I have been attempting to get the remote power on capability of ACOM Director Plus working with the ACOM 600S however no matter what I tried I was unable to make it work. I tried swapping to a null modem cable and amazingly the remote power on worked perfectly, however I could no longer connect to the amp from the computer.
On closer inspection of the manual, it would appear that there is something unusual about the wiring for the RS-232 port
At first glance everything seems fine, however pins 2 & 3 (TxD and RxD) are wired to use a straight through RS-232 cable, but pins 6 & 8 (DSR and CTS used for remote power on) are wired to use a null modem cable. This means that for full control of the amp a custom cable must be used.
What peaked my interest is the fact that pins 4 & 7 are noted as Not Connected, these are the DTR and RTS lines and are what’s used to tell the amp to power on. In order for this to work they must be connected to pins 6 and 8. It occured to me that it should be possible to make a modification to the amp to enable it to support a regular straight through RS-232 cable.
To that end i’ve put together a mod which can be found over at ACOM 600S RS-232 RPON Mod which details how to do this. It’s only useful if you intend to use the RPON capability through the RS-232 port, however it will avoid the need for custom cables and is still backward compatible should a custom cable happen to be used in the future.
IMPORTANT – YOU SHOULD NOT ATTEMPT THIS MODIFICATION UNLESS YOU ARE CERTAIN YOU HAVE THE SKILLS AND EQUIPMENT REQUIRED, YOU COULD DAMAGE YOUR AMPLIFIER. THIS MODIFICATION IS NOT ENDORSED BY ACOM. NO RESPONSIBILITY IS TAKEN BY M0YOM, ACOM OR ANYONE ELSE FOR ANY DAMAGE OR INJURY THAT MAY RESULT FROM PERFORMING THIS MODIFICATION. PERFORMING THIS MODIFICATION WILL LIKELY VOID YOUR WARRANTY.
I was having a bit of a clear out this evening and came across this little device, it’s an old GPS bluetooth adaptor that I purchased years ago to use with my ancient SPV Smartphone (I was an early adopter).
I recently purchased a few LCD displays from ebay, these were labelled up as Hitachi LM038 LCD Modules. There didn’t seem to be much information out there on the internet about how to use these, so I thought i’d put together a quick how to guide for anyone else who may have purcased one of these. In the example i’m using an Arduino (Atmel ATMega328) for speed and ease of use, however the process would be the same for any micro (PIC or AVR).
I’m pleased to say that the 5B4AGN Band Pass filters are now complete, enjoy the photo’s
During the build of the Band Pass Filters it has become obvious that my little miniVNA is just not up to the job. Because of this (after some advice from Bob 5B4AGN) i will be embarking on building one of these
Construction of the band pass filters continued today, progress has been slow recently as i needed some more parts (M3 10mm bolts and some M3 nuts), I also had the problem of finding some appropriate coax to use for the internal connections. As luck would have it i have a couple of barely working Wifi antennas that have some nice long leads of very thin coax, it turns out that the coax is RG-174, perfect for my short internal connections on the BPF’s.
My large 7 segment displays have arrived, these are 2.24″ tall and will be eventually be used in couple of large band readouts for the M0XXT contest station.
They are yellow and of the common anode variety. Should look pretty nice once the project is finished. If anyone knows of a suitable enclosure to hold 3 of these plus associated circuitry please let me know.
For CQ WPX this year i built two sets of high power coax stub filters to allow the M0XXT team to enter as Multi-Single.
These stubs performed reasonably, although there are some improvements i plan on making for the final design to be used in conjunction with the Band Pass Filters already under construction.
Expect a full article on the coax filters soon.
(P.S. Fitting over 80 PL-259’s is not fun)
I started construction of the first of two automatic band pass filters tonight. These will be used in the M0XXT contest station in conjunction with high power stub filters to allow us to run a proper Multi-Single or Multi-Two station.
These are similar to the Dunestar 600 devices, however they use the W3NQN filter design so the performance is superior to the Dunestar’s. They were designed by Bob Henderson 5B4AGN, who had some professional boards and cases made up.
They employ a very clever motherboard system, so the filters can be removed/replaced easily.
The photo is of the first, nearly complete motherboard
Progress on the band pass filters is progressing nicely, the second motherboard is almost complete and winding of the coils for the first set of filters has begun. Hopefully I should be starting on tuning the filters shortly.
Here is a quick pic of the L1 winding for 40m