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Re: R4C rough tuning
I agree with everything Peter has listed except that I use mineral spirits for the ball bearings and their race.? I will add that you won¡¯t get the PTO to be as light and smooth as the earlier designs but you can come close ¡ª especially with the ¡°metal gears¡± version (there are still one or two nylon gears in a ¡°metal gears¡± PTO).? Be very careful to put any nylon washers back where they originally were. The locations and thicknesses of these washers can vary ¡ª they were used to fine-tune the geartrain.? 73, Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from for iOS On Wed, Dec 18, 2024 at 23:10, VE7PS via groups.io <ve7ps@...> wrote:
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Re: R4C rough tuning
Jay; There are many reasons that can contribute to "grabbing" or "sticky" tuning on the C-line dials.? Often there can be more than one reason.? Full teardown is always my choice but I understand that can be?a daunting task to face for the 1st time.?? Before doing that I would recommend?reading and studying two articles. Both are on WB4HFN's website. The first is by Neil, K1VY; The 2nd is by me, and can be found here; It starts on Page 15. If pulling the PTO seems a bit much, you could try cleaning out the front bearing with long Q-tips and rubbing alcohol.? You will need at least a half?dozen swabs to get it clean.? Once clean, re-lube with a light grease.? I prefer copper infused moly grease these days, but have used white lithium in the past.? Both work well for me.? Unfortunately?one often finds burrs on the 1/4" steel PTO shaft, or on the brass busing it slides into, as well as old stiff grease on the PTO gears. Full disassembly is required to address these issues. I cannot stress enough to take a picture at EVERY step of the removal process.? You won't regret it afterwards.? There are four different mechanical styles I have documented produced during the C-line run....and despite having disassembled at least 30 of those now, I can still get easily confused when trying to get them back together again. Pictures?REALLY help! Good luck! 73 Peter VE7PS On Wed, Dec 18, 2024 at 7:11?PM Evan via <k9sqg=[email protected]> wrote:
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Re: R4C rough tuning
My guess is that the vernier drive has a lubricant that has hardened over the years. ? Same could be true of the PTO screw. ?Let's hear what the experts say...
On Wednesday, December 18, 2024 at 10:07:53 PM EST, Jay W6CJ via groups.io <lastradioman@...> wrote:
Group,
In an R4C the PTO is electronically stable but that 'silky smooth' tuning is not happening.? It takes extra force to tune the PTO (as compared to my T4XC) and feels like something grabbing or resisting. Without pulling all of the gears apart, where should I start looking for what's grabbing? Thanks & 73 Jay W6CJ |
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R4C rough tuning
Group, In an R4C the PTO is electronically stable but that 'silky smooth' tuning is not happening.? It takes extra force to tune the PTO (as compared to my T4XC) and feels like something grabbing or resisting. Without pulling all of the gears apart, where should I start looking for what's grabbing? Thanks & 73 Jay W6CJ |
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Re: Twins PTO. Compatability
The Twins are all interchangeable ¡ª except for the R-4, which uses a 6AU6 mounted on the chassis.? Of course, there will be different implementations of dials amongst the three major types but you can use a C Line PTO in an R-4A, R-4B, T-4X or T-4XB (in addition to the C Line).? Note that the Twin PTO¡¯s do not interchange with any of the TR-4¡¯s. All TR-4 versions will interchange with each other. The TR-3 also has a 6AU6 active element, like the R-4 and isn¡¯t interchangeable with the TR-4.? 73, Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from for iOS On Wed, Dec 18, 2024 at 19:16, Steve WA8ZMC via groups.io <wpe8jvi@...> wrote:
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R4C/T4XC new op questions
Group, My twins came back from being worked on by Ron, WB4HFN.? While on a HW-16 budget 50 years ago, I coveted these rigs and thought it would be cool to try them after a slight delay.? Had my first QSO with K6GVG on 40CW today. The questions: 1.? Are there clearer driver and PA tuning instructions than those in the T4XC e-copy manual??? 2.? Is there a way to lower that 850 Hz CW sidetone volume? 3.? Is there a way to turn down the volume of my transmitted CW signal in the R4C when operating both RX and TX; using my TX signal as the sidetone? 4.? Seems to me a good way to operate CW is using both radios; spotting my transmit signal on the station that I wish to contact, then using the receiver as a BFO...? Thanks & 73 Jay W6CJ |
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Re: L4B Chimney size (K7CBR, VE7RF, WB6KBL)
Joseph K7CBR
