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<blockquote data-quote="s-band" data-source="post: 1007330" data-attributes="member: 407744">The MOTODRV chips are PLDs interfacing between the 82C55 peripheral interface &amp; processor to the motor drive. No idea what the difference is, maybe a close spec comparison may help. By the date codes, your A is 1997 vintage compared to BM's &amp; mine which are 2006ish so, unless it's been changed, they are not later versions of PLD. Your A has a different version of the smaller PLD, RC2KH on mine vs. RC2KE on yours. Difficult to know if that is due to age or processor firmware version.The extra board is an RC2KHPP high current rotating feed driver (page 115 of V1.4 manual).&nbsp; You only need something like this <a href="https://www.avcomm.com.au/shop/feedhorns/c-ku-motorised-feedhorn/" target="_blank">4 Port C and Ku Band Motorised Feedhorn | Av-Comm</a> to make use of it;-) I think that board can be used in any version and is enabled by the normal menus (I have the option in my X)Has anyone tried the &quot;Expert Access&quot; code printed in the manual (page 81)? Mine has the access bit set so is unlocked. I'm not tempted in case I lock it. Is it the same code for all RC2K with any firmware?</blockquote>

[QUOTE="s-band, post: 1007330, member: 407744"] The MOTODRV chips are PLDs interfacing between the 82C55 peripheral interface & processor to the motor drive. No idea what the difference is, maybe a close spec comparison may help. By the date codes, your A is 1997 vintage compared to BM's & mine which are 2006ish so, unless it's been changed, they are not later versions of PLD. Your A has a different version of the smaller PLD, RC2KH on mine vs. RC2KE on yours. Difficult to know if that is due to age or processor firmware version. The extra board is an RC2KHPP high current rotating feed driver (page 115 of V1.4 manual). You only need something like this [URL='https://www.avcomm.com.au/shop/feedhorns/c-ku-motorised-feedhorn/']4 Port C and Ku Band Motorised Feedhorn | Av-Comm[/URL] to make use of it;-) I think that board can be used in any version and is enabled by the normal menus (I have the option in my X) Has anyone tried the "Expert Access" code printed in the manual (page 81)? Mine has the access bit set so is unlocked. I'm not tempted in case I lock it. Is it the same code for all RC2K with any firmware? [/QUOTE]

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