What Is RFS, Inc.? An Office Buyer’s Guide to the RFS File System and RF Orders

First, a quick disclaimer: I’m not an RF engineer. I’m the office administrator for a 60-person engineering firm, and I manage our comms equipment purchasing—roughly $250,000 per year across 15 vendors. I report to both operations and finance, so I get to hear it from both sides. I took over this role in 2020 knowing nothing about RF. Since then, I’ve ordered my share of RFS antennas, cellflex cables, filters, and RET controllers. I’ve also made mistakes that cost time and money. This FAQ is the version I wish I’d had at the start.

Here’s what we’ll cover:

• What RFS Inc actually sells
• What the RFS file system is and why it matters
• Why part numbers like 3310 and revisions like 7.1 are worth checking
• What to check before you place your first PO
• Why the Klein vs multimeter question shows up in our shop
• Why preventing a mistake beats returning a big cable assembly

1. What Is RFS Inc, and Why Do Engineers Care?

RFS stands for Radio Frequency Systems. The company makes RF antennas, coaxial cables, leaky feeder cables, cellflex cables, filters, dehydrators, RET controllers, GDTs, and smart communication systems. You’ll find that equipment on cell towers, in tunnels, subways, stadiums, and industrial networks. If your team maintains a cellular or private radio network, RFS is one of the first names an engineer will write down.

One thing that tripped me up: RFS Inc is the legal entity on invoices and contracts in North America. On the website, it’s usually just “RFS.” When I set up a vendor number, I needed the full legal name for our finance department. I’m in the U.S., so my experience is with RFS Inc. If you’re buying from another region, the legal entity will be different—worth confirming before you create the PO.

2. What Is the RFS File System?

When I first heard “RFS file system,” I thought of the old Unix remote file system concept from decades ago. That’s not what I mean here. In the RFS world, the RFS file system is how the company organizes product documentation online. Spec sheets, mechanical drawings, installation manuals, and test reports are filed by product family and model.

When I first logged in, it wasn’t obvious. There’s no “download everything” button. You need the product family or model number to get anywhere. Why does this matter? Because two RFS parts can look almost identical on paper but have different connectors, frequency ranges, or test tolerances. The file system lets you pull the exact datasheet and confirm the current revision before you commit. For a non-engineer, that is a superpower. It keeps “I think this is right” from becoming “we ordered the wrong one.”

3. Why Do Part Numbers Like 3310 and Revisions Like 7.1 Matter?

Let me give you a concrete example. One of our recurring orders is an RFS filter whose part number starts with 3310. The number seems simple, but the 3310 family has variants—different frequency bands, connector types, and mechanical profiles. If you write “3310” on a PO without the dash number, you’re basically asking the warehouse to guess. A part number is not a description.

On the current datasheet, the revision is 7.1. The previous project used revision 6.x, and the connector didn’t change, but the internal tuning and test data did. So glad I checked before we ordered 20 units. Actually, 24 with spares. I had the PO ready to send, then noticed the revision had moved. Ten minutes on the RFS file system saved us from buying outdated stock that an engineer would have rejected on site.

Period. That’s the whole reason I’m a fan of checklists.

4. What Should I Check Before Placing an RFS Order?

Why a checklist? Because a 5-minute verification is the cheapest insurance you’ll buy. This is my version, adapted for an office buyer:

• Exact manufacturer part number. Include dash numbers. No guessing.
• Latest revision. Look for the current version on the spec sheet—like 7.1—not the one from last year.
• Connector, cable length, and frequency band. Even if you’re not an engineer, your engineer can write these down in the request. Ask them to put it in an email.
• Lead time and stock status. A good price doesn’t help if delivery misses the site date.
• Invoice format. This might sound weird, but I got burned in 2021 when a vendor sent a handwritten receipt. Finance rejected it. Now I verify invoicing capability before any PO—especially for a new vendor.
• Shipping method. If you need a small adapter or jumper, USPS First-Class Mail large envelope service is $1.50 for the first ounce as of January 2025 (usps.com). Overnight freight for a connector that fits in a flat envelope is overkill.

Restocking fees alone can make a wrong order painful, and that’s before you count the delay. Also: if a salesperson claims a product will cover “any environment,” ask for the datasheet. Per FTC advertising guidance, claims need to be truthful and substantiated (ftc.gov). You don’t need to quote the rule—just asking for the test data often ends the conversation.

5. Klein vs Multimeter: Which One Do You Need?

This search phrase followed me around for weeks. People ask “Klein vs multimeter” as if they’re two different products. The short answer: Klein makes multimeters, among many other tools. Our field techs carry Klein meters because they survive drops. But brand only matters if the meter is calibrated and used for the right test. Calibration matters more than the logo.

For basic continuity checks on RFS cables and connectors, a multimeter is fine. If you’re validating insertion loss or VSWR on a feeder, you need a cable analyzer. Or rather, the multimeter tells you whether there’s a circuit; the analyzer tells you whether it’s a good RF circuit. Two different questions.

So don’t get stuck on “Klein vs multimeter.” Get a meter from a reputable brand, have it calibrated, and understand what it can and can’t tell you. Our team’s answer is Klein. Yours might be different. And that’s okay.

6. Should You Buy RFS Direct or Through a Distributor?

I have mixed feelings about this one. On one hand, ordering direct from RFS Inc gives you direct access to the RFS file system and factory support. On the other hand, distributors sometimes have better lead times and can bundle shipping for multiple vendors. We keep both: direct for complex, engineered orders, and a distributor for quick reorders of standard cable and connectors.

One caveat: get the quoting engineer on the phone before you compare prices. Distributors are helpful, but nobody knows the product like the factory. What worked for us as a mid-size company might not work for a smaller operation. If you’re buying once a year, a distributor will probably be less painful. If you’re planning a large rollout, go direct and get the factory support in the loop early.

7. How Much Lead Time Should You Plan For?

I plan at least four to six weeks for RFS cable and antenna orders. In 2024, a filter order took eight weeks because the factory was more backed up than projected. Actually, the first email said six weeks, then it slipped two. If you wait until a site visit is on the calendar, you’re already late.

The RFS sales team is responsive, but they can’t fix a site schedule. Every quarter, I check the lead times for our recurring items. That way I can warn the engineering team before they promise a project date. It’s not a perfect system, but it beats the alternative: standing in front of my VP explaining why the part isn’t here.

8. Why Is Prevention Better Than a Return?

Because the most expensive equipment is the one that arrives wrong and stops the project. A return costs freight, restocking fees, and engineering time. The few minutes I spend checking part numbers and revisions cost almost nothing.

I don’t trust my memory, and neither should you. The RFS file system, a part number like 3310, a revision like 7.1—these are not arcane details. They are the difference between a smooth month and a month of phone calls.

I keep a printed copy of my checklist on my desk. It’s not pretty. It works. 5 minutes of verification beats 5 days of correction. That’s it. Done.