The new blower moves over twice the air of the factory blower through the same sk406 chimney. I did the direct comparison using a hand held anemometer... held at the same location and distance above the outlet of the SK-406 chimney. I forgot now what the original velocity and CFM values vs. new ones were/are. I measured this to avoid any confirmation bias. It was nice to see Jim (VE7RF) confirming my findings. As I stated a long time ago, it is not enough to have one person just say it/measure it. Even though I was careful to do empirical measurement. Tuesday, December 10, 2024 at 11:33:34 AM EST, Richard Knoppow via groups.io <1oldlens1@...> wrote: ? ? ? Does changing the idle current affect the distortion? If this is the grid bias with no drive it is the operating point of the amplifier. If I understand what you are doing correctly (and I may well not be) the bias establishes the operating point of the amplifier so increasing bias toward cut off, i.e. more negative, moves the amplifier toward Class B. That would certainly reduce dissipation in the absence of drive. ? ? Another thought: Does not the tapering of the chimney at the top restrict air flow? It should increase velocity at the plate seal but is a constriction so might reduce overall air flow. Maybe there is something here I am not getting. On 12/10/2024 7:46 AM, Jim VE7RF via groups.io wrote: > On Mon, Dec 9, 2024 at 05:17 PM, Joseph K7CBR wrote: > >? ? <Well Senor Jim... I was wondering if you had made the change yet on >? ? the L4B... .. What was the before and after result? Cooling, noise, >? ? and so on... > -- Richard Knoppow Los Angeles WB6KBL SKCC 19998 |
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Re: FS-4 Injection Cable Questions
Thank you, Bob NZ5A
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Show quoted text
On Dec 16, 2024, at 11:07?AM, Lyndon VE7TFX <lyndon@...> wrote: |
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Re: L-4B Blower Wheels
¿ªÔÆÌåÓýI think it is ok as others have made trades here. ?If anyone objects I will move to another venue. ?Vince would you like to text ?me at 423-368-3982 or call. ?Thanks again John
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Re: L-4B Blower Wheels
¿ªÔÆÌåÓýOkay at the risk of getting in trouble with the forum moderator and members what is the protocol for going to this transaction I don¡¯t want to bother them or get in any hot water. I have tested it works like a dream I have pictures I want to send them to you I await your information and then we can consummate the deal. Vince N8 MQV Cleveland ? ? From: [email protected] <[email protected]> On Behalf Of John W4BFS via groups.io
Sent: Monday, December 16, 2024 2:02 PM To: [email protected] Subject: Re: [DRAKE-RADIO] L-4B Blower Wheels ? Hi Vince. ?I would like to buy it if it is in good condition as I have an L4 rf deck without a blower. ?Is $40 plus shipping interesting? ? Thanks 73 John
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Re: L-4B Blower Wheels
¿ªÔÆÌåÓýI will look for the box, give it a quick test and send you a few pics so that you are sure of what is offered.? V ? From: [email protected] <[email protected]> On Behalf Of John W4BFS via groups.io
Sent: Monday, December 16, 2024 2:02 PM To: [email protected] Subject: Re: [DRAKE-RADIO] L-4B Blower Wheels ? Hi Vince. ?I would like to buy it if it is in good condition as I have an L4 rf deck without a blower. ?Is $40 plus shipping interesting? ? Thanks 73 John
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Re: L-4B Blower Wheels
¿ªÔÆÌåÓýHi Vince. ?I would like to buy it if it is in good condition as I have an L4 rf deck without a blower. ?Is $40 plus shipping interesting? ? Thanks 73 John
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Re: L-4B Blower Wheels
¿ªÔÆÌåÓýI am late to this thread apparently there is discussion about L4B and similar blower wheels slash assemblies I have an original L4B blower complete I believe the blower wheel is an excellent or perfect shape I will have to dig it out and look at it. If anyone has an interest in buying it make me an offer thank you Vince N8MQV ? From: [email protected] <[email protected]> On Behalf Of Phil WX9US via groups.io
Sent: Monday, December 16, 2024 8:22 AM To: [email protected] Subject: Re: [DRAKE-RADIO] L-4B Blower Wheels ? Whoops, misspoke. The blower wheel is no longer produced by Torrington but Mark found a very close replacement. He may not be converting the wheels at this time but I just wanted to get an update on where to get the wheels and if the existing wheels had worked out for those that had bought them? 'No need to re-invent the wheel' hihi, if it's out there already. |
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Re: L-4B Blower Wheels
Whoops, misspoke. The blower wheel is no longer produced by Torrington but Mark found a very close replacement. He may not be converting the wheels at this time but I just wanted to get an update on where to get the wheels and if the existing wheels had worked out for those that had bought them? 'No need to re-invent the wheel' hihi, if it's out there already. |
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Re: L-4B Blower Wheels
Correct, I was trying to get in contact with Mark Huber NO8J to see if he could provide?
where he got the wheels.? He had stated that it was a manufactured by Torrington and was available. Anyone have another email address for him? He's on QRZ but haven't been able to
contact him there? either.
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Jay W6CJ
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