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Re: wanting sx 99 knobs
开云体育Look further down the messages here.? I think this was already discussed.? As an alternative, try this site. ?
? They have lots of replacement knobs and you might find some very close. ? K2WH ? ? From: HallicraftersRadios@... [mailto:HallicraftersRadios@...] On Behalf Of Gary
Sent: Monday, May 23, 2005 5:42 AM To: HallicraftersRadios@... Subject: [HallicraftersRadios] wanting sx 99 knobs ? i am curently trying to restore a couple of sx99's? and they have |
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SX-117 New Issue?????
开云体育While I just posted the SX-117 restoration has gone well with the BFO adjustments, a new and puzzling item has reared its head. ? The selectivity control, which is connected to the 2nd conversion 50 kHz IF section, is affecting the received (observed) “S” meter level.? That is, in the 5 kHz setting, I get a certain “S” meter indication, in the 2.5 kHz setting I get higher readings and in the .5 kHz setting, I get even higher “S” meter readings.? All on the same signal. ? Looking at? the schematic, I do not see how narrowing the selectivity of the receiver at the 2nd IF level would affect the “S” meter readings in the 1st IF section where the “S” meter is connected!? While it matters little to me what the received signal strength is, I am left wondering why this would happen as I see no direct correlation between the 1st and 2nd IF operation that would affect the “S” meter. ? K2WH ? ?
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Re: SX-117 Knobs
开云体育Further to this, I should add, that new or current bottles of “White Out”, no longer use a brush for application, they have a triangular shapes wedge as the applicator.? Sort of looks like a very small triangular sponge. ? K2WH ? From: HallicraftersRadios@... [mailto:HallicraftersRadios@...] On Behalf Of Dale
Sent: Saturday, May 21, 2005 10:24 PM To: HallicraftersRadios@... Subject: [HallicraftersRadios] Re: SX-117 Knobs ? I've done something similar with old instrument knobs.? I first
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Continuing SX-117 Alignment and Repair Story
开云体育Well, I think I finally got it.? At the suggestion of others, a fresh look or adjustment of the BFO circuit was needed. This seems to be the most critical adjustment one can make on an SX-117.? Anyway, adjusting the BFO frequency only slightly, (not even 1 hz), solved the problem with inverted USB & LSB problem.? The crystals are in the correct sockets and all seems. ? I replaced the 2 wire line cord with a 3 wire.? This required some chassis mods but it came out nice.? The mod included the reaming out of the AC line access hole for a larger cord and strain relief.? Thank GOD, the chassis is aluminum so it turned out to be a piece of cake. ? At this point, I am waiting for a replacement 500k volume control which is very bad and not fixable through spraying and most importantly, the HT-44 transmitter and matching PS-150-120 power supply I recently acquired.? I also have the HA-10 LF converter which is an accessory for the SX-117. ? This will be a nice setup when done. ? K2WH ?
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Re: Anyone know "Fix it Fox" on Ebay?
I never heard of him but I and I am sure others would like to know
about this vendor. Any answers to this question? Bill, K2WH --- In HallicraftersRadios@..., "Ed Hatcher" <eh_54@y...> wrote: This person sells knob inserts for various makes of equipment? |
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Re: S-38C antenna
开云体育I cannot answer that question.? If you don’t already have one, your best bet is to get a service manual for the receiver.? You can get them from various sources such as radioreprints.? Do a google search.? I do not know if you are setup with test equipment but you may want to think about getting some of the basics if you are into restoring? these old radios.? I too get all my tubes from the same company and I have found some of the tubes not up to par.? Don’t assume because they are in a box, they are good.? Unless you tell them to test them prior to delivery, it’s pot luck.? One of the first items I got was an old tube checker of which many are found on Ebay.? It took (3) tries to get the one I needed.? If you order any tubes from any vendors, tell them to check them first.? It costs a little more but it is worth it.? In the meantime, go get the manual if you don’t already have one.? Good luck with it. ? Bill K2WH ? From:
HallicraftersRadios@...
