FS: 8 GHz Input C option for PM6680, PM6681 and PM6685 frequency counters - Page 1
Forum section: electronics / general

author: jadew
author_rank: Frequent Contributor
timestamp: August 10, 2019, 04:47:24 am
content: Hey guys,I just started selling these boards on my website:https://cojotech.com/pmo-080A video and installation instructions should be available sometime next week.I made a mistake on the silkscreen (which is not visible in the photo, because I photoshopped it out), so the boards from this batch will have a little sticker where the part number and the serial number is, which will specify the correct part number (this was the mistake).15% off on this batch.Cheers!

author: alm
author_rank: Super Contributor
timestamp: May 10, 2021, 03:55:35 pm
content: I realize this is an old topic, but posting this question on the forum should be more helpful to others than emailing you directly. I'm considering ordering one of these. Why the choice between 20cm and 30cm cable? Surely there will be an optimal length based on the position of the front panel connector and prescaler board? Or is there a difference between the PM6680/6681 and PM6685? I believe the '85 might have the prescaler board in a different position than the other counters.Also, the board should also work with the Pendulum CNT-80/81/85, since as far as I know these are identical to the Fluke/Phillips counters, and were rebranded after Pendulum split off from Fluke (similar to Agilent -> Keysight).

author: srb1954
author_rank: Super Contributor
timestamp: May 10, 2021, 09:40:00 pm
content: Quote from: alm on May 10, 2021, 03:55:35 pmOn the PM6681 a different length of cable required for the front panel or rear panel installation of the channel C connector. I found (with a different after-market prescaler to this one) that the 20cm cable wasn't long enough to reach the front panel but was OK for the rear panel.

author: jadew
author_rank: Frequent Contributor
timestamp: June 11, 2021, 02:39:14 pm
content: Sorry for the late reply, I missed the notification.Indeed, on the PM6681 the 20 cm cable is not long enough. I will give up entirely on the 20 cm cable option as the difference in response between the two is negligible.I also have some new 30 cm cables on order, which will be of higher quality, so once those are here,the choice will be between low cost 30 cm and high quality 30 cm cables. The main difference will be in the build quality and materials.Regarding the Pendulum counters, yes, it should work there as well. It even works in the CNT-90 - had a customer who installed it in one but I think the connector didn't fit quite right and he had to shave two corners of the connector with a file.As I'm writing this, I'm out of all types of cables, but I'll have some of the high quality ones in stock as of next week.Edit: I have completely given up on the low cost cables.

author: ytterligare
author_rank: Regular Contributor
timestamp: June 11, 2021, 09:50:59 pm
content: Hi there, slightly off topic but I wanted to testify that I got from you the 10 Ghz board for the HP 53131A and it is working beautifully, thank you !!Andrea

author: nctnico
author_rank: Super Contributor
timestamp: June 12, 2021, 12:04:21 am
content: Quote from: jadew on June 11, 2021, 02:39:14 pmThat is interesting. I'm wondering if it would also work in the CNT-91 (I have the Tektronix branded version of that counter).

author: jadew
author_rank: Frequent Contributor
timestamp: June 12, 2021, 10:08:24 am
content: Quote from: ytterligare on June 11, 2021, 09:50:59 pmHey Andrea, thanks for the testimonial!I was going to get in touch with you once I received the new 30 cm cables, because there's a connector in that order that might be of interest to you.Quote from: nctnico on June 12, 2021, 12:04:21 amIt will most likely work. I just checked my messages and at least two customers got them for their CNT-90s (edit: and it worked).

author: jemp
author_rank: Contributor
timestamp: August 19, 2024, 08:01:15 am
content: Hi JadewDo you still have some of these boards available ?Tnx for infoJemp

author: coromonadalix
author_rank: Super Contributor
timestamp: August 19, 2024, 02:15:49 pm
content: send him a pm, better chances to get an answer if he doesn't monitor this thread ...

author: DaJMasta
author_rank: Super Contributor
timestamp: August 19, 2024, 05:30:42 pm
content: FYI, I sent an email to them a few weeks back and got this reply:QuoteDon't know what the board was, can't reverse engineer from just the pictures (only the back), but there's certainly some demand for something like it if anyone else wants to take a stab at it.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 20, 2024, 05:47:57 am
content: so far only 3Ghz one's still exists ... at a few places