I finally have a coax filter for the MSA I am building. I have a few problems that I hope I can tap the wisdom of the group to solve. I posted a picture of the...
Hi Neal,  First off, you can re-tap the bad thread with a larger screw size. This is not critical. You can use a larger diameter screw and, if you want to,...
Thanks Scotty for the reply. From the comments you made it sounds like I have overcoupling. What would you suggest needs to change to decrease the coupling?...
Hi Neal, Unequal screw lengths would suggest that the center stub is either not centered or of different length. I think you are destined to remove the top...
I got my two LTC5505-2 chips today and now will built the probe using dead-bug / matthan style, then test the plo's on my SA. also I have the final bandpass...
Does anyone know where I could get some RG-141 hard pipe for the cavity filter? The best I've come up with is a Chinese supplier who'll provide ten feet for a...
yep, thats the same stuff I bought, they also have the smaller size too, I got two of each. I just couldn't remember the location, glad you found it bob WB7DMX...
Oh dear, I sent an e mail to the seller asking about shipping cost to Canada, never got a reply, and in the meantime whatever he had has gone. Soooooo, on the...
A 2" long spring, 3/16 OD made out of 22 mil wire, has an ID of .144 mils and is just enough to allow .141 OD harline inside. This makes a perfect bender. You...
In addition, part# 9433K29 (same price), although might be tight, will be good for RG405 (0.091" OD) Jim W1JGH From: spectrumanalyzer@yahoogroups.com ...
Hi Jim, don't know if you have any tracking on the slim filter boards you sent me but I have not received them yet. Thanks for any assistance. 73 Clive G0PPO...
Somebody else from the UK got his a couple of days ago. I understand there was a postal strike that messed things up. The following is the info I have. ...
Thanks for the offer Ken. As it happens someone else is sending me a 12 inch piece of the hardline so I should be OK. But if I mess up the first time I may...
Hi All, The new software, which we will be able to release when we get it documented (explaining the software is as difficult as writing it), has several...
Hi Everybody, I just finished assembling a single board synthesizer which combines Scotty's designs of the master oscillator, DDS and PLL. It has very little...
Hi Juan, Unless I'm reading something wrong, the narrow scans of the PLO output seem to show that the PLL loop bandwidth is very narrow--maybe just a few...
Juan, phase noise measurement are not easy, except You have some sophisticated test instruments like the agilent E5052A (orB) I have one such instruments in...
Thanks Sam and Henning, Sam, from what I understand from your comment, I should increase the loop bandwidth. I'll try that. Henning, thanks for the offer of...
Hi Juan, Actually, your phase noise is closer than you think. It may be within 5 dB of the design goal. I cannot read the values on your schematic but it is...
Juan, To get the noise in dBc per Hz, subtract the noise level from the signal peak, and then add a factor to account for your bandwidth. Add 10*Log(RBW); so...
Hi Scotty, I guess I don't understand the Phase Noise concept very well. I would measure it using the SA by taking the difference in dB observed between the...
We have a couple of volunteers to test some "standards", so we will be able to get more precise results on the accuracy of component measurements made with the...
Good results! (I think) I increased the loop bandwidth and the improvement in phase noise was visible immediately. The phase noise was hiding a lot of spurs...
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