[mailto:HallicraftersRadios@...] On
Behalf Of tuberadioguy ? --- In HallicraftersRadios@..., Bill Gerhold
wrote: > For a receiver such as the S-38, almost any long wire, straight or looped > will work fine.? I would just put up as much > > wire as possible and go from there.? If you are experiencing overloading, > then I would check the receiver AVC circuit > Perhaps it is not functioning correctly.? Have you checked the tubes? > >? > > K2WH > Thanks for the tip. It has all NOS tubes from Antique Electronics Supply that arrived on Saturday!? What would be the expected (approximate) range of the AVC voltage measured on the 12SA7 converter tube with a) no antenna and b) a fairly strong local AM station? Am I looking for a range of 1/2 volt or so or several volts difference between conditions a) and b)?? I wish I had another similar radio here to compare with mine. Thanks again >? > >?? _____? > > From: HallicraftersRadios@... > [mailto:HallicraftersRadios@...] On Behalf Of Tom Zyniecki > Sent: Friday, May 20, 2005 9:04 AM > To: HallicraftersRadios@... > Subject: [HallicraftersRadios] Re: S-38C antenna > >? > > Hi I use a slinky antenna home made but like the antennas sold on > ebay. Its hanging on a hook on my shop door. I do not think I have > $5 invested. A pece of wire a push on connector to fit the slinky > and some pvc pipe to insulate the ends. >??????????????????? Tom > > > --- In HallicraftersRadios@..., "tuberadioguy" > wrote: > > I'm new to the group and I'm just wondering what kinds of > > antennas (length, electrical arrangement) people have used > > with a Hallicrafters radio such as the S38 type (or similar). > > > > Has anyone used a loop antenna with a model such as the S38? > > > > A previous owner an S38 radio suggested an untuned long wire > antenna, > > but a 40 ft length of wire seemed to cause a lot of overloading > > on mine. > > > > Also, AM is quite noisy (probably local noise) below 800 kHz with > > a long wire. > > > > I'm interested in details like lengths and / or electrical > > arrangements (dipole,sloper, etc.) that have been used. > >?? > > I'd welcome hearing anyone's shortwave and AM listening? > experiences > > with a S38 model. > > > > > > Thanks > >? > > Tuberadioguy > > > > > This site is dedicated to the free and open exchange of ideas, advice, > technical and general information about Hallicrafters transmitters, > receivers, home entertainment equipment, and all other Hallicrafters > products. And more importantly, this site is dedicated to the large number > of fans, cheerleaders and users of this wonderful equipment which utilized > the technology of vacuum tubes. > > Hallicrafters equipment was on the front lines (literally) during the early > years with military communications radios. On the home front with shortwave > receivers, amateur transmitters and home entertainment equipment. Truly an > American company. > > K2WH (Your Moderator) > > > > >?? _____? > > Yahoo! Groups Links > > *????? To visit your group on the web, go to: > >?? > *????? To unsubscribe from this group, send an email to: > HallicraftersRadios-unsubscribe@... > > >?? > *????? Your use of Yahoo! Groups is subject to the Yahoo! > <>? Terms of Service. This site is dedicated to the free and open exchange of ideas, advice, technical and general information about Hallicrafters transmitters, receivers, home entertainment equipment, and all other Hallicrafters products. And more importantly, this site is dedicated to the large number of fans, cheerleaders and users of this wonderful equipment which utilized the technology of vacuum tubes. Hallicrafters equipment was on the front lines (literally) during the early years with military communications radios. On the home front with shortwave receivers, amateur transmitters and home entertainment equipment. Truly an American company. K2WH (Your Moderator) |
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SX-117 Knobs
Still working on the SX-117 receiver. This is probably known by many old
radio restoration experts but I tried this idea with the knobs and it came out quite well and I thought I would pass it along. The knobs on the SX-117 and similar series radios, all have a white reference line running the length of the knob from panel to the front of the knob. On my SX-117 (probably used a lot), most of the white line has been worn off. What I did was to take each knob individually, put it in a small padded vise (to hold it steady) and using blue masking tape (blue leaves no residue), I masked off the knob areas to only show this straight worn out line. I then used a bottle of "White Out" to restore the line. White out dries very quickly and after removing the tape, the knobs look perfect for the most part and the white seems to stay put. K2WH |
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Re: S-38C antenna
开云体育For a receiver such as the S-38, almost any long wire, straight or looped will work fine.? I would just put up as much wire as possible and go from there.? If you are experiencing overloading, then I would check the receiver AVC circuit. Perhaps it is not functioning correctly.? Have you checked the tubes? ? K2WH ? From: HallicraftersRadios@...
