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Date
Re: SR-500

 

Thanks Walt,
Much appreciated, I’ll have a read.?

Vy 73
Chris
G1rpo
Re: SR 150

 

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I have not seen any documentation on the swap-out.

I also have not done the mod. I would imagine the mod to the 400 is pretty much plug and play the 150 and 400 use the same input and output tuning coils.?

The 2000 however has a different output loading coil. That could cause some problems. Just be aware, it may not be plug and play in the 2000.?

Perhaps someone on the forum has done the mod on the 2000 and will jump in.


Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.


From: [email protected] <[email protected]> on behalf of Sam <samcosgrove1@...>
Sent: Monday, April 1, 2024 2:53 PM
To: [email protected] <[email protected]>
Subject: Re: [HallicraftersRadios] SR 150
?
Is there anything written on how to swap the FL1 and crystals?
TNX - WS4AM

Re: SR 150

 

Is there anything written on how to swap the FL1 and crystals?
TNX - WS4AM
HT-37 FS Dayton Pickup

 

5 inch New In Box JAN CNU-5CPI?? O Scope tube in EICO Box. Used in lots of old scopes including Heath

Acopian 28 Volt PS R28W7AH Uninterruptible PS??? Big

Neg 48 Volt PS Conversion System Equip Corp, probably telephone equip

I plan on attending Dayton Zenia and if anyone is interested, I will bring the stuff

$ 100 takes all of above

Also have a Working Hallicrafters HT 37 with cable if anyone interested
Also SX 100 and SX 96, Working

Wally? KC9INK
Re: Crystal testing and frequency measurement

 

Hi Don,
I don't know anything about old Xtal testers.? My crystal tester is a 2N3904, a few capacitors and resistors, and a $13 frequency counter module similar to what ebay offers in response to the search term "Frequency Measurement Module".? It's about 2 days old.?
In-radio frequency is always different from in-tester frequency.? In most cases, the difference is less than 3 kHz, but it could be a little more if the circuit is configured for series resonance and the tester is for parallel. Application circuits generally have an adjustable inductor or capacitor to fine tune the oscillation frequency.? My tester doesn't.
It can also be a lot different!? Most crystals marked in the 30s, 40s, and 50s of MHz oscillate near 1/3 of their marked frequency in the tester.? This doesn't surprise me because it's common for "overtone" crystals to be used at these frequencies.? What surprised me was one crystal marked in the 20s of MHz that oscillated near 3* the marked frequency.? Some crystals in the 1 and 2 MHz ranges oscillate near 3 times the marked frequency in the tester, too.
I wasn't aware of ham radio in the 60s, but in the late 70s, the notion of a VFO with the stability of a crystal sounded really cool.? I tried to build a frequency synthesizer for use with my Johnson Ultracom I had converted to 2m use.? Nowadays, for some reason, I want TCXO-like stability.? But not for the HT-37, HT-44, SR-150, or SX-117.? Maybe for the HT-40 some day.
Cheers,
Halden
HT-37 CW fall time <1mS

 

I have a HT-37 on the bench that is complete from recap and alignment.?
But I have noticed the fall time on CW is nearly zero; it's well under 1
mS.? Before I start tracking this down and looking for a way to stretch
that fall time, I wanted to see if maybe someone else had encountered
and resolved this same issue.

Appreciate any advice or suggestions.

--
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
Re: Crystal testing and frequency measurement

 

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Halden, you are perhaps replying to posts by me and then Jim.

You have answered some of my lingering questions ..thank you!

It seems to me that old Xtal testers were meant to see it is any good at all.. activity, but I suppose now they also have? frequency readouts to many digits.? Since you have been into these, have you found that the “in radio” frequency is the same as the “in your tester” frequency?

Back in the 1960 era before we had all this accuracy we could not measure it, so it hardly mattered, but now this stuff can be measured, so we wonder ..? about things like Walt’s suggestion.

?

From: [email protected] [mailto:[email protected]] On Behalf Of HF via groups.io
Sent: Sunday, March 31, 2024 6:12 PM
To: [email protected]
Subject: [HallicraftersRadios] Crystal testing and frequency measurement

?

