After discussion between the SVHFS Board of Directors and the 2020 Conference Committee, it was decided that the 2020 conference will be canceled and not rescheduled this year. The next SVHFS conferen

Because of the health and safety concern of our society members and the uncertainty of time of our National Emergency caused by the Corona virus pandemic, the Society’s Board of Directors elected to p

SVHFS Conference 2020 Registration...The Clock Is Ticking Pre-registration is open through April 15, 2020. Please use the registration form on the conference web page here. The 2020 Southeastern VHF S

SVHFS Conference 2020 Registration & Call For Papers The 2020 Southeastern VHF Society Conference will be held in Gainesville, Georgia on April 24-25, 2020. Gainesville, GA is approximately 60 miles n

The 2020 Southeastern VHF Society Conference will be held in Gainesville, Georgia on April 24-25, 2020. Gainesville, GA is approximately 60 miles north of Atlanta in EM84ch. It is about 1.5 miles from

I found that the USB to serial adapter from SparkFun was the ticket to easy programming on the ProgRock. Any terminal program will provide the communications. https://www.sparkfun.com/products/12731 T

Great news..at least as far as working on frequency...I've finally had/taken time to build the QLG1 kit & connect it to my ProgRock. Once the QLG1 locked on GPS satellites & the 1PPS started, the Prog

#progrock

Great news..at least as far as working on frequency...I've finally had/taken time to build the QLG1 kit & connect it to my ProgRock. Once the QLG1 locked on GPS satellites & the 1PPS started, the Prog

#progrock

Sid, Alan, Is it easy enough for you to check the value of register 2 in your ProgRocks when they're on frequency, and then again when they're off frequency by whatever error you're seeing? I'm findin

#progrock

Hi Sid, If you read back through the email chain you'll find Hans' statement concerning 1Hz./µS latency; that's how I became informed of the factor. He did say variable latency which certainly would b

#progrock

Hans & the group, An update: Exchanging the RC values on the 555 has shown that the 555 latency isn't causing the frequency error I'm experiencing. I'm now in the region of 400nS latency at the 555 st

#progrock

Hi Hans, The inverter & level shifter are the same stage..a simple 2N3904. The shifter is needed to bring the 2.8V logic 1PPS from the GPS to 5V logic level, and the coincidence is that it's inverted

#progrock

Hi Floyd, Yes, most certainly. That's the value of these email groups. I've benefited many times by this sort of participation in other groups and value the follow up very highly. Thanks, Robin Midget

#progrock

Hi Hans, Do you mean like this? :>) This morning the error at 16.686600 MHz was 14 Hz. In other words, I set register 8 to 16,686,614 to obtain a measured output of 16,686,600. Doubling that output fr

#progrock

Hi Hans, Thanks for the response. I'd really like to understand what's causing this issue & what to do about it. Presently I have the Trimble GPS 1PPS 2.8V logic 1mS pulse driving a level shifter to a

#progrock

Hi Graham & the group, The issue Sid & I and possibly others who aren't reading the mail on this subject isn't about stability with the TCXO or OCXO. The stability with those optional oscillators is w

#progrock

Hi Hans, I've taken your very good recommendations into account & still no joy. Please see my reply in message # 36114. Thanks, Robin Midgett K4IDC

Hello Sid & the group, Sid, you're not alone. I can't seem to get my ProgRock to be stable with GPS discipline. It is far more stable & accurate without GPS discipline; I have the standard issue cryst

#progrock

Yes indeed. Given that the LPF kits require the builder to wind the toroids and the ease of replacing or supplementing the fixed value caps with narrow value trimmers, it seems that a tuneable LPF cou

Thank you. That certainly explains why my ProgRock is on an Australian walkabout without a 1PPS signal...even a sub 4 volt 1 PPS! Lovin' the learning! Thanks, Robin Midgett K4IDC