slowmover
Active Member
Corrections made several times now.
I’ve been looking for the 71’ SIRIO replacement whip for my pair of 5K-3/8. (Not in stock). Haven’t found other.
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NMO34 with the W640 (64" whip) vs NMO-27 vs CWB-27
- Thread starter RFI-EMI-GUY
- Start date
I’ve been looking for the 71’ SIRIO replacement whip for my pair of 5K-3/8. (Not in stock). Haven’t found other.
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Ok thanks.
slowmover
Active Member
@mmckenna will the base take a .125 without drilling do you happen to know? Also what about the spring? DX has these but they're .125 according to specs.
www.dxengineering.com
DX Engineering DXE-RODZ-72P DX Engineering Hot Rodz™ Capacity Hat Rods | DX Engineering
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slowmover
Active Member
@mmckenna will the base take a .125 without drilling do you happen to know? Also what about the spring? DX has these but they're .125 according to specs.
DX Engineering DXE-RODZ-72P DX Engineering Hot Rodz™ Capacity Hat Rods | DX Engineering
Free Shipping - DX Engineering Hot Rodz™ Capacity Hat Rods with qualifying orders of $99. Shop Mobile Antenna Capacity Hat Rods at DX Engineering.
Post in thread 'NMO34 with the W640 (64" whip) vs NMO-27 vs CWB-27'
NMO34 with the W640 (64" whip) vs NMO-27 vs CWB-27
http://forums.radioreference.com/th...-whip-vs-nmo-27-vs-cwb-27.480630/post-4190863
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Yes I read that. I believe the standard one is .100, my question was "would I need to drill it to accommodate the .125?" I understand it can be drilled, I was asking if I would need to or not. Also I don't think drilling on the spring has been discussed. Again, will the standard .100 size accommodate the .125 without drilling?
mmckenna
I ♥ Ø
Never had a reason to try. I'm on the road the rest of the week and won't be able to check. My gut feeling is that it will not. It's purposely a snug fit with the whip so it stays in place and there's not a gap for crud to accumulate.
The whip does not attach to the spring in any way. The cone screws on to the top of the spring and the spring screws on top of the coil.
DX Engineering DXE-RODZ-72P DX Engineering Hot Rodz™ Capacity Hat Rods | DX Engineering
Free Shipping - DX Engineering Hot Rodz™ Capacity Hat Rods with qualifying orders of $99. Shop Mobile Antenna Capacity Hat Rods at DX Engineering.
slowmover
Active Member
Got it.
I’d drill, but OTOH, those DX-E pieces appear to be rigid; are without the flex I’d want for a whip.
My 13’ TTL height base-load antenna whip hits obstructions on a somewhat regular basis (no spring). PRESIDENT has/had a video where the Texas 1800 antenna can take 100-MPH strikes without marks, much less damage. My confirming experience thus far is at 60-MPH and lower.
Plenty of half-asleep truck drivers will run up near obstacles with mirror mount antennas and bend them a foot or less from tip (WILSON, etc). I understand that use of a hatchet to straighten them is a method.
I’ve only bent one whip and chose to replace it. The old whip became a fishing tool for lost items.
Why not just the W640 whip?
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I’d drill, but OTOH, those DX-E pieces appear to be rigid; are without the flex I’d want for a whip.
My 13’ TTL height base-load antenna whip hits obstructions on a somewhat regular basis (no spring). PRESIDENT has/had a video where the Texas 1800 antenna can take 100-MPH strikes without marks, much less damage. My confirming experience thus far is at 60-MPH and lower.
Plenty of half-asleep truck drivers will run up near obstacles with mirror mount antennas and bend them a foot or less from tip (WILSON, etc). I understand that use of a hatchet to straighten them is a method.
I’ve only bent one whip and chose to replace it. The old whip became a fishing tool for lost items.
Why not just the W640 whip?
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Duh, thank you, I'm not sure what I was thinking there. You're most likely correct, about the fit, I know on most the brands, it's a pretty snug fit.
We've ascertained the W640 is 64 inches long, we've also ascertained by several posts from actual tests, it's resonant around 29 MHz. While occasionally I get up around the 10 meter repeater range, it's rare any more these days while mobile.
You're likely correct about them being rigid. Frankly they're cheap enough and for testing to see if the NMO 34 would come down to the CB band, honestly it's been the only smaller diameter "whip type thing" I could find that might even work for testing.
