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Re: Boonton 250-A RX meter
?? About my phone number, I am in the book but I am so deaf its a struggle for me on the phone.
By Richard Knoppow · #109420 ·
Re: Boonton 250-A RX meter
?? I just went out and looked. I couldn't get the hex plug out of the detector side but did on the bridge side. Inside I can see the end of a coil former. The slug has a hex or allen socket. So a
By Richard Knoppow · #109419 ·
Re: Boonton 250-A RX meter
I have the oscillator assembly removed from the panel and the threaded plug removed from the front.? I cannot see any adjustment through that hole.? The access is limited because the hole is
By Bob Albert <bob91343@...> · #109418 ·
Re: Boonton 250-A RX meter
?? If you have had that side of the oscillator box open you can see the turret. Two turrets coupled. The coils have slugs with screw adjustments on the side you can't reach and slots on the other
By Richard Knoppow · #109417 ·
Re: HP 3455A repair and capacitor question.
I started with the test points for voltage. Also the 10 volt reference was low at 9.2 and -9.1 volts. They also came back to 10.0 and -10.0. The Peak ESR meter really came thru. Also about a week ago,
By Rob Naulty · #109416 ·
Re: Duplexer tuning with ESA-L1500A spec-an/tracking gen
Casey, Several ideas:? Set the attenuator to 0dB manually.? Turn on the internal preamp if equipped, or add a preamp externally.? Set the attenuator to 0dB manually.? Add a modest power capability
By John Gord · #109415 ·
Re: Boonton 250-A RX meter
Okay I have made some progress.? I removed the top panel, the frequency control knobs, and the screws holding the front panel.? I then removed the screws holding the oscillator assembly to the
By Bob Albert <bob91343@...> · #109414 ·
Re: HP8656B attenuation problem
Why not disconnect the attenuaor and run any other known signal through it and use the 8656 to control the atenuator setting. Cheers! Bruce Quoting "Syd via groups.io"
By Bruce · #109413 ·
Re: Boonton 250-A RX meter
Richard, while I have not cleaned the turret contacts (they seem solid), I have had the side cover off a couple of times.? I will see about removing the knobs.? At least I don't have to remove the
By Bob Albert <bob91343@...> · #109412 ·
Re: HP 3455A repair and capacitor question.
I doubt that it will make a significant difference.? Having said that, I wish it were that easy to fix my 3455A.? It worked well until one day it stopped.? Please guide me toward a
By Bob Albert <bob91343@...> · #109411 ·
HP8656B attenuation problem
Right now I can kind off get this thing to work if I put in a massive amplitude offset of about 20 dBm. But that changes when I enter in the amplitude as mV. Since I'm working on a messed up output
By Syd · #109410 ·
Re: Boonton 250-A RX meter
?? I need to look at the remains of my RX meter to be sure I give you the right instructions but the slugs are accessible via a hole in the front of the oscillator assembly which is covered by an
By Richard Knoppow · #109409 ·
HP 3455A repair and capacitor question.
I have a 3455A that I have been using, and recently it stopped working and throwing the Cal Constant #12. After finding my 30 Volt test point low and TP 14 low, I found capacitor C57 bad with my Peak
By Rob Naulty · #109408 ·
Re: Duplexer tuning with ESA-L1500A spec-an/tracking gen
Yes, 1k.
By Casey Crane · #109407 ·
Re: Duplexer tuning with ESA-L1500A spec-an/tracking gen
Are you using the narrowest available RBW it's capable of? Ed
By Ed Breya · #109406 ·
Re: Boonton 250-A RX meter
Look in the files section.? There are two copies zipped with different utilities. I am still at a loss how to gain access to the alignment adjustments for the detector local oscillator.? It appears
By Bob Albert <bob91343@...> · #109405 ·
Re: E4406A Input Attenuator
Hello, I have replaced the input switch on a E4406A by a MGS-71018 but I got the same problems as described on Youtube in the different steps of a E4406A repair
By f1ghb · #109404 ·
Re: Duplexer tuning with ESA-L1500A spec-an/tracking gen
I have never used your specific instrument, or on that duplexer type that you mention. But in my expedience of tuning conventional duplexers with a tracking generator, once the notch can no longer be
By Alex · #109403 ·
Re: CLIP/Schematics for E4403-60042 Tracking Gen
Hi Sandra, I had exactly the same error messages with my E4407, and it turned out that all the FETs were Ok, but one of the 4 pin diodes in the “LO PIN Modulator” was open. This pin modulator is
By Juergen · #109402 ·
Duplexer tuning with ESA-L1500A spec-an/tracking gen
I have an ESA-L1500A with the tracking generator installed. I am trying to tune an oddball hybrid ring type of Sinclair R101 lowband duplexer to 6 meters. I can only see down to about -80db. Is there
By Casey Crane · #109401 ·