[amsat-bb] Sequencer advice needed

[Roger - W7TZ]

I've used the W6PQL (built and tested) unit for 6m and 1.25m very
successfully for several years.

73, Roger
W7TZ
CN83ia


On Fri, Mar 6, 2020 at 4:26 AM Hans BX2ABT via AMSAT-BB <amsat-bb at amsat.org>
wrote:

> I haven't worked with sequencers before as all my LNAs and SDRs have
> been used for receive only. But now that I have a Airspy HF+ I want to
> get going with APRS on 145.825 and use this on HF as well. So receiving
> with the SDR, transmitting with a transceiver. I also want to experiment
> with LNAs, so another reason to use a sequencer. I did a lot of
> googling, learned some, but still not sure what I need to look out for
> when buying one. I prefer a kit or assembled product as a first try.
>
> Below is a list of what I found on line. From a distance the VHF Design
> is cheap and has detailed information, so I am leaning towards
> purchasing that. Later, for a DIY project, I like the OZ1BXM design
> because it uses an Arduino for control, which brings some flexiblity.
>
> Can you all please give me some input on what to look for in sequencers
> or comment on the choices below? Any other kits/assemblies I have missed
> and should be considered? Cheers,
>
> Hans
> BX2ABT
>
>
>
> Minikits from Austalia's EME166: AU$45 (=US$27.75)
>
> https://www.minikits.com.au/Sequencer?search=Sequencer
>
> This is the only one that indicates a frequency range: 28 to 500 MHz, so
> this will cover the 2m band, but not HF. Also RF input is 4 Watts
> maximum, which seems low, so how is this usable?
>
>
>
> W6PQL's sequencer (US$20 for kit, US$37.50 assembled)
>
> http://www.w6pql.com/relay_sequencer.htm
>
> No info on frequency range or input power. Not much info on the website.
>
>
>
> VHF Design (US$20 assembled)
>
> https://vhfdesign.com/other/sequencer-pcb.html
>
> Website has good information, diagrams and PCB layouts. Again no info on
> frequency range, etc.
>
>
>
> Downeast Microwave (US$25~80)
>
>
> https://www.downeastmicrowave.com/searchresults.asp?Search=sequencer&Submit=
>
> 3 and 4 step sequencers both in solid state and with relays based on a
> design by W5LUA. Which better: solid state or relays? Little indept info.
>
>
>
> G3SEK - (DIY)
>
> http://www.ifwtech.co.uk/g3sek/dx-book/sequencer/
>
> Basically only a schematic, so need to build it from the ground up.
>
>
>
> OZ1BXM (DIY)
>
> http://oz1bxm.dk/seq/sequencer.html
>
> Another DIY project based on the W6PLQ design. This uses an Arduino as
> MCU, so should be flexible. No kits and no PCB designs.
>
>
>
> SM2CEW (DIY)
>
> http://sm2cew.com/sequencer/sequencer.html
>
> This one looks very simple to make with very few components. It was
> designed for HF, so will it work on VHF?
>
>
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