I've bent some up being pretty awake back when I drove. I liked height too... Never tried a hatchet to straighten one however, I left trucking in late 92 and things have changed a lot since then. I did however have guys come into the shop after that and we straightened out a few here and there using various means. Usually they just chose to get a new one of which I always had plenty in stock but I honestly can't remember having a whip 6 foot to use in a coil loaded antenna.
mmckenna
I ♥ Ø
Had to think on this.
The "QCone", in Larsen part naming convention, comes in 3 different sizes. The NMO27, as well as the NMO30, etc. are designed to use the 0.100 diameter whips. The hole in the cone is 0.100.
So, if you wanted to use one of those hammy whips, you'd either need to drill it out, or order the correct one from Larsen.
The part numbers are:
QCone.125 for the chrome version
QCone.125B for the black version.
Some of the antenna models do use a thicker whip, but not the low band products. Those tend to want the thinner whip for flexibility. The 0.125" whips are used on the wideband VHF antennas, as well as some of the 800MHz products.
Thanks. I appreciate it. I need to look I think I have a couple of Larsen mono band antenna coils out in the garage, maybe they'll have the right one.
mmckenna
I ♥ Ø
NMOQWB (quarter wave wide band) antennas had the 0.125 whip, as did the colinear 800MHz antennas.
slowmover
Active Member
Larsen NMO30
Larsen spring
64” whip
Trimmed for CB the overall length is 62.5”
(TTL Antenna Height)
From:
Post in thread 'NMO34 with the W640 (64" whip) vs NMO-27 vs CWB-27'
NMO34 with the W640 (64" whip) vs NMO-27 vs CWB-27
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Larsen spring
64” whip
Trimmed for CB the overall length is 62.5”
(TTL Antenna Height)
From:
Post in thread 'NMO34 with the W640 (64" whip) vs NMO-27 vs CWB-27'
NMO34 with the W640 (64" whip) vs NMO-27 vs CWB-27
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Yes....this post was about the NMO 34 however. (note the title). Also not to be rude but I'll usually not take any readings that are from a radio built in SWR meter athough I've seen them to be quite accurate for what they are but a SWR or 1.1 at one place and 1.2 at another place doesn't really show the curve. Was it resonant on CH 1 and then slightly went up on 40? Was it resonant closer to ch 1 and then dipped on ch 20 and slightly higher on 40? I dunno, doesn't say. Even on a MFJ analyzer like the 259 you can spin the dial and see the dip.
I will however accept this as valid.
NMO34 with the W640 (64" whip) vs NMO-27 vs CWB-27
This is what the CWB27 is for, below CB to the top end of 10m with no tuning. It’s got more than just a loading coil in the base. Can you still even get this antenna? The genuine one ?
In this post he shows the curve and answered that there was no spring and the whip was all the way up. Those are the kind of posts that matter. Obviously it will depend on mounting, vehicle and etc. But it's a start. I'm not interested at the moment about the NMO 30, posts prove that work on the CB band.
Honestly for what I want, I don't want it centered in the CB band BUT, I will see what I can achieve there for the CB only crowd. I'd prefer the dip somewhat higher with usable (under 2:1 or even slightly less) in the CB band and usable up until at least say 28.700 or so to encompass some of the 10 meter SSB portion of the band. I think to me this is more about seeing if the bandwidth will be better with less coil/ longer whip. (which yes it should be I'd think) and not having go use a 102 inch whip to try and get that done.
I've done it with the Wilson 1k and 5k (better results on the 5K) and just would like to see how the NMO 34 stacks up to that.
Frankly the NMO 30 looks like I would come close for what I want and I'd way prefer that to the "newer model" Wilsons, I don't think they're what they used to be. I can likely repo my two Wilsons from the friends that borrowed them but hey, what fun is that. Won't find much new there. Besides I think that NMO mount will look more in place on my retired police interceptor.
That's what was missing from this dude's retired police car also....Besides I think that NMO mount will look more in place on my retired police interceptor.
If you're ever out playing and in the mood, I'd love to see the same curve with the whip all the way down. I'm looking for a little higher usable frequency range with the bottom of the CB band coming in right at or slightly under 2:1 or even CH 19 right at that mark. Just a thought.
EDIT: I may have read your post wrong where you described it. it is all the way "down" and bottomed out on the coil?
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LOL that's Great! "the use of deadly force has been approved!"
