EMRFD Message Archive 12880
Message Date From Subject 12880 2016-05-29 13:11:12 skipp025 Help IDing a Ham Radio Magazine DigiRatt PLL 2 PC board project re: Help IDing a Ham Radio Magazine DigiRatt PLL 2 PC board project
Hello to the Group,
Pulled from a local Amateur related flea market box of stuff...
I found a nearly un-built PC board... there are some labels on the board
indicating it was made from a project printed in Ham Radio Magazine.
The other available PCB label states "DIGIRATT" AND "PLL 2". One of
the PCB solder eyelets states "AUDIO" and the output appears to be a
TO-220 transistor, possibly used to key a DC output ... RTTY current
With no chips in the sockets... I guessing the input leading to a 14 pin
IC is an audio op-amp. Two trailing 8 pin dips are probably tone detectors
like the 567. There are four TTL chips over on the other side near the output,
one being a 7404, a 7400 and two unknowns...
Any chance anyone on here might know which specific HR Magazine article
this board was made for? I tried to search the on-line archives with no hits/
results on DIGIRATT or PLL2, so this is step 2.
Thank you in advance for your replies...
skipp025 at yahoo dot com
12881 2016-05-29 14:06:51 Vern Re: Help IDing a Ham Radio Magazine DigiRatt PLL 2 PC board project Hi Skipp,Try 73 Magazine, September 1982...73,Vern - N7GTBKennewick, WASent via the Samsung Galaxy S®6 active, an AT&T 4G LTE smartphone-------- Original message -------- 12882 2016-05-29 14:20:47 Vern VanZ Re: Help IDing a Ham Radio Magazine DigiRatt PLL 2 PC board project ...my apologies, turns out what I found was a project BASED on the DIGIRATT... You were correct Skipp...it appears to have been from Ham Radio Mag, Sept. 1977, pg 26.-V. 12883 2016-05-29 15:17:32 Dennis Czelusniak Re: Help IDing a Ham Radio Magazine DigiRatt PLL 2 PC board project A search turned this up likitysplit: >>> http://www.seekic.com/circuit_diagram/communication_circuit/afsk_with_pll.html <<<
Hope it helps!
12884 2016-05-29 17:16:57 skipp025 Re: Help IDing a Ham Radio Magazine DigiRatt PLL 2 PC board project Hello everyone, thank you for your quick answers to my DigiRatt PLL2
article request. Turns out it's one of a series of similar articles and updates
by the author. The PLL2 version article is dated October 1978 and I have
a PC board for it. Anyone remember Circuit Board Specialists... even
FAR Circuits for project PC Boards? Fred at FAR Circuits is doing well,
I just bought some stuff from his Hamvention Store/Tent.
Again, thanks everyone
12885 2016-05-29 17:20:06 skipp025 Re: Help IDing a Ham Radio Magazine DigiRatt PLL 2 PC board project Hi Vern,
Turns out the required article for my board is from Oct 1978. And I'm
sure 73 Magazine offered a lot of very similar projects. I have archive
copies of both HR and 73 Magazine... have enjoyed reading those
publications for many decades. Some of the older projects are still
quite fun and useful to build.
So again thank you to everyone and now to use the board toward