2022 21:07:57 -0400, "Paul W8SBH" <proinwv@...> wrote:
The big problem is why did I get it and what do I do with it now that I am
done? I guess I just wanted to see what I could accomplish as physically it
is in nice condition. It really is too large to economically ship
considering what I already have in it. I would give it to a local youngster
if I knew one who would appreciate it.
You might give it to a local club to loan out to new tech licensees who are interested in getting their "low bands ticket" (general licence or higher). They can learn what different bands are like, how QSOs go, etc. I will be loaning out one of my fix-it radios to a friend for that purpose. If you wanted to make it have better ears, you could make a preamp for it. It covers a wider swath of the radio spectrum than many general coverage receivers do. If you have room for it, maybe make it a decoration in the house? That's what we did with a telegraph key and "clicker" that goes with it. It was on a nice wooden base and we put it inside a glass case. Donald KX8K ---------------------------------------------------- Some ham radio groups you may be interested in: /g/ICOM /g/Ham-Antennas/g/HamRadioHelp /g/Baofeng/g/CHIRP
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Vintage National Speaker FS
Vintage National Speaker For Sale:
This speaker is a National speaker, with the
National logo on it. It apparently was made
to go with the NC-100 receiver, but I am sure
could be used with others as well.
I have seen pictures of this speaker with HRO
receivers as well as the NC-100.
Apparently it was made in 1936.
The speaker itself is a nice Rola 10 inch speaker,
so it has exceptional fidelity. The case is
lined with some sort of special sound material,
which is still in extremely good shape.
The speaker metal case measures 12 x 11 x 8.4
and weighs 12 1/2 pounds. The weight gives you
an idea of the quality of the speaker magnet!
The condition of this particular speaker is
outstanding. Pristine. I can not find a
defect of any sort. No scratches, dents,
or dings. Maybe a very tiny bit of dust.
All four feet are present and are in great
condition.
Buy this terrific speaker for $150 plus
shipping from Florida.
Pick up near Ocala is encouraged.
Thanks.
73,
Ken, W8EK
Ken Simpson
E-mail to W8EK@... or W8EK@...
Voice Phone (352) 732-8400
.
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Vintage National NC-46 TS Speaker FS
Vintage National Speaker For Sale:
This speaker is a National speaker, with the
National logo on it. It apparently was made
to go with the NC-46 receiver, but I am sure
could be used with others as well. I think the
model number of the speaker is NC-46-TS.
It matches the NC-46 chrome base.
I have seen pictures of this speaker with HRO
receivers as well as other National receivers.
The case is lined with some sort of special
sound material, somewhat "waffle like" which
is still in extremely good shape.
The speaker metal case measures 9 H x 10-7/16 W
x 7-1/2 D and weighs about 8 pounds. The
weight gives you an idea of the quality!
The condition of this particular speaker is
outstanding. Pristine. I can not find a
defect of any sort. No scratches, dents,
or dings. Maybe a very tiny bit of dust.
All four feet are present and are in great
condition.
Buy this terrific speaker for $150 plus
shipping from Florida.
Thanks.
73,
Ken, W8EK
Ken Simpson
E-mail to W8EK@... or W8EK@...
Voice Phone (352) 732-8400
.
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Re: National NCL-2000 amp
Doug - I just saw this post and you may already have a solution. If not, then you could use a triac to switch the ac relay and a PNP transistor to switch the triac. The transistor would be turned on by pulling the base to negative through the open collector output of your transceiver. You would need to make a simple dc supply powered from the 13.8 vac supply in the amplifier. All of the new components could probably be mounted in the amplifier. Let me know if you want to pursue this.
Jack, KO?T?
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Re: National NCL-2000 amp
Hello Jack, Thanks for your input.
I’ve got two NCL-2000’s.
For one I bought “Radio Dan’s” kit of an external keying box with a design similar to what you suggest. It works fine and presents a keying voltage of about 3 volts with just a few milliamps to the transceiver. For the other amp I simply installed in series with the relay a diode, current limiting resistor and a small filter cap. The keying voltage is now about 19 volts DC, although I’m sure with a lot of ripple. Nevertheless it seems to work fine with my Ten-Tec Jupiter which uses an open collector keying circuit.
73, Doug/WA1TUT?
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On Dec 13, 2022, at 9:39 AM, KO0T Jack Werthman via groups.io <jwerthman@...> wrote:
?Doug - I just saw this post and you may already have a solution. If not, then you could use a triac to switch the ac relay and a PNP transistor to switch the triac. The transistor would be turned on by pulling the base to negative through the open collector output of your transceiver. You would need to make a simple dc supply powered from the 13.8 vac supply in the amplifier. All of the new components could probably be mounted in the amplifier. Let me know if you want to pursue this.
Jack, KO?T?
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Robert Kembel