[mailto:HallicraftersRadios@...] On
Behalf Of Tom Zyniecki ? Hi I use a slinky antenna home made but like the antennas sold on |
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SX-117 Alignment and Strange Happenings
Just performed a complete alignment of the SX-117 and all went well
with better performance. Having the proper equipment to perform the alignment is of great help of course. Anyway, before the alignment, and after this alignment, I still have inverted USB and LSB. That is, in the LSB switch postion, I actually receive USB and in USB I receive in LSB. I swapped the (2) crystals, 1.600khz and 1.700 khz, and all is fine. However, the sockets the crystal go in are labeled the other way. In other words, to get the USB/LSB correct, I switched the crystal into the opposing sockets. The 1600khz crystal in the 1.700khz socket and so forth. I checked the crystal frequencies and they are exactly on frequency. Checking the USB/LSB switching, the correct crystal is being selected. Now I have a delima where I have physically reversed the crystals into the incorrect sockets, but the receiver works. Anyone with ideas of what is going on here? Is it possible Hallicrafters labeled the socket incorrectly or put the socket in backwards. Could someone have rewired the switch to socket connection. K2WH |
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SX-117 USB/LSB Reception Problem Solved
Solved the USB/LSB switching problem in my SX-117. As I guessed, the BFO
was out of alignment but not a heck of a lot and I needed to get it back to its center frequency of 50 khz. The manual states the BFO frequency is set at exactly (their words) 50 khz. Looking at the schematic, I determined I could connect my 756pro test rig through a coupling cap and find out where the BFO was on the spectrum scope. I found it at 48.6 khz. I unlocked the BFO control, and carefully rotated the slug till I had exactly a 50khz blip on the scope. At that point I locked down the BFO (mechanically) and tried the receiver again. It now acts like a true SSB receiver in that I can no longer receive USB and LSB in any mode SSB position. USB is now USB and LSB is now LSB on the mode switch. One thing is puzzling to me however. The manual says to "not use the BFO to tune in signals", and "it is set at the factory at exactly 50 khz". Why then oh why, would Hallicrafters bring the BFO frequency control out the front panel so you can change the frequency? Other rigs let you adjust the BFO level or just turn it on or off but they don't provide a control to change the BFO frequency. My SX-111 just has an on/off BFO switch. My SX-17 has a BFO level control. Most rigs just have BFO on or off. Why Hallicrafters brought out the control, I cannot answer but, I think maybe this BFO control, the ability to change frequency, was a precursor to the "IF Shift" control found on many of today's rigs. What do you think? K2WH |
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SX-117 Problem
Hi guys, working on my sx-117 and encountered a strange problem and want to
pass it by the crowd. I was having trouble receiving signals until I realized the BFO control was turned all the way to the right. Rotating the control all the way to the left, brought the receiver back to life. AM works great but SSB has a problem. The sound of SSB sounded similar to an IF shift control being turned to far to one side (tinny). Reading the alignment procedure for the BFO, I followed it exactly. It states, put the receiver in USB, put on the 100kc calibrator and tune to almost zero beat. Switch to LSB and the beat note should not change appreciably. Well, when I switched sidebands, the zero beat was out of there. Going further in the book, I followed the "Major" BFO adjustment procedure and the receiver came back beautifully. Nice signals good reception, AM and SSB but, here is the perplexing problem. I can set the rig to LSB, and tune in a LSB signal. Switching to USB, results in the signal moving 1khz in one direction or the other (crystals). This is normal. However, I can retune the same LSB signal and understand the signal as though the receiver was still in LSB even though the receiver is in USB mode! Basically, it does not seem to matter if the receiver is in LSB or USB, I can still make any SSB signal regardless of their sideband, intelligible. I believe it is a BFO thing. I think it is out of adjustment and inserting carrier when it should not. Sort of like an older receiver without a product detector. With a BFO, it did not matter what sideband the transmitting station was on, you could always tune it in. Any ideas out there would be greatly appreciated. Bill K2WH |
Bill (Group Owner)