This is a continuation of a side-topic from the "SR2000 initial power up" thread.

I use a crystal tester for 2 purposes: 1 is to find the approximate frequency at which the crystal will probably oscillate in an application circuit.? 2 is to provide a reference when experimenting with the crystal itself.? Does baking a crystal affect its resonant frequency?? How far did it move when I added some ink to its surface?
My frequency counter's time base is far more accurate than needed for the current project.? At 16 MHz, it's giving a count that's less than 10 Hz away from my more-accurate way of measuring frequency.
Which is... my Drake R8B receiver that I've outfitted with a TCXO for its reference oscillator.? I set it to USB mode, tune 500 Hz below where I expect the frequency is, and run a scrap of wire from its antenna jack to about 10 cm away from the oscillator I wish to measure.? Spectrum Lab runs on my laptop next to the R8B.? It shows the frequency of the beat tone.? I add that to the R8B's dial setting to obtain the frequency I'm listening to.? Nowadays, the WWV carrier comes in a few Hz away from where I expect it.? When I start to care for more accuracy, I tweak the TCXO's voltage control input.
I find the receiver to be a more convenient instrument for measuring an oscillator's frequency.? I don't have to hold a probe, and I don't have to consider whether the presence of the probe is perturbing the oscillator.? It does have its drawbacks, though.? I might be measuring a spur, not the strongest oscillation, and not know it.? Also, I have to know within about 5 kHz of where the frequency will be; tuning slowly over a larger range than this is more tedious than hooking up the frequency counter probe.
If I ever need sub-Hz accuracy on the frequency counter or the receiver, I'll rig up a rubidium oscillator via a CY22801 to provide the time base needed.
My present goal with regards to the SX-117 is to get all my crystal oscillators running within 500 Hz of where they ought to be.? I don't see any purpose of getting them any better than the range of VFO drift.? Fortunately, there are trimmers in the radio that can pull them up or down at least that much.? The 1.7 and 1.6 MHz BFO oscillators don't have trimmers but they're now at?1600013 and 1699979 respectively according to the R8B. ? It seems that one compensates for drift in these by setting the BFO frequency.
Cheers,
Halden VE7UTS

_._,_._,_


--
don??? va3drl
Re: SR 2000 serial numbers

 

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I have no clue what the 507 means. I need to clarify, the group in Texas purchased the Name, Pattens and all remaining assets. They were legally Hallicrafters. It went on to a group in Florida and then bankruptcy or something like that. You can buy it from the Florida state court if you like.


Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.


From: [email protected] <[email protected]> on behalf of HF via groups.io <incorridge@...>
Sent: Sunday, March 31, 2024 5:17 PM
To: [email protected] <[email protected]>
Subject: Re: [HallicraftersRadios] SR 2000 serial numbers
?
Hi Walt,
My SR-150 has a chassis stamp of "507".? It looks like it might have had more digits after that, but probably not before.? Does this mean the chassis was built by some other company, maybe the one in Texas, and Hallicrafters finished it?
Halden VE7UTS

Re: SR 2000 serial numbers

 

Hi Walt,
My SR-150 has a chassis stamp of "507".? It looks like it might have had more digits after that, but probably not before.? Does this mean the chassis was built by some other company, maybe the one in Texas, and Hallicrafters finished it?
Halden VE7UTS
Crystal testing and frequency measurement

 

This is a continuation of a side-topic from the "SR2000 initial power up" thread.

