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RAMI vs. Delta Pop VHF Antenna's
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Lessons-learned submissions follow a standardized format designed to identify the issue, draw out the relevant factors and present useful guidance to others facing a similar situation. The submitter answers the following 5 questions:
1) What went wrong (or right), and why?
2) What were the shortcomings, and why did they exist?
3) What actions were taken to fix the problem?
4) What preventive actions should be taken into account for future efforts?
5) What overall recommendations should be made for future projects?
The length of the write-up and amount of detail presented are left up to each individual. Some lessons learned can be perfectly conveyed in a few simple sentences, while others will require much more. The goal is to be as clear and succinct as possible, not to generate literary masterpieces!
All posts submitted to this forum are held in a review queue for approval by a moderator. Information in the posts will be reviewed, vetted, and modified as needed before going public. Additionally, any replies that are submitted would also be reviewed to ensure they add value and remain on topic. This will avoid normal threat drift of general discussions.
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RAMI vs. Delta Pop VHF Antenna's
by WilliamBatten » Tue Oct 01, 2024 12:49 pm
I've always been told that RAMI antennas were hard to beat. Unfortunately, that was not my experience this time. I purchased the RAMI VHF antenna from Spruce - took care in the mounting - but was unable to get acceptable SWR readings. I took measurements with the antenna just out of the box - and it seemed to be tuned for the low end of the frequency spectrum. I began shortening the antenna - but was never able to get readings under and SWR of 2.0.
A fellow Sonex builder had just upgraded his VHF antenna to a Delta Pop - and was very happy with the results. So, I spent the extra money and ordered one from MGL - along with the RG-400 coax. Now all of my readings are 1.75 or below and the antenna is tuned for the center of the VHF spectrum - see attached spreadsheet.
A fellow Sonex builder had just upgraded his VHF antenna to a Delta Pop - and was very happy with the results. So, I spent the extra money and ordered one from MGL - along with the RG-400 coax. Now all of my readings are 1.75 or below and the antenna is tuned for the center of the VHF spectrum - see attached spreadsheet.
- Attachments
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SWR Readings.pdf- (33.01 KiB) Downloaded 19 times
Bill
N67WX - Reserved
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Waiex-B Taildragger
Jabiru 3300
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WilliamBatten - Posts: 34
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