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MONTHLY REMINDER--Our Amateur Radio Groups
#monthly-notice
MONTHLY REMINDER--Our Amateur Radio Groups Below are our amateur radio related groups. Some may be new enough there are only a few members. If one of those interests you, join it and give it some time to grow. It costs nothing and if there’s few members, it won’t be filling up your inbox while you wait for it to grow. ? Alinco /g/Alinco-Amateur-Radio Antenna Tuners /g/Antenna-Tuners Anytone /g/Anytone-Amateur-Radio Baofeng /g/Baofeng CHIRP radio programming tool /g/CHIRP EF Johnson /g/EFJohnson-Amateur-Radio Ham radio antennas https://ham-antennas.groups.io/g/main Ham Radio Help group https://hamradiohelp.groups.io/g/main Icom /g/ICOM Icom 746 /g/Icom-746 Icom 746 Pro /g/Icom-746Pro Kenwood /g/Kenwood-Amateur-Radio MFJ ham equipment /g/MFJ-Amateur-Radio National /g/National-Amateur-Radio RF Amplifiers https://rf-amplifiers.groups.io/g/main Swan /g/Swan-Amateur-Radio Yaesu FT-757 /g/FT-757GX Yaesu FT-767GX /g/FT-767GX
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Sorry to interrupt the silence....
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... but I have a NC-125 and I am having trouble getting the Pitch Control (BFO) to work. If anyone has one (NC125) I'd ask you to pull the plastic knob & measure the resistance from chassis ground to the brass shaft and report here or email me at w8rmv at arrl dot net. As I look at the construction, it looks like the brass shaft should be at or near ground level. Coil L18 is supposed to be center tapped, but my 125's also has significantly more resistance on one side than the other. Maybe I have a bad L18. Still searching for an answer, as the rest of the NC125 works great! 73 - Bob W8RMV
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NCX-1000 update protective circuitry around 8122 or leave it stock?
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Hi, Anyone modified their NCX-1000 output section to better protect the expensive 8122 tube? Several expert source provide direction how to extend the operating life of the tube and to reduce SSB distortion. Example is the output section described here: HF Circuits for a Homebrew Transceiver By Mark Mandelkern, K5AM QEX magazine NOV/DEC 2001 John VE3PCN
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Hi all. I'm just new to this particular group. I'm finally getting through some of my 40+ year hoard and working on some receivers, and I've uncovered the National pile! Among the hoard are some early HRO's (a Jr. and a Sr.) with a bunch of coil sets, a coil box and some speakers, and an old Navy R-116. I also have a nice National 1-10 VHF receiver, which is the subject of this post and is coming to the top of my take-a-look-at-it list. I'm looking for some help - this set used six coil sets to cover the entire frequency range (six sets of two coils each, labeled A1-A2, B1-B2, C1-C2, D1-D2, E1-E2, and F1-F2). They are small, round coils enclosed in clear "plastic", about 1-5/16" diameter and 1-1/14" tall, each with 5 pins on the bottom. I have the 'B' pair of coils, looking for the rest, or a full set. Note that the ones I have are discolored, no longer clear but sort-of beige, probably from humid storage over the years and as shown in the photos attached. Others out there might look like this too, but I'm not too concerned with appearance. Attachments show the coil pair I have, a photo from the manual showing the coil sets, and a photo of my radio with a coil pair installed. Anyone have any they can part with, or point to a possible source? Any help appreciated - thank you!
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SW-3 Model 1 Version 2
I’m finally getting around to working with my SW-3 receiver (type 36 & 37) and it doesn’t use the normal 4 pin “plug & play” supplies. Looking at the schematic tells me there is 135v and 67v labeled B+ blue and green. There is the 6v filament on two leads with a 5th lead labeled yellow that appears to ground the 67v B+ voltage supply through some supply resistors. It’s labeled B- so I’m assuming it is connected to both negative B+ or is connected to the 135v high side if I’m using a dropping resistor to get my 67v. Does all this sound right or am I headed to a smoke escape event? Thanks, Tom N5AMA
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HRO-500
I just obtained a HRO-500 that is wired for 240v operation. It had been sold to and used by an European owner. The manual describes a power terminal board and how to change the wiring for 120v operation. However the wiring colors in my unit don’t match the wiring colors depicted in the manual. Obviously 4 of the wires must be for the dual transformer primaries. There’s also other wires for the power input, and the switching. Any thoughts as to how to trace this out? Following the wiring thru the tightly laced wiring harness is a nightmare. Doug/WA1TUT
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HRO-60T PLUG IN COILS?
Hello All, Looking for plug in set for HRO-60T. I have found 50T packs for sale, but nothing for a Sixty. Can 50T coils be used in a sixty? Thanks! K5AKM
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HRO-W Coil Packs Question
Coil packs come in bandspread and non-bandspread versions. Can the bandspread coil packs be quickly tuned, in general, and then fine tuned using a bandspread function, or does their use restrict tuning to only very slow (although precise) bandspread tuning while inserted into the radio ? 73, Bill KJ5BNE
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Wanted: Dead Penta Labs 8122 tubes
Hi all, I am looking for one or more dead Penta Labs 8122 tubes. Must be Penta Labs specifically. Bob, K7DYB
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Has anyone figured out a good substitute for the blower motor? I’ve seen suggestions that Grainger might have one but none in their catalog would seem to work. I think the original motor shaft is 3/16” diameter. The Grainger motors of the approximate correct size are all 1/4” shafts. The problem would be fitting the blower wheel. I think it’s 2-3/4”diameter- not readily available. Tnx, Doug/WA1TUT
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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. I think the model number of the speaker is MCS-8. It looks very close to the NC-46 TS but without the chrome base. I have seen pictures of this speaker with HRO receivers as well as other National receivers. Actually, it would be a good match for most any vintage receiver. The speaker metal case measures 9 H x 10 W x 7-1/2 D and weighs over 8 pounds. The weight gives you an idea of the quality of the speaker magnet! The actual speaker itself is labeled PM 8-9-5, which I assume means it is an 8 inch permanent magnet speaker. The condition of this particular speaker is outstanding. All four feet are present and are in great condition. There may be a very tiny bit of dust. Buy this terrific speaker for $135 plus shipping from Florida. I also have many other accessories available such as many different types of microphones, HTs, VHF and UHF rigs, HF and VHF/UHF antennas, connectors, miscellaneous accessories, etc. Just too many to list here. Please e-mail your requests. . Prices do not include shipping from Florida. Thanks. 73, Ken, W8EK Ken Simpson E-mail to W8EK@... or W8EK@... Voice Phone (352) 732-8400 .
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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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National NCL-2000 amp
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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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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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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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NC-98
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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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Selling in the group
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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National 200 Tranceiver
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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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New to Group
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’s Pete N6QW Sent from Mail for Windows
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National NCX 200/500
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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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