I use a crystal tester for 2 purposes: 1 is to find the approximate frequency at which the crystal will probably oscillate in an application circuit.? 2 is to provide a reference when experimenting with the crystal itself.? Does baking a crystal affect its resonant frequency?? How far did it move when I added some ink to its surface?
My frequency counter's time base is far more accurate than needed for the current project.? At 16 MHz, it's giving a count that's less than 10 Hz away from my more-accurate way of measuring frequency.
Which is... my Drake R8B receiver that I've outfitted with a TCXO for its reference oscillator.? I set it to USB mode, tune 500 Hz below where I expect the frequency is, and run a scrap of wire from its antenna jack to about 10 cm away from the oscillator I wish to measure.? Spectrum Lab runs on my laptop next to the R8B.? It shows the frequency of the beat tone.? I add that to the R8B's dial setting to obtain the frequency I'm listening to.? Nowadays, the WWV carrier comes in a few Hz away from where I expect it.? When I start to care for more accuracy, I tweak the TCXO's voltage control input.
I find the receiver to be a more convenient instrument for measuring an oscillator's frequency.? I don't have to hold a probe, and I don't have to consider whether the presence of the probe is perturbing the oscillator.? It does have its drawbacks, though.? I might be measuring a spur, not the strongest oscillation, and not know it.? Also, I have to know within about 5 kHz of where the frequency will be; tuning slowly over a larger range than this is more tedious than hooking up the frequency counter probe.
If I ever need sub-Hz accuracy on the frequency counter or the receiver, I'll rig up a rubidium oscillator via a CY22801 to provide the time base needed.
My present goal with regards to the SX-117 is to get all my crystal oscillators running within 500 Hz of where they ought to be.? I don't see any purpose of getting them any better than the range of VFO drift.? Fortunately, there are trimmers in the radio that can pull them up or down at least that much.? The 1.7 and 1.6 MHz BFO oscillators don't have trimmers but they're now at?1600013 and 1699979 respectively according to the R8B. ? It seems that one compensates for drift in these by setting the BFO frequency.
Cheers,
Halden VE7UTS
Re: SR2000 initial power up

 

Hi Jim,
"I would not rely on a crystal tester to read an exact crystal frequency. "
Nor would I.? What matters is whether the crystal oscillates at the desired frequency when installed in the desired circuit.? I use the crystal tester for 2 purposes: 1 is to find the approximate frequency at which the crystal will probably oscillate in an application circuit.? 2 is to provide a reference when experimenting with the crystal itself.? In this case, I used the tester for purpose 2 to determine whether the baking I did at Peter's suggestion made a useful change in the crystal's resonant frequency.? The change was barely useful and far less than I had wished for.
I'll launch a new thread for discussing crystal testing, accuracy, etc.? I don't want to divert this thread too far from its original topic for too long.
Cheers,
Halden VE7UTS
Re: SR2000 initial power up

 


Comments in RED
Regards,
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


On Sunday, March 31, 2024 at 04:13:21 PM CDT, don Root <drootofallevil@...> wrote:


Well guys, you started something I know little about so a question or two...

What is the “standard circuit” than defines how to establish a crystals frequency to the nth degree of precision ?? There is none, AFAIK

If the Q of? a crystal is less than a gazillion, won’t it get pulled by the rest of the circuit it is in while it is being activated?? Perhaps

At what point of accuracy does the wire spacing to the crystal become critical.? Parasitic components always have an effect.

When they originally specified these crystals what precision was expected?? CR-18 spec, +/- 0.005%

A crystal that is going “on air” probably needs to be accurate, but the inaccuracy of one that is used for heterodyning and display on an analog scale might be swamped by the inaccuracy of the readout system, so when does it really matter?? A question I cannot answer.? Some analog receivers can be read to better then 300 cycles when calibrated to the nearest calibrator harmonic, most cannot.

Just gotta know!

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Sunday, March 31, 2024 4:15 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SR2000 initial power up

?

Ok, but the problem still exist with the frequency counter time base.? It must have an minimum frequency accuracy of at least 10 times better then the crystal frequency accuracy that you are trying to measure.? Better then one cycle per megacycle accuracy would be nice.? This would mean that the frequency counter time base should be in an oven and powered for a few days before use.??

?

The OSC5A2B02 10 MHz oven controlled crystal oscillator with a stability of +/- 200 ppb per MHz (0.2 cycle per megacycle) can be had for less then $6, including shipping, on eBay from the friendly folks in China.? It runs off of 5 volts @ 200 mA and can be wired so that it is always on for stable operation when you need it.

Regards,

Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

?

On Sunday, March 31, 2024 at 02:09:00 PM CDT, waltcates <cateswa@...> wrote:

?

?

Halden,

?

OR, you could connect a frequency counter to TP1 and check all the crystals in operation in the circuit.

?

?

Walt Cates, WD0GOF

?

A majority of acceptance is not proof of correctness.

?

