Good afternoon to you. I am a Central Govt Class 1 Gazetted Officer retired and currently serving as VP (Admin) and enjoying my work as well as when I was in Govt service. I have done both HR, Admin and ER related works all my life and can assure you that if you take on both the jobs you will be much more experienced rather than getting slotted in only HR. I can quote you that I had worked in DRDO for six years as manager security, safety and fire fighting and a qualified labour lawyer (MLL&LW), satellite imagery expert, Computer qualified (Diploma from NIIT Pune) and a fighting soldier for 36+ years in Indian Army. I can only suggest you that if you feel right go ahead and accept new assignment and look for more qualifications so that your horizon is broadened for bigger roles. Nothing will stop you from doing both admin and HR jobs with the same zeal, if you wish to.
Suggestions to you for better outlook of life:
(a) Don't get categorized so early in your carrier.
(b) Look for opportunities to broaden your educational base for making wider choises in life.
(c) Don't stop further education as it will help you only to progress.
(d) Be a very positive man to look up at life and go ahead with progressive prospects.
With warm wishes
28th July 2013 From India, Pune
You fear are correct. Do not Jump in Administration. Admin needs full focus and with its come thanks job satisfaction, which will impact your focus on HR in early state of your career.
Continue your career as HR and focus on more verticals in HR for atleat 5yrs downline.
Wish you Good luck.
28th July 2013 From Saudi Arabia, Riyadh
30th July 2013 From India, Bangalore