Re: S-85: how are the RF amplifier tube (v1) and the MIX/OSC tube (v2) coupled in band1?
Hi Jim , and all; revising numbering makes it tough to compare things !!!! So the Halli C62 function remains despite our communication inability. I guess that it one reason I often take a snip of what
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don Root
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#31910
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Re: S-85: how are the RF amplifier tube (v1) and the MIX/OSC tube (v2) coupled in band1?
Maynard FYI S-40 [no suffix] https://bama.edebris.com/download/hallicra/s40techman/s40techman.djvu This seems to have no C62 and looks like ¡°your¡± 40A at first glance ..SO maybe you have an early
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don Root
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#31909
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Re: S-85: how are the RF amplifier tube (v1) and the MIX/OSC tube (v2) coupled in band1?
The S-40B Photofact Folder that I copied calls it C7 but it is still a 2.2 pF cap just as is C62.? Sam's has a format that they follow so their component designations are not the same as
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Jim Whartenby
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#31908
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Re: S-85: how are the RF amplifier tube (v1) and the MIX/OSC tube (v2) coupled in band1?
Maynard, yes wording is tough. ¡°C62¡± had been started.. then it moved To me it showed that it was thought to be needed for a simple coil, but not for a transformer .. A version Then when the B
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don Root
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#31907
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Re: S-85: how are the RF amplifier tube (v1) and the MIX/OSC tube (v2) coupled in band1?
And my S-40A schematic is from Sam's Photofacts (via the Web) and it doesn't have C62 as in your schematic nor does it use independent designation of each component, but labels them with numbers
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Maynard Wright
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#31906
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Re: S-85: how are the RF amplifier tube (v1) and the MIX/OSC tube (v2) coupled in band1?
Hi, Don, When I said that there is no C62 equivalent in the S-40A, I meant that there is no capacitor like C62 that is connected around the switching and resonant circuits so that it is completely
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Maynard Wright
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#31905
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Re: S-85: how are the RF amplifier tube (v1) and the MIX/OSC tube (v2) coupled in band1?
Maynard on the S-40A, C62 is in use on band 2 only but connects V1 and V2 like in the B version ¡I think. We need somebody to LRC a sample switch. Sent: Thursday, February 27, 2025 11:16 AM To:
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don Root
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#31904
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Re: S-85: how are the RF amplifier tube (v1) and the MIX/OSC tube (v2) coupled in band1?
Note that the S-40A uses an entirely different arrangement of coils and capacitors and has no equivalent to C62 in the S-40B. So why is the S-40B equipped with C62? Maybe switch S1B in the S-85
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Maynard Wright
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#31903
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Re: For Sale - Hallicrafters R-274/FRR with speaker
Dwight, I like that counterweighted roof setup. I've never seen anything like that. It gives you great low angle viewing! The roof on my primary observatory is motorized so it tracks on rails but the
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Tom Smith
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#31902
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Re: S-85: how are the RF amplifier tube (v1) and the MIX/OSC tube (v2) coupled in band1?
Emanuele Yes, I prefer to look at R26 and C29 as the plate load Impedance, so the V1 output voltage is developed thru it, and as you reiterated there is no V1-V2 obvious intended coupling in band 1,
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don Root
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#31901
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Re: For Sale - Hallicrafters R-274/FRR with speaker
Nice looking setup.? I love New Mexico for the landscape.? You don't see this on the east coast. My step-son lives in Houston. We have driven there a couple of times and know it is a long trip. We
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dwight_talley
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#31900
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S-85: how are the RF amplifier tube (v1) and the MIX/OSC tube (v2) coupled in band1?
This topic raised in the "TRIMCAPs don't peak" thread. I think it's worth its own thread. Here it is. In the S-85 there is no obvious coupling between the RF amplifier tube (v1) and the MIX/OSC tube
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Emanuele Girlando
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#31899
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Re: For Sale - Hallicrafters R-274/FRR with speaker
Hi Dwight, I've attached a few pics of the Pie Town setup. Actually, it's two sites. One is a rolltop with a connected warm room. The other is a hill top site with a typical dome and an incredible
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Tom Smith
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#31898
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Re: For Sale - Hallicrafters R-274/FRR with speaker
Hey Dwight, Thanks for the email. FB on your Rio Rancho observatory. As you might guess, I¡¯m not up there every weekend for several reasons. It¡¯s a 17 hour drive one way for me from Houston.
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Tom Smith
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#31897
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Re: SR-150 and SR-160 QRO modifications
Rick W7IMM, If you would please contact me offline. 73/Randy WN9D
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wn9d
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#31896
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Re: For Sale - Hallicrafters R-274/FRR with speaker
Hey Tom.? I had an observatory in Rio Rancho for a while.? I would love to see your setup.? My wife and I went to Pie Town once and they did not have any pies.? WTF!!! Let me know when you are
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dwight_talley
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#31895
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Re: SR-150 and SR-160 QRO modifications
For several years during the 1970s my only rig was a Heath HW-7 running 3 watts with which I worked over 30 states on 40 CW using an attic dipole. Lots of fun. You can't work everyone you hear with
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Maynard Wright
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#31894
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Re: SR-150 and SR-160 QRO modifications
That Dummy is not so dumb?
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don Root
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#31893
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Re: SR-150 and SR-160 QRO modifications
Last year I turned the rig on and the band sounded in really poor shape but there was a station calling CQ and I answered and worked him. Afterwards I realized why the band was quiet. I was on the
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Don VE3IDS
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#31892
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Re: SR-150 and SR-160 QRO modifications
And for proof of the power theory (fact) I just completed a cw Q to Wake Island over the weekend accidentally driving my Acom 1500 which was till tuned for 15M while having the K4 set for 100W drive
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edward schumacher
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#31891
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