From: [email protected] <[email protected]> on behalf of Jim Whartenby via groups.io <old_radio@...>
Sent: Sunday, March 31, 2024 1:39 PM
To: [email protected] <[email protected]>
Subject: Re: [HallicraftersRadios] SR2000 initial power up

?

Halden

I would not rely on a crystal tester to read an exact crystal frequency.? The tester circuit itself will influence the crystal frequency.? As you describe it, the crystal is within 0.066% of marked frequency when in the tester.? So the crystal is certainly good but I would not trust the exact frequency you measured.? Can you receive WWV in your location?

?

Another source of error is the frequency counter's time base.? Any error in the time base will add to the frequency uncertainty.? My Philips frequency counter has an auxiliary time base input.? ?I use a 10 MHz Rubidium oscillator

Regards,

Jim

?

?

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

?

On Sunday, March 31, 2024 at 05:20:08 AM CDT, HF via groups.io <incorridge@...> wrote:

?

?

Well, my SX-117's original 16.000 MHz crystal was at 15.989420 MHz? on my crystal tester (2N3904 circuit).? While testing some of my other crystals, I found another labelled 16.000 which was at 15.994056 MHz.? Today, I put them both in the oven at temperatures varying between 260 and 400F (mostly around 350 F) for 3 hours.? Yep, the solder holding the case together seems to have melted on one of them.? I'm happy that both crystals still work.? I'm not so pleased with the improvement.? The original came up about 70 Hz.? The newly-found one came up about 200 Hz.? The newly-found one is now in the radio.? I'm able to trim it up to about 15.998.650 MHz and WWV comes in about where it should.
I'll check them again after a while to see if they reverted.
Cheers,
Halden VE7UTS
Re: SR2000 initial power up

 

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Well guys, you started something I know little about so a question or two...

What is the “standard circuit” than defines how to establish a crystals frequency to the nth degree of precision ?

If the Q of? a crystal is less than a gazillion, won’t it get pulled by the rest of the circuit it is in while it is being activated?

At what point of accuracy does the wire spacing to the crystal become critical.

When they originally specified these crystals what precision was expected?

A crystal that is going “on air” probably needs to be accurate, but the inaccuracy of one that is used for heterodyning ?and display on an analog scale might be ?swamped by the ?inaccuracy?? of the readout system, so when does it really matter?

Just gotta know!

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Sunday, March 31, 2024 4:15 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SR2000 initial power up

?

Ok, but the problem still exist with the frequency counter time base.? It must have an minimum frequency accuracy of at least 10 times better then the crystal frequency accuracy that you are trying to measure.? Better then one cycle per megacycle accuracy would be nice.? This would mean that the frequency counter time base should be in an oven and powered for a few days before use.??

?

The OSC5A2B02 10 MHz oven controlled crystal oscillator with a stability of +/- 200 ppb per MHz (0.2 cycle per megacycle) can be had for less then $6, including shipping, on eBay from the friendly folks in China.? It runs off of 5 volts @ 200 mA and can be wired so that it is always on for stable operation when you need it.

Regards,

Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

?

On Sunday, March 31, 2024 at 02:09:00 PM CDT, waltcates <cateswa@...> wrote:

?

?

Halden,

?

OR, you could connect a frequency counter to TP1 and check all the crystals in operation in the circuit.

?

?

Walt Cates, WD0GOF

?

A majority of acceptance is not proof of correctness.

?

From: [email protected] <[email protected]> on behalf of Jim Whartenby via groups.io <old_radio@...>
Sent: Sunday, March 31, 2024 1:39 PM
To: [email protected] <[email protected]>
Subject: Re: [HallicraftersRadios] SR2000 initial power up

?

Halden

I would not rely on a crystal tester to read an exact crystal frequency.? The tester circuit itself will influence the crystal frequency.? As you describe it, the crystal is within 0.066% of marked frequency when in the tester.? So the crystal is certainly good but I would not trust the exact frequency you measured.? Can you receive WWV in your location?

?

Another source of error is the frequency counter's time base.? Any error in the time base will add to the frequency uncertainty.? My Philips frequency counter has an auxiliary time base input.? ?I use a 10 MHz Rubidium oscillator

Regards,

Jim

?

