Re: SR2000 Cant Null carrier
I cleaned and tightened everything including the bracket. No change. I drilled the rivets and removed the old Trimmer. It was bad. It reads nothing on my LCR. New trimmer reads 4 to 26 pf.? Rated at
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W7WRX
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#29804
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Re: HT-32 filters
My planned fix for this is to add an analog filter between the mic and the rig to roll off aggressively above 3 Khz.? Improving it at RF level would involve far more work where cooking up an active
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Jeff AC0C
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#29803
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Edited
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Re: Sx100 question on 50.5 kc alignment
Use an attenuator (-10 or -20db) if the signal is too large. The emphasis is on peaking the signal to a maximum level, rather than adjusting to 1 volt PP.I'd use a banana to BNC adapter with a 50 ohm
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KN6WFM (Drew)
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#29802
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Re: HT-32 filters
This makes sense. A friend has the 32A, I have listed and watched its signal for years on scope. It's always been super wide and always had some buckshot. I assumed it was modified. C
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W7WRX
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#29801
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Edited
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Re: HT-32 filters
It does not make a material impact on the transmitted bandwidth in my testing.? I certainly would be interested to see if someone else has looked at the transmit bandwidth on their units.? Maybe
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Jeff AC0C
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#29800
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Re: HT-32 filters
CR2 is the passband filter. Its adjustment is C121. Walt Cates, WD0GOF https://wd0gof.com/Hallicrafters A majority of acceptance is not proof of correctness.
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waltcates
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#29799
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Edited
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Re: Sx100 question on 50.5 kc alignment
This is the probe I am using
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Keith
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#29798
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Re: Sx100 question on 50.5 kc alignment
Drew I am coming straight out of the IG5282 into the IF. Using an alligator clip to tap at pin one on T1 and the other to chassis ground.
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Keith
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#29797
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Re: Sx100 question on 50.5 kc alignment
I do have a RF probe. One that I made plus one that is a manufactured version. I am changing the connection on my VTVM from the 1/4 inch jack to a bnc this evening. That will help also. The commercial
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Keith
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#29796
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Re: HT-32 filters
That's true Walt.? But if you sweep these filters, they don't provide passband attenuation on the transmitted sideband.? They do a fine job on the carrier and the opposite sideband, but don't do
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Jeff AC0C
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#29795
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Edited
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Re: HT-32 filters
The 32 actually has 3 filters CR2, FL1 and FL2 [cid:ae9544c5-6c02-4452-b49a-d494f6225549] [cid:251a5965-ccbb-4b54-9b47-75f0dde711ca] Walt Cates, WD0GOF https://wd0gof.com/Hallicrafters A majority of
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waltcates
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#29794
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Edited
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Re: SR2000 Cant Null carrier
Thanks Jim. I will check that. I fail to see how this could make a trimmer cap not work. There is a carrier on both side bands of about 2w. I can kick the Carrier osc around and null the carrier which
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W7WRX
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#29793
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Re: SR2000 Cant Null carrier
Hi Dave, I'm fairly certain the capacitor is not the problem.? The rivets holding the function switch have loosened or oxidized from switching.? There is one black wire to ground that was to protect
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James Liles
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#29792
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Re: SR 150
The HT-32 has no BPF in the classic sense.? Just some L/C type providing a pretty gentle roll off. 73/jeff/ac0c alpha-charlie-zero-charlie www.ac0c.com
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Jeff AC0C
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#29791
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Re: SR 150
The Drake TR-4 came with 2.1 kHz filters.? I replaced them in mine with the aftermarket Inrad 2.5kHz filters. Not only do I get much better reports on the air but the receive fidelity is a LOT easier
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Rick W7IMM
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#29790
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Re: Sx100 question on 50.5 kc alignment
Keith, It seems to me you are going to need an RF probe on your VTVM to measure 1 volt RF. You can easily build your own single diode probe. Look on the internet for a simple circuit. 73 Scott N6CIC
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T. Scott Griffin <scottandalene@...>
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#29789
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Re: SR2000 Cant Null carrier
The mount is insulated so rivets dont ground the cap.. The cap is not adjusting the circuit.? They are known to fail. I put a drop of dexoit on it last night as a last resort. It did not fix it this
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W7WRX
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#29788
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Re: Sx100 question on 50.5 kc alignment
You and me both, Keith-Drew Sent from AT&T Yahoo Mail on Android On Mon, Apr 1, 2024 at 7:07 PM, Keith<kd4avp@...> wrote: Ok that makes more sense to me now. AGC was off.? I will drop the
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KN6WFM (Drew)
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#29787
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Re: Sx100 question on 50.5 kc alignment
I'm getting close to doING the same on my SX-100. So I'm interested in knowing your outcome.What is the peak to peak measurement of your input signal and is it 50 ohm terminated? And, what about your
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KN6WFM (Drew)
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#29786
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Re: Sx100 question on 50.5 kc alignment
Guess this old dog is not too old to keep learning. Definitely not what my work background has been. Just always had an interest in radios and hate to see these beautiful receivers just go to a junk
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Keith
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#29785
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