?

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

?

On Sunday, March 31, 2024 at 05:20:08 AM CDT, HF via groups.io <incorridge@...> wrote:

?

?

Well, my SX-117's original 16.000 MHz crystal was at 15.989420 MHz? on my crystal tester (2N3904 circuit).? While testing some of my other crystals, I found another labelled 16.000 which was at 15.994056 MHz.? Today, I put them both in the oven at temperatures varying between 260 and 400F (mostly around 350 F) for 3 hours.? Yep, the solder holding the case together seems to have melted on one of them.? I'm happy that both crystals still work.? I'm not so pleased with the improvement.? The original came up about 70 Hz.? The newly-found one came up about 200 Hz.? The newly-found one is now in the radio.? I'm able to trim it up to about 15.998.650 MHz and WWV comes in about where it should.
I'll check them again after a while to see if they reverted.
Cheers,
Halden VE7UTS

_._,_._,_


--
don??? va3drl
Re: SR2000 initial power up

 

Ok, but the problem still exist with the frequency counter time base.? It must have an minimum frequency accuracy of at least 10 times better then the crystal frequency accuracy that you are trying to measure.? Better then one cycle per megacycle accuracy would be nice.? This would mean that the frequency counter time base should be in an oven and powered for a few days before use.??

The OSC5A2B02 10 MHz oven controlled crystal oscillator with a stability of +/- 200 ppb per MHz (0.2 cycle per megacycle) can be had for less then $6, including shipping, on eBay from the friendly folks in China.? It runs off of 5 volts @ 200 mA and can be wired so that it is always on for stable operation when you need it.
Regards,
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


On Sunday, March 31, 2024 at 02:09:00 PM CDT, waltcates <cateswa@...> wrote:


Halden,

OR, you could connect a frequency counter to TP1 and check all the crystals in operation in the circuit.


Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.




















				
					
					

					




From: [email protected] <[email protected]> on behalf of Jim Whartenby via groups.io <old_radio@...>

Sent: Sunday, March 31, 2024 1:39 PM

To: [email protected] <[email protected]>

Subject: Re: [HallicraftersRadios] SR2000 initial power up

?










Halden


I would not rely on a crystal tester to read an exact crystal frequency.? The tester circuit itself will influence the crystal frequency.? As you describe it, the crystal is within 0.066% of marked frequency when in the tester.?
 So the crystal is certainly good but I would not trust the exact frequency you measured.? Can you receive WWV in your location?







Another source of error is the frequency counter's time base.? Any error in the time base will add to the frequency uncertainty.? My Philips frequency counter has an auxiliary time base input.? ?I use a 10 MHz Rubidium oscillator


Regards,


Jim



















Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


























On Sunday, March 31, 2024 at 05:20:08 AM CDT, HF via groups.io <incorridge@...> wrote:



















Well, my SX-117's original 16.000 MHz crystal was at 15.989420 MHz? on my crystal tester (2N3904 circuit).? While testing some of my other crystals, I found another labelled 16.000 which was at 15.994056 MHz.? Today, I put them both in the oven at temperatures
 varying between 260 and 400F (mostly around 350 F) for 3 hours.? Yep, the solder holding the case together seems to have melted on one of them.? I'm happy that both crystals still work.? I'm not so pleased with the improvement.? The original came up about
 70 Hz.? The newly-found one came up about 200 Hz.? The newly-found one is now in the radio.? I'm able to trim it up to about 15.998.650 MHz and WWV comes in about where it should.


I'll check them again after a while to see if they reverted.

Cheers,

Halden VE7UTS





















            
        

					


				
				
				
			

			
			

	

	
			

			

				
					

				
				
			

			

				

					

				

			

			
			
			

			


				
	



		
			
		
			
				
	
		
	

		
			

			
			

			
			
				
				

					

						
							
							

							Re: SR2000 initial power up
							
						
					

				

				

			
			

				

					


						
							

								
								
							

						
					

					

						
							


						
						 
						
							
							
						
						
					

				

			

			

			

				








开云体育



Halden,









OR, you could connect a frequency counter to TP1 and check all the crystals in operation in the circuit.



















Walt Cates, WD0GOF



?


A majority of acceptance is not proof of correctness.




















				
					
					

					




From: [email protected] <[email protected]> on behalf of Jim Whartenby via groups.io <old_radio@...>

Sent: Sunday, March 31, 2024 1:39 PM

To: [email protected] <[email protected]>

Subject: Re: [HallicraftersRadios] SR2000 initial power up

?










Halden


I would not rely on a crystal tester to read an exact crystal frequency.? The tester circuit itself will influence the crystal frequency.? As you describe it, the crystal is within 0.066% of marked frequency when in the tester.?
 So the crystal is certainly good but I would not trust the exact frequency you measured.? Can you receive WWV in your location?







Another source of error is the frequency counter's time base.? Any error in the time base will add to the frequency uncertainty.? My Philips frequency counter has an auxiliary time base input.? ?I use a 10 MHz Rubidium oscillator


Regards,


Jim



















Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


























On Sunday, March 31, 2024 at 05:20:08 AM CDT, HF via groups.io <incorridge@...> wrote:



















Well, my SX-117's original 16.000 MHz crystal was at 15.989420 MHz? on my crystal tester (2N3904 circuit).? While testing some of my other crystals, I found another labelled 16.000 which was at 15.994056 MHz.? Today, I put them both in the oven at temperatures
 varying between 260 and 400F (mostly around 350 F) for 3 hours.? Yep, the solder holding the case together seems to have melted on one of them.? I'm happy that both crystals still work.? I'm not so pleased with the improvement.? The original came up about
 70 Hz.? The newly-found one came up about 200 Hz.? The newly-found one is now in the radio.? I'm able to trim it up to about 15.998.650 MHz and WWV comes in about where it should.


I'll check them again after a while to see if they reverted.

Cheers,

Halden VE7UTS



















					


				
				
				
			

			
			

	

	
			

			

				
					

				
				
			

			

				

					

				

			

			
			
			

			


				
	



		
			
		
			
				
	
		
	

		
			

			
			

			
			
				
				

					

						
							
							

							Re: SR2000 initial power up
							
						
					

				

				

			
			

				

					


						
							

								
								
							

						
					

					

						
							


						
						 
						
							
							
						
						
					

				

			

			

			

				
Halden
I would not rely on a crystal tester to read an exact crystal frequency.? The tester circuit itself will influence the crystal frequency.? As you describe it, the crystal is within 0.066% of marked frequency when in the tester.? So the crystal is certainly good but I would not trust the exact frequency you measured.? Can you receive WWV in your location?

Another source of error is the frequency counter's time base.? Any error in the time base will add to the frequency uncertainty.? My Philips frequency counter has an auxiliary time base input.? ?I use a 10 MHz Rubidium oscillator
Regards,
Jim


Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

        



        
        

            

                
                

                        On Sunday, March 31, 2024 at 05:20:08 AM CDT, HF via groups.io <incorridge@...> wrote:
                    

                    


                    


                
                
                
Well, my SX-117's original 16.000 MHz crystal was at 15.989420 MHz? on my crystal tester (2N3904 circuit).? While testing some of my other crystals, I found another labelled 16.000 which was at 15.994056 MHz.? Today, I put them both in the oven at temperatures varying between 260 and 400F (mostly around 350 F) for 3 hours.? Yep, the solder holding the case together seems to have melted on one of them.? I'm happy that both crystals still work.? I'm not so pleased with the improvement.? The original came up about 70 Hz.? The newly-found one came up about 200 Hz.? The newly-found one is now in the radio.? I'm able to trim it up to about 15.998.650 MHz and WWV comes in about where it should. 
I'll check them again after a while to see if they reverted.
Cheers,
Halden VE7UTS







            

        

				
				
				
			

			
			

	

	
			

			

				
					

				
				
			

			

				

					

				

			

			
			
			

			


				
	



		
			
		
			
				
	
		
	

		
			

			
			

			
			
				
				

					

						
							
							

							Re: Listing electronic items (exotic tubes)
							
						
					

				

				

			
			

				

					


						
							

								
								
							

						
					

					

						
							


						
						 
						
							
							
						
						
					

				

			

			

			

				
You are correct Mike, thanks for the correction. ?My memory isn’t what it used to be. ?hihi
73,
-- 
Paul
NV6B

				
				
				
			

			
			

	

	
			

			

				
					

				
				
			

			

				

					

				

			

			
			
			

			


				
	



		
			
		
			
				
	
		
	

		
			

			
			

			
			
				
				

					

						
							
							

							Re: SR-500
							
						
					

				

				

			
			

				

					


						
							

								
								
							

						
					

					

						
							


						
						 
						
							
							
						
						
					

				

			

			

			

				








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The SR-500 is an upgraded version?of the SR-160. The difference is?in the PA and the power supply. The 160 is a 100 watt output radio. The 500 is a 300 watt radio.









For more?information see:







and





















Walt Cates, WD0GOF



?


A majority of acceptance is not proof of correctness.


















				
					
					

					




From: [email protected] <[email protected]> on behalf of Onewatt via groups.io <c.reed662@...>

Sent: Sunday, March 31, 2024 7:18 AM

To: [email protected] <[email protected]>

Subject: [HallicraftersRadios] SR-500

?






Hi All,

where does the SR-500 tx/rx fit into the Hallicrafters line up as there doesn’t seem to be much info out there. ?


Vy 73

Chris

G1rpo







					


				
				
				
			

			
			

	

	
			

			

				
					

				
				
			

			

				

					

				

			

			
			
			

			


				
	



		
			
		
			
				
	
		
	

		
			

			
			

			
			
				
				

					

						
							
							

							Re: SR 2000 serial numbers
							
						
					

				

				

			
			

				

					


						
							

								
								
							

						
					

					

						
							


						
						 
						
							
							
						
						
					

				

			

			

			

				








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OR, it could be one of the "TEXAS RADIOS". When Northrup/Wilcox fulfilled all the Hallicrafters government contracts they sold the Name and remaining property to a group in Texas. In the property were in process and completed chassis for SR, SX and HT systems.
 They completed the build and on the radios. Then they sold them at ham fests and ham forums across the country. No paper serial tag and no glue residue where the serial tag should be is a clue.



















Walt Cates, WD0GOF



?


A majority of acceptance is not proof of correctness.




















				
					
					

					




From: [email protected] <[email protected]> on behalf of James Chaggaris <jimc@...>

Sent: Saturday, March 30, 2024 9:45 PM

To: [email protected] <[email protected]>

Subject: Re: [HallicraftersRadios] SR 2000 serial numbers

?




The only who will know is Jim Liles (K9AXN). ?I will call him tomorrow. ?Dave, your SR2000 doesn’t exist.

?


Best Regards,

Jim Chaggaris


PowerOne Corp.


Cell 630.669.2241
















					


				
				
				
			

			
			

	

	
			

			

				
					

				
				
			

			

				

					

				

			

			
			
			

			


				
	



		
			
		
			
				
	
		
	

		
			

			
			

			
			
				
				

					

						
							
							

							Re: SR 2000 serial numbers
							
						
					

				

				

			
			

				

					


						
							

								
								
							

						
					

					

						
							


						
						 
						
							
							
						
						
					

				

			

			

			

				
I tend to agree with Walt – that the date stamped chassis was probably made on the indicated date but the actual assembly and final check out of a Hallicrafter radio could be later – sometimes much later. This assumption is generally in agreement with the run of serial numbers which were presumably added shortly after final assembly and appear to be sequential.


See the informative and in-depth internet article by Henry Rodgers WA7YBS on the SX-28 at  . He states all the Hallicrafters production history was destroyed when the company was bought out by Wilcox Instruments in the early 1970s. Particularly interesting are his sections on dating the various versions. Also note his serial number log for the various versions of the SX-28.


What is confusing is the serial numbers for a given Hallicrafter model do not always have a consistent serial number pattern which often varies between the model versions. For example the SX-28s serial numbers used either an H or HA prefix but do seem to be sequential to a certain extent. Also note his discussion on serial numbers and production runs. He states “The production run method is certainly how most companies did handle their build schedules, especially when their production was not to specific orders and the company produced more than one type of product. As more serial numbers are collected the picture of how Hallicrafters handled their production schedules might become